CENTURY ALUMINUM SEBREE LLC has sponsored the creation of one or more 401k plans.
Submission information for form 5500 for 401k plan CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN
| Measure | Date | Value |
|---|
| 2022: CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2022 401k membership |
|---|
| Market value of plan assets | 2022-12-31 | 95,304,364 |
| Acturial value of plan assets | 2022-12-31 | 90,193,294 |
| Funding target for retired participants and beneficiaries receiving payment | 2022-12-31 | 58,274,002 |
| Number of terminated vested participants | 2022-12-31 | 126 |
| Fundng target for terminated vested participants | 2022-12-31 | 2,584,450 |
| Active participant vested funding target | 2022-12-31 | 14,203,188 |
| Number of active participants | 2022-12-31 | 533 |
| Total funding liabilities for active participants | 2022-12-31 | 15,670,969 |
| Total participant count | 2022-12-31 | 1,124 |
| Total funding target for all participants | 2022-12-31 | 76,529,421 |
| Balance at beginning of prior year after applicable adjustments | 2022-12-31 | 0 |
| Prefunding balance at beginning of prior year after applicable adjustments | 2022-12-31 | 5,349,610 |
| Prefunding balanced used to offset prior years funding requirement | 2022-12-31 | 241,575 |
| Amount remaining of carryover balance | 2022-12-31 | 0 |
| Amount remaining of prefunding balance | 2022-12-31 | 5,108,035 |
| Present value of excess contributions | 2022-12-31 | 0 |
| Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance | 2022-12-31 | 0 |
| Reductions in caryover balances due to elections or deemed elections | 2022-12-31 | 0 |
| Reductions in prefunding balances due to elections or deemed elections | 2022-12-31 | 0 |
| Balance of carryovers at beginning of current year | 2022-12-31 | 0 |
| Balance of prefunding at beginning of current year | 2022-12-31 | 5,654,084 |
| Total employer contributions | 2022-12-31 | 0 |
| Total employee contributions | 2022-12-31 | 0 |
| Contributions allocated toward unpaid minimum require contributions from prior years | 2022-12-31 | 0 |
| Contributions made to avoid restrictions adjusted to valuation date | 2022-12-31 | 0 |
| Contributions allocated toward minimum required contributions for current year adjusted to valuation date | 2022-12-31 | 0 |
| Liquidity shortfalls end of Q1 | 2022-12-31 | 0 |
| Liquidity shortfalls end of Q2 | 2022-12-31 | 0 |
| Liquidity shortfalls end of Q3 | 2022-12-31 | 0 |
| Liquidity shortfalls end of Q4 | 2022-12-31 | 0 |
| Unpaid minimum required contributions for all prior years | 2022-12-31 | 0 |
| iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years | 2022-12-31 | 0 |
| Remaining amount of unpaid minimum required contributions | 2022-12-31 | 0 |
| Minimum required contributions for current year target normal cost | 2022-12-31 | 1,131,348 |
| Net shortfall amortization installment of oustanding balance | 2022-12-31 | 0 |
| Waiver amortization installment | 2022-12-31 | 0 |
| Total funding amount beforereflecting carryover/prefunding balances | 2022-12-31 | 0 |
| Carryover balance elected to use to offset funding requirement | 2022-12-31 | 0 |
| Prefunding balance elected to use to offset funding requirement | 2022-12-31 | 0 |
| Additional cash requirement | 2022-12-31 | 0 |
| Contributions allocatedtoward minimum required contributions for current year | 2022-12-31 | 0 |
| Unpaid minimum required contributions for current year | 2022-12-31 | 0 |
| Unpaid minimum required contributions for all years | 2022-12-31 | 0 |
| Total participants, beginning-of-year | 2022-01-01 | 1,124 |
| Total number of active participants reported on line 7a of the Form 5500 | 2022-01-01 | 512 |
| Number of retired or separated participants receiving benefits | 2022-01-01 | 372 |
| Number of other retired or separated participants entitled to future benefits | 2022-01-01 | 126 |
| Total of all active and inactive participants | 2022-01-01 | 1,010 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2022-01-01 | 105 |
| Total participants | 2022-01-01 | 1,115 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2022-01-01 | 58 |
| 2021: CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2021 401k membership |
|---|
| Market value of plan assets | 2021-12-31 | 91,326,080 |
| Acturial value of plan assets | 2021-12-31 | 82,793,000 |
| Funding target for retired participants and beneficiaries receiving payment | 2021-12-31 | 59,685,312 |
| Number of terminated vested participants | 2021-12-31 | 117 |
| Fundng target for terminated vested participants | 2021-12-31 | 2,216,310 |
| Active participant vested funding target | 2021-12-31 | 13,300,909 |
| Number of active participants | 2021-12-31 | 486 |
| Total funding liabilities for active participants | 2021-12-31 | 14,619,157 |
| Total participant count | 2021-12-31 | 1,082 |
| Total funding target for all participants | 2021-12-31 | 76,520,779 |
| Balance at beginning of prior year after applicable adjustments | 2021-12-31 | 0 |
| Prefunding balance at beginning of prior year after applicable adjustments | 2021-12-31 | 6,478,827 |
| Prefunding balanced used to offset prior years funding requirement | 2021-12-31 | 1,829,677 |
| Amount remaining of carryover balance | 2021-12-31 | 0 |
| Amount remaining of prefunding balance | 2021-12-31 | 4,649,150 |
| Present value of excess contributions | 2021-12-31 | 0 |
| Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance | 2021-12-31 | 0 |
| Reductions in caryover balances due to elections or deemed elections | 2021-12-31 | 0 |
| Reductions in prefunding balances due to elections or deemed elections | 2021-12-31 | 167 |
| Balance of carryovers at beginning of current year | 2021-12-31 | 0 |
| Balance of prefunding at beginning of current year | 2021-12-31 | 5,349,610 |
| Total employer contributions | 2021-12-31 | 0 |
| Total employee contributions | 2021-12-31 | 0 |
| Contributions allocated toward unpaid minimum require contributions from prior years | 2021-12-31 | 0 |
| Contributions made to avoid restrictions adjusted to valuation date | 2021-12-31 | 0 |
| Contributions allocated toward minimum required contributions for current year adjusted to valuation date | 2021-12-31 | 0 |
| Liquidity shortfalls end of Q1 | 2021-12-31 | 0 |
| Liquidity shortfalls end of Q2 | 2021-12-31 | 0 |
| Liquidity shortfalls end of Q3 | 2021-12-31 | 0 |
| Liquidity shortfalls end of Q4 | 2021-12-31 | 0 |
| Unpaid minimum required contributions for all prior years | 2021-12-31 | 0 |
| iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years | 2021-12-31 | 0 |
| Remaining amount of unpaid minimum required contributions | 2021-12-31 | 0 |
| Minimum required contributions for current year target normal cost | 2021-12-31 | 1,164,186 |
| Net shortfall amortization installment of oustanding balance | 2021-12-31 | 0 |
| Waiver amortization installment | 2021-12-31 | 0 |
| Total funding amount beforereflecting carryover/prefunding balances | 2021-12-31 | 241,575 |
| Prefunding balance elected to use to offset funding requirement | 2021-12-31 | 241,742 |
| Additional cash requirement | 2021-12-31 | 0 |
| Contributions allocatedtoward minimum required contributions for current year | 2021-12-31 | 0 |
| Unpaid minimum required contributions for current year | 2021-12-31 | 0 |
| Unpaid minimum required contributions for all years | 2021-12-31 | 0 |
| Total participants, beginning-of-year | 2021-01-01 | 1,071 |
| Total number of active participants reported on line 7a of the Form 5500 | 2021-01-01 | 533 |
| Number of retired or separated participants receiving benefits | 2021-01-01 | 374 |
| Number of other retired or separated participants entitled to future benefits | 2021-01-01 | 120 |
| Total of all active and inactive participants | 2021-01-01 | 1,027 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2021-01-01 | 97 |
| Total participants | 2021-01-01 | 1,124 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2021-01-01 | 47 |
| 2020: CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2020 401k membership |
|---|
| Market value of plan assets | 2020-12-31 | 84,942,413 |
| Acturial value of plan assets | 2020-12-31 | 81,223,185 |
| Funding target for retired participants and beneficiaries receiving payment | 2020-12-31 | 58,580,186 |
| Number of terminated vested participants | 2020-12-31 | 106 |
| Fundng target for terminated vested participants | 2020-12-31 | 1,963,223 |
| Active participant vested funding target | 2020-12-31 | 14,285,237 |
| Number of active participants | 2020-12-31 | 481 |
| Total funding liabilities for active participants | 2020-12-31 | 15,432,579 |
| Total participant count | 2020-12-31 | 1,061 |
| Total funding target for all participants | 2020-12-31 | 75,975,988 |
| Balance at beginning of prior year after applicable adjustments | 2020-12-31 | 0 |
| Prefunding balance at beginning of prior year after applicable adjustments | 2020-12-31 | 8,500,444 |
| Carryover balanced portion elected for use to offset prior years funding requirement | 2020-12-31 | 0 |
| Prefunding balanced used to offset prior years funding requirement | 2020-12-31 | 3,167,637 |
| Amount remaining of carryover balance | 2020-12-31 | 0 |
| Amount remaining of prefunding balance | 2020-12-31 | 5,332,807 |
| Present value of excess contributions | 2020-12-31 | 0 |
| Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance | 2020-12-31 | 0 |
| Total available prior years excess cotributions added at beginning of current plan year to add to prefunding balance | 2020-12-31 | 0 |
| Reductions in caryover balances due to elections or deemed elections | 2020-12-31 | 0 |
| Reductions in prefunding balances due to elections or deemed elections | 2020-12-31 | 0 |
| Balance of carryovers at beginning of current year | 2020-12-31 | 0 |
| Balance of prefunding at beginning of current year | 2020-12-31 | 6,478,827 |
| Total employer contributions | 2020-12-31 | 0 |
| Total employee contributions | 2020-12-31 | 0 |
| Contributions allocated toward unpaid minimum require contributions from prior years | 2020-12-31 | 0 |
| Contributions made to avoid restrictions adjusted to valuation date | 2020-12-31 | 0 |
| Contributions allocated toward minimum required contributions for current year adjusted to valuation date | 2020-12-31 | 0 |
| Liquidity shortfalls end of Q1 | 2020-12-31 | 0 |
| Liquidity shortfalls end of Q2 | 2020-12-31 | 0 |
| Liquidity shortfalls end of Q3 | 2020-12-31 | 0 |
| Liquidity shortfalls end of Q4 | 2020-12-31 | 0 |
| Unpaid minimum required contributions for all prior years | 2020-12-31 | 0 |
| iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years | 2020-12-31 | 0 |
| Remaining amount of unpaid minimum required contributions | 2020-12-31 | 0 |
| Minimum required contributions for current year target normal cost | 2020-12-31 | 1,714,043 |
| Net shortfall amortization installment of oustanding balance | 2020-12-31 | 1,231,630 |
| Waiver amortization installment | 2020-12-31 | 0 |
| Total funding amount beforereflecting carryover/prefunding balances | 2020-12-31 | 1,829,677 |
| Prefunding balance elected to use to offset funding requirement | 2020-12-31 | 1,829,677 |
| Additional cash requirement | 2020-12-31 | 0 |
| Contributions allocatedtoward minimum required contributions for current year | 2020-12-31 | 0 |
| Unpaid minimum required contributions for current year | 2020-12-31 | 0 |
| Unpaid minimum required contributions for all years | 2020-12-31 | 0 |
| Total participants, beginning-of-year | 2020-01-01 | 1,050 |
| Total number of active participants reported on line 7a of the Form 5500 | 2020-01-01 | 486 |
| Number of retired or separated participants receiving benefits | 2020-01-01 | 384 |
| Number of other retired or separated participants entitled to future benefits | 2020-01-01 | 112 |
| Total of all active and inactive participants | 2020-01-01 | 982 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2020-01-01 | 89 |
| Total participants | 2020-01-01 | 1,071 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2020-01-01 | 35 |
| 2019: CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2019 401k membership |
|---|
| Market value of plan assets | 2019-12-31 | 75,464,754 |
| Acturial value of plan assets | 2019-12-31 | 80,326,337 |
| Funding target for retired participants and beneficiaries receiving payment | 2019-12-31 | 59,568,866 |
| Number of terminated vested participants | 2019-12-31 | 103 |
| Fundng target for terminated vested participants | 2019-12-31 | 1,906,749 |
| Active participant vested funding target | 2019-12-31 | 15,464,274 |
| Number of active participants | 2019-12-31 | 468 |
| Total funding liabilities for active participants | 2019-12-31 | 16,815,022 |
| Total participant count | 2019-12-31 | 1,037 |
| Total funding target for all participants | 2019-12-31 | 78,290,637 |
| Balance at beginning of prior year after applicable adjustments | 2019-12-31 | 0 |
| Prefunding balance at beginning of prior year after applicable adjustments | 2019-12-31 | 10,935,259 |
| Prefunding balanced used to offset prior years funding requirement | 2019-12-31 | 1,798,926 |
| Amount remaining of carryover balance | 2019-12-31 | 0 |
| Amount remaining of prefunding balance | 2019-12-31 | 9,136,333 |
| Present value of excess contributions | 2019-12-31 | 0 |
| Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance | 2019-12-31 | 0 |
| Reductions in caryover balances due to elections or deemed elections | 2019-12-31 | 0 |
| Reductions in prefunding balances due to elections or deemed elections | 2019-12-31 | 0 |
| Balance of carryovers at beginning of current year | 2019-12-31 | 0 |
| Balance of prefunding at beginning of current year | 2019-12-31 | 8,500,444 |
| Total employer contributions | 2019-12-31 | 0 |
| Total employee contributions | 2019-12-31 | 0 |
| Contributions allocated toward unpaid minimum require contributions from prior years | 2019-12-31 | 0 |
| Contributions made to avoid restrictions adjusted to valuation date | 2019-12-31 | 0 |
| Contributions allocated toward minimum required contributions for current year adjusted to valuation date | 2019-12-31 | 0 |
| Liquidity shortfalls end of Q1 | 2019-12-31 | 0 |
| Liquidity shortfalls end of Q2 | 2019-12-31 | 0 |
| Liquidity shortfalls end of Q3 | 2019-12-31 | 0 |
| Liquidity shortfalls end of Q4 | 2019-12-31 | 0 |
| Unpaid minimum required contributions for all prior years | 2019-12-31 | 0 |
| iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years | 2019-12-31 | 0 |
| Remaining amount of unpaid minimum required contributions | 2019-12-31 | 0 |
| Minimum required contributions for current year target normal cost | 2019-12-31 | 1,922,267 |
| Net shortfall amortization installment of oustanding balance | 2019-12-31 | 6,464,744 |
| Waiver amortization installment | 2019-12-31 | 0 |
| Total funding amount beforereflecting carryover/prefunding balances | 2019-12-31 | 3,166,279 |
| Prefunding balance elected to use to offset funding requirement | 2019-12-31 | 3,166,279 |
| Additional cash requirement | 2019-12-31 | 0 |
| Contributions allocatedtoward minimum required contributions for current year | 2019-12-31 | 0 |
| Unpaid minimum required contributions for current year | 2019-12-31 | 0 |
| Unpaid minimum required contributions for all years | 2019-12-31 | 0 |
| Total participants, beginning-of-year | 2019-01-01 | 1,026 |
| Total number of active participants reported on line 7a of the Form 5500 | 2019-01-01 | 481 |
| Number of retired or separated participants receiving benefits | 2019-01-01 | 381 |
| Number of other retired or separated participants entitled to future benefits | 2019-01-01 | 102 |
| Total of all active and inactive participants | 2019-01-01 | 964 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2019-01-01 | 86 |
| Total participants | 2019-01-01 | 1,050 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2019-01-01 | 42 |
| 2018: CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2018 401k membership |
|---|
| Market value of plan assets | 2018-12-31 | 87,023,129 |
| Acturial value of plan assets | 2018-12-31 | 80,971,590 |
| Funding target for retired participants and beneficiaries receiving payment | 2018-12-31 | 55,935,631 |
| Number of terminated vested participants | 2018-12-31 | 87 |
| Fundng target for terminated vested participants | 2018-12-31 | 1,748,435 |
| Active participant vested funding target | 2018-12-31 | 15,013,283 |
| Number of active participants | 2018-12-31 | 445 |
| Total funding liabilities for active participants | 2018-12-31 | 16,509,190 |
| Total participant count | 2018-12-31 | 987 |
| Total funding target for all participants | 2018-12-31 | 74,193,256 |
| Balance at beginning of prior year after applicable adjustments | 2018-12-31 | 0 |
| Prefunding balance at beginning of prior year after applicable adjustments | 2018-12-31 | 11,049,868 |
| Carryover balanced portion elected for use to offset prior years funding requirement | 2018-12-31 | 0 |
| Prefunding balanced used to offset prior years funding requirement | 2018-12-31 | 1,664,185 |
| Amount remaining of carryover balance | 2018-12-31 | 0 |
| Amount remaining of prefunding balance | 2018-12-31 | 9,385,683 |
| Present value of excess contributions | 2018-12-31 | 0 |
| Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance | 2018-12-31 | 0 |
| Balance of carryovers at beginning of current year | 2018-12-31 | 0 |
| Balance of prefunding at beginning of current year | 2018-12-31 | 10,935,259 |
| Total employer contributions | 2018-12-31 | 0 |
| Total employee contributions | 2018-12-31 | 0 |
| Contributions allocated toward unpaid minimum require contributions from prior years | 2018-12-31 | 0 |
| Contributions made to avoid restrictions adjusted to valuation date | 2018-12-31 | 0 |
| Contributions allocated toward minimum required contributions for current year adjusted to valuation date | 2018-12-31 | 0 |
| Liquidity shortfalls end of Q1 | 2018-12-31 | 0 |
| Liquidity shortfalls end of Q2 | 2018-12-31 | 0 |
| Liquidity shortfalls end of Q3 | 2018-12-31 | 0 |
| Liquidity shortfalls end of Q4 | 2018-12-31 | 0 |
| Unpaid minimum required contributions for all prior years | 2018-12-31 | 0 |
| iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years | 2018-12-31 | 0 |
| Remaining amount of unpaid minimum required contributions | 2018-12-31 | 0 |
| Minimum required contributions for current year target normal cost | 2018-12-31 | 1,025,990 |
| Net shortfall amortization installment of oustanding balance | 2018-12-31 | 4,156,925 |
| Waiver amortization installment | 2018-12-31 | 0 |
| Total funding amount beforereflecting carryover/prefunding balances | 2018-12-31 | 1,798,926 |
| Prefunding balance elected to use to offset funding requirement | 2018-12-31 | 1,798,926 |
| Additional cash requirement | 2018-12-31 | 0 |
| Contributions allocatedtoward minimum required contributions for current year | 2018-12-31 | 0 |
| Unpaid minimum required contributions for current year | 2018-12-31 | 0 |
| Unpaid minimum required contributions for all years | 2018-12-31 | 0 |
| Total participants, beginning-of-year | 2018-01-01 | 976 |
| Total number of active participants reported on line 7a of the Form 5500 | 2018-01-01 | 468 |
| Number of retired or separated participants receiving benefits | 2018-01-01 | 382 |
| Number of other retired or separated participants entitled to future benefits | 2018-01-01 | 98 |
| Total of all active and inactive participants | 2018-01-01 | 948 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2018-01-01 | 78 |
| Total participants | 2018-01-01 | 1,026 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2018-01-01 | 41 |
| 2017: CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2017 401k membership |
|---|
| Market value of plan assets | 2017-12-31 | 79,774,493 |
| Acturial value of plan assets | 2017-12-31 | 80,437,800 |
| Funding target for retired participants and beneficiaries receiving payment | 2017-12-31 | 52,654,643 |
| Number of terminated vested participants | 2017-12-31 | 89 |
| Fundng target for terminated vested participants | 2017-12-31 | 1,776,168 |
| Active participant vested funding target | 2017-12-31 | 16,310,658 |
| Number of active participants | 2017-12-31 | 433 |
| Total funding liabilities for active participants | 2017-12-31 | 18,204,290 |
| Total participant count | 2017-12-31 | 965 |
| Total funding target for all participants | 2017-12-31 | 72,635,101 |
| Balance at beginning of prior year after applicable adjustments | 2017-12-31 | 0 |
| Prefunding balance at beginning of prior year after applicable adjustments | 2017-12-31 | 11,138,353 |
| Carryover balanced portion elected for use to offset prior years funding requirement | 2017-12-31 | 0 |
| Prefunding balanced used to offset prior years funding requirement | 2017-12-31 | 1,115,797 |
| Amount remaining of carryover balance | 2017-12-31 | 0 |
| Amount remaining of prefunding balance | 2017-12-31 | 10,022,556 |
| Present value of excess contributions | 2017-12-31 | 0 |
| Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance | 2017-12-31 | 0 |
| Total available prior years excess cotributions added at beginning of current plan year to add to prefunding balance | 2017-12-31 | 0 |
| Balance of carryovers at beginning of current year | 2017-12-31 | 0 |
| Balance of prefunding at beginning of current year | 2017-12-31 | 11,049,868 |
| Total employer contributions | 2017-12-31 | 0 |
| Total employee contributions | 2017-12-31 | 0 |
| Contributions allocated toward unpaid minimum require contributions from prior years | 2017-12-31 | 0 |
| Contributions made to avoid restrictions adjusted to valuation date | 2017-12-31 | 0 |
| Contributions allocated toward minimum required contributions for current year adjusted to valuation date | 2017-12-31 | 0 |
| Liquidity shortfalls end of Q1 | 2017-12-31 | 0 |
| Liquidity shortfalls end of Q2 | 2017-12-31 | 0 |
| Liquidity shortfalls end of Q3 | 2017-12-31 | 0 |
| Liquidity shortfalls end of Q4 | 2017-12-31 | 0 |
| Unpaid minimum required contributions for all prior years | 2017-12-31 | 0 |
| iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years | 2017-12-31 | 0 |
| Remaining amount of unpaid minimum required contributions | 2017-12-31 | 0 |
| Minimum required contributions for current year target normal cost | 2017-12-31 | 1,103,454 |
| Net shortfall amortization installment of oustanding balance | 2017-12-31 | 3,247,169 |
| Waiver amortization installment | 2017-12-31 | 0 |
| Total funding amount beforereflecting carryover/prefunding balances | 2017-12-31 | 1,663,185 |
| Carryover balance elected to use to offset funding requirement | 2017-12-31 | 0 |
| Prefunding balance elected to use to offset funding requirement | 2017-12-31 | 1,664,185 |
| Additional cash requirement | 2017-12-31 | 0 |
| Contributions allocatedtoward minimum required contributions for current year | 2017-12-31 | 0 |
| Unpaid minimum required contributions for current year | 2017-12-31 | 0 |
| Unpaid minimum required contributions for all years | 2017-12-31 | 0 |
| Total participants, beginning-of-year | 2017-01-01 | 954 |
| Total number of active participants reported on line 7a of the Form 5500 | 2017-01-01 | 445 |
| Number of retired or separated participants receiving benefits | 2017-01-01 | 376 |
| Number of other retired or separated participants entitled to future benefits | 2017-01-01 | 82 |
| Total of all active and inactive participants | 2017-01-01 | 903 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2017-01-01 | 73 |
| Total participants | 2017-01-01 | 976 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2017-01-01 | 24 |
| 2016: CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2016 401k membership |
|---|
| Market value of plan assets | 2016-12-31 | 77,453,109 |
| Acturial value of plan assets | 2016-12-31 | 81,552,460 |
| Funding target for retired participants and beneficiaries receiving payment | 2016-12-31 | 51,409,259 |
| Number of terminated vested participants | 2016-12-31 | 84 |
| Fundng target for terminated vested participants | 2016-12-31 | 1,490,148 |
| Active participant vested funding target | 2016-12-31 | 17,098,594 |
| Number of active participants | 2016-12-31 | 438 |
| Total funding liabilities for active participants | 2016-12-31 | 18,878,729 |
| Total participant count | 2016-12-31 | 950 |
| Total funding target for all participants | 2016-12-31 | 71,778,136 |
| Balance at beginning of prior year after applicable adjustments | 2016-12-31 | 0 |
| Prefunding balance at beginning of prior year after applicable adjustments | 2016-12-31 | 11,676,672 |
| Prefunding balanced used to offset prior years funding requirement | 2016-12-31 | 286,598 |
| Amount remaining of carryover balance | 2016-12-31 | 0 |
| Amount remaining of prefunding balance | 2016-12-31 | 11,390,074 |
| Present value of excess contributions | 2016-12-31 | 0 |
| Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance | 2016-12-31 | 0 |
| Total available prior years excess cotributions added at beginning of current plan year to add to prefunding balance | 2016-12-31 | 0 |
| Balance of carryovers at beginning of current year | 2016-12-31 | 0 |
| Balance of prefunding at beginning of current year | 2016-12-31 | 11,138,353 |
| Total employer contributions | 2016-12-31 | 0 |
| Total employee contributions | 2016-12-31 | 0 |
| Contributions allocated toward unpaid minimum require contributions from prior years | 2016-12-31 | 0 |
| Contributions made to avoid restrictions adjusted to valuation date | 2016-12-31 | 0 |
| Contributions allocated toward minimum required contributions for current year adjusted to valuation date | 2016-12-31 | 0 |
| Unpaid minimum required contributions for all prior years | 2016-12-31 | 0 |
| iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years | 2016-12-31 | 0 |
| Remaining amount of unpaid minimum required contributions | 2016-12-31 | 0 |
| Minimum required contributions for current year target normal cost | 2016-12-31 | 890,427 |
| Net shortfall amortization installment of oustanding balance | 2016-12-31 | 1,364,029 |
| Waiver amortization installment | 2016-12-31 | 0 |
| Total funding amount beforereflecting carryover/prefunding balances | 2016-12-31 | 1,115,797 |
| Carryover balance elected to use to offset funding requirement | 2016-12-31 | 0 |
| Prefunding balance elected to use to offset funding requirement | 2016-12-31 | 1,115,797 |
| Additional cash requirement | 2016-12-31 | 0 |
| Contributions allocatedtoward minimum required contributions for current year | 2016-12-31 | 0 |
| Unpaid minimum required contributions for current year | 2016-12-31 | 0 |
| Unpaid minimum required contributions for all years | 2016-12-31 | 0 |
| Total participants, beginning-of-year | 2016-01-01 | 942 |
| Total number of active participants reported on line 7a of the Form 5500 | 2016-01-01 | 433 |
| Number of retired or separated participants receiving benefits | 2016-01-01 | 369 |
| Number of other retired or separated participants entitled to future benefits | 2016-01-01 | 84 |
| Total of all active and inactive participants | 2016-01-01 | 886 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2016-01-01 | 68 |
| Total participants | 2016-01-01 | 954 |
| Number of participants with account balances | 2016-01-01 | 0 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2016-01-01 | 42 |
| 2015: CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2015 401k membership |
|---|
| Total participants, beginning-of-year | 2015-01-01 | 980 |
| Total number of active participants reported on line 7a of the Form 5500 | 2015-01-01 | 438 |
| Number of retired or separated participants receiving benefits | 2015-01-01 | 365 |
| Number of other retired or separated participants entitled to future benefits | 2015-01-01 | 78 |
| Total of all active and inactive participants | 2015-01-01 | 881 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2015-01-01 | 61 |
| Total participants | 2015-01-01 | 942 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2015-01-01 | 45 |
| 2014: CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2014 401k membership |
|---|
| Total participants, beginning-of-year | 2014-01-01 | 967 |
| Total number of active participants reported on line 7a of the Form 5500 | 2014-01-01 | 479 |
| Number of retired or separated participants receiving benefits | 2014-01-01 | 366 |
| Number of other retired or separated participants entitled to future benefits | 2014-01-01 | 77 |
| Total of all active and inactive participants | 2014-01-01 | 922 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2014-01-01 | 58 |
| Total participants | 2014-01-01 | 980 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2014-01-01 | 22 |
| 2013: CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2013 401k membership |
|---|
| Total participants, beginning-of-year | 2013-01-01 | 893 |
| Total number of active participants reported on line 7a of the Form 5500 | 2013-01-01 | 424 |
| Number of retired or separated participants receiving benefits | 2013-01-01 | 337 |
| Number of other retired or separated participants entitled to future benefits | 2013-01-01 | 152 |
| Total of all active and inactive participants | 2013-01-01 | 913 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2013-01-01 | 54 |
| Total participants | 2013-01-01 | 967 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2013-01-01 | 23 |
| Measure | Date | Value |
|---|
| 2022 : CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2022 401k financial data |
|---|
| Total unrealized appreciation/depreciation of assets | 2022-12-31 | $0 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2022-12-31 | $0 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2022-12-31 | $0 |
| Total income from all sources (including contributions) | 2022-12-31 | $-27,036,560 |
| Total loss/gain on sale of assets | 2022-12-31 | $0 |
| Total of all expenses incurred | 2022-12-31 | $5,455,761 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2022-12-31 | $5,420,833 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2022-12-31 | $0 |
| Value of total assets at end of year | 2022-12-31 | $62,812,043 |
| Value of total assets at beginning of year | 2022-12-31 | $95,304,364 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2022-12-31 | $34,928 |
| Total interest from all sources | 2022-12-31 | $0 |
| Total dividends received (eg from common stock, registered investment company shares) | 2022-12-31 | $0 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2022-12-31 | No |
| Administrative expenses professional fees incurred | 2022-12-31 | $34,928 |
| Was this plan covered by a fidelity bond | 2022-12-31 | Yes |
| Value of fidelity bond cover | 2022-12-31 | $5,000,000 |
| Were there any nonexempt tranactions with any party-in-interest | 2022-12-31 | No |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2022-12-31 | No |
| Value of net income/loss | 2022-12-31 | $-32,492,321 |
| Value of net assets at end of year (total assets less liabilities) | 2022-12-31 | $62,812,043 |
| Value of net assets at beginning of year (total assets less liabilities) | 2022-12-31 | $95,304,364 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2022-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2022-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2022-12-31 | No |
| Value of interest in master investment trust accounts at end of year | 2022-12-31 | $62,812,043 |
| Value of interest in master investment trust accounts at beginning of year | 2022-12-31 | $95,304,364 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2022-12-31 | No |
| Was there a failure to transmit to the plan any participant contributions | 2022-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2022-12-31 | No |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2022-12-31 | $5,420,833 |
| Did the plan have assets held for investment | 2022-12-31 | No |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2022-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2022-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2022-12-31 | Unqualified |
| Accountancy firm name | 2022-12-31 | PLANTE & MORAN, PLLC |
| Accountancy firm EIN | 2022-12-31 | 381357951 |
| 2021 : CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2021 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2021-12-31 | $2,208,719 |
| Total unrealized appreciation/depreciation of assets | 2021-12-31 | $2,208,719 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2021-12-31 | $0 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2021-12-31 | $52,372 |
| Total income from all sources (including contributions) | 2021-12-31 | $9,264,638 |
| Total loss/gain on sale of assets | 2021-12-31 | $134,229 |
| Total of all expenses incurred | 2021-12-31 | $5,233,982 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2021-12-31 | $5,021,398 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2021-12-31 | $0 |
| Value of total assets at end of year | 2021-12-31 | $95,304,364 |
| Value of total assets at beginning of year | 2021-12-31 | $91,326,080 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2021-12-31 | $212,584 |
| Total interest from all sources | 2021-12-31 | $0 |
| Total dividends received (eg from common stock, registered investment company shares) | 2021-12-31 | $777,684 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2021-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2021-12-31 | $777,684 |
| Administrative expenses professional fees incurred | 2021-12-31 | $32,300 |
| Was this plan covered by a fidelity bond | 2021-12-31 | Yes |
| Value of fidelity bond cover | 2021-12-31 | $5,000,000 |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2021-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2021-12-31 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2021-12-31 | $0 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2021-12-31 | $84,736 |
| Administrative expenses (other) incurred | 2021-12-31 | $13,291 |
| Liabilities. Value of operating payables at end of year | 2021-12-31 | $0 |
| Liabilities. Value of operating payables at beginning of year | 2021-12-31 | $52,372 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2021-12-31 | No |
| Value of net income/loss | 2021-12-31 | $4,030,656 |
| Value of net assets at end of year (total assets less liabilities) | 2021-12-31 | $95,304,364 |
| Value of net assets at beginning of year (total assets less liabilities) | 2021-12-31 | $91,273,708 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2021-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2021-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2021-12-31 | No |
| Investment advisory and management fees | 2021-12-31 | $140,862 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2021-12-31 | $0 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2021-12-31 | $87,658,821 |
| Value of interest in master investment trust accounts at end of year | 2021-12-31 | $95,304,364 |
| Value of interest in master investment trust accounts at beginning of year | 2021-12-31 | $0 |
| Asset value of US Government securities at end of year | 2021-12-31 | $0 |
| Asset value of US Government securities at beginning of year | 2021-12-31 | $3,582,523 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2021-12-31 | $4,159,339 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2021-12-31 | Yes |
| Was there a failure to transmit to the plan any participant contributions | 2021-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2021-12-31 | No |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2021-12-31 | $5,021,398 |
| Contract administrator fees | 2021-12-31 | $26,131 |
| Did the plan have assets held for investment | 2021-12-31 | No |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2021-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2021-12-31 | No |
| Aggregate proceeds on sale of assets | 2021-12-31 | $20,999,080 |
| Aggregate carrying amount (costs) on sale of assets | 2021-12-31 | $20,864,851 |
| Opinion of an independent qualified public accountant for this plan | 2021-12-31 | Unqualified |
| Accountancy firm name | 2021-12-31 | PLANTE & MORAN, PLLC |
| Accountancy firm EIN | 2021-12-31 | 381357951 |
| 2020 : CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2020 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2020-12-31 | $341,454 |
| Total unrealized appreciation/depreciation of assets | 2020-12-31 | $341,454 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2020-12-31 | $52,372 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2020-12-31 | $52,824 |
| Total income from all sources (including contributions) | 2020-12-31 | $12,364,222 |
| Total loss/gain on sale of assets | 2020-12-31 | $666,832 |
| Total of all expenses incurred | 2020-12-31 | $5,980,106 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2020-12-31 | $5,424,404 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2020-12-31 | $0 |
| Value of total assets at end of year | 2020-12-31 | $91,326,080 |
| Value of total assets at beginning of year | 2020-12-31 | $84,942,416 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2020-12-31 | $555,702 |
| Total interest from all sources | 2020-12-31 | $0 |
| Total dividends received (eg from common stock, registered investment company shares) | 2020-12-31 | $2,022,753 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2020-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2020-12-31 | $2,022,753 |
| Administrative expenses professional fees incurred | 2020-12-31 | $54,325 |
| Was this plan covered by a fidelity bond | 2020-12-31 | Yes |
| Value of fidelity bond cover | 2020-12-31 | $5,000,000 |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2020-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2020-12-31 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2020-12-31 | $84,736 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2020-12-31 | $100,011 |
| Administrative expenses (other) incurred | 2020-12-31 | $288,611 |
| Liabilities. Value of operating payables at end of year | 2020-12-31 | $52,372 |
| Liabilities. Value of operating payables at beginning of year | 2020-12-31 | $52,824 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2020-12-31 | No |
| Value of net income/loss | 2020-12-31 | $6,384,116 |
| Value of net assets at end of year (total assets less liabilities) | 2020-12-31 | $91,273,708 |
| Value of net assets at beginning of year (total assets less liabilities) | 2020-12-31 | $84,889,592 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2020-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2020-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2020-12-31 | No |
| Investment advisory and management fees | 2020-12-31 | $184,136 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2020-12-31 | $87,658,821 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2020-12-31 | $79,345,380 |
| Asset value of US Government securities at end of year | 2020-12-31 | $3,582,523 |
| Asset value of US Government securities at beginning of year | 2020-12-31 | $5,497,025 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2020-12-31 | $9,333,183 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2020-12-31 | No |
| Was there a failure to transmit to the plan any participant contributions | 2020-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2020-12-31 | No |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2020-12-31 | $5,424,404 |
| Contract administrator fees | 2020-12-31 | $28,630 |
| Did the plan have assets held for investment | 2020-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2020-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2020-12-31 | No |
| Aggregate proceeds on sale of assets | 2020-12-31 | $10,887,395 |
| Aggregate carrying amount (costs) on sale of assets | 2020-12-31 | $10,220,563 |
| Opinion of an independent qualified public accountant for this plan | 2020-12-31 | Disclaimer |
| Accountancy firm name | 2020-12-31 | PLANTE & MORAN, PLLC |
| Accountancy firm EIN | 2020-12-31 | 381357951 |
| 2019 : CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2019 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2019-12-31 | $453,469 |
| Unrealized appreciation/depreciation of other (non real estate) assets | 2019-12-31 | $453,469 |
| Total unrealized appreciation/depreciation of assets | 2019-12-31 | $453,469 |
| Total unrealized appreciation/depreciation of assets | 2019-12-31 | $453,469 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2019-12-31 | $52,824 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2019-12-31 | $52,824 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2019-12-31 | $50,545 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2019-12-31 | $50,545 |
| Total income from all sources (including contributions) | 2019-12-31 | $15,590,977 |
| Total income from all sources (including contributions) | 2019-12-31 | $15,590,977 |
| Total loss/gain on sale of assets | 2019-12-31 | $434,369 |
| Total loss/gain on sale of assets | 2019-12-31 | $434,369 |
| Total of all expenses incurred | 2019-12-31 | $6,115,594 |
| Total of all expenses incurred | 2019-12-31 | $6,115,594 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2019-12-31 | $5,274,961 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2019-12-31 | $5,274,961 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2019-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2019-12-31 | $0 |
| Value of total assets at end of year | 2019-12-31 | $84,942,416 |
| Value of total assets at end of year | 2019-12-31 | $84,942,416 |
| Value of total assets at beginning of year | 2019-12-31 | $75,464,754 |
| Value of total assets at beginning of year | 2019-12-31 | $75,464,754 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2019-12-31 | $840,633 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2019-12-31 | $840,633 |
| Total interest from all sources | 2019-12-31 | $3 |
| Total interest from all sources | 2019-12-31 | $3 |
| Total dividends received (eg from common stock, registered investment company shares) | 2019-12-31 | $2,347,958 |
| Total dividends received (eg from common stock, registered investment company shares) | 2019-12-31 | $2,347,958 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2019-12-31 | No |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2019-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2019-12-31 | $2,347,958 |
| Total dividends received from registered investment company shares (eg mutual funds) | 2019-12-31 | $2,347,958 |
| Administrative expenses professional fees incurred | 2019-12-31 | $52,750 |
| Administrative expenses professional fees incurred | 2019-12-31 | $52,750 |
| Was this plan covered by a fidelity bond | 2019-12-31 | Yes |
| Was this plan covered by a fidelity bond | 2019-12-31 | Yes |
| Value of fidelity bond cover | 2019-12-31 | $5,000,000 |
| Value of fidelity bond cover | 2019-12-31 | $5,000,000 |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2019-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2019-12-31 | No |
| Were there any nonexempt tranactions with any party-in-interest | 2019-12-31 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2019-12-31 | $100,011 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2019-12-31 | $100,011 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2019-12-31 | $114,739 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2019-12-31 | $114,739 |
| Administrative expenses (other) incurred | 2019-12-31 | $563,672 |
| Administrative expenses (other) incurred | 2019-12-31 | $563,672 |
| Liabilities. Value of operating payables at end of year | 2019-12-31 | $52,824 |
| Liabilities. Value of operating payables at end of year | 2019-12-31 | $52,824 |
| Liabilities. Value of operating payables at beginning of year | 2019-12-31 | $50,545 |
| Liabilities. Value of operating payables at beginning of year | 2019-12-31 | $50,545 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2019-12-31 | No |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2019-12-31 | No |
| Value of net income/loss | 2019-12-31 | $9,475,383 |
| Value of net income/loss | 2019-12-31 | $9,475,383 |
| Value of net assets at end of year (total assets less liabilities) | 2019-12-31 | $84,889,592 |
| Value of net assets at end of year (total assets less liabilities) | 2019-12-31 | $84,889,592 |
| Value of net assets at beginning of year (total assets less liabilities) | 2019-12-31 | $75,414,209 |
| Value of net assets at beginning of year (total assets less liabilities) | 2019-12-31 | $75,414,209 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2019-12-31 | No |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2019-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2019-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2019-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2019-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2019-12-31 | No |
| Investment advisory and management fees | 2019-12-31 | $183,785 |
| Investment advisory and management fees | 2019-12-31 | $183,785 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2019-12-31 | $79,345,380 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2019-12-31 | $79,345,380 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2019-12-31 | $68,471,624 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2019-12-31 | $68,471,624 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2019-12-31 | $3 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2019-12-31 | $3 |
| Asset value of US Government securities at end of year | 2019-12-31 | $5,497,025 |
| Asset value of US Government securities at end of year | 2019-12-31 | $5,497,025 |
| Asset value of US Government securities at beginning of year | 2019-12-31 | $6,878,391 |
| Asset value of US Government securities at beginning of year | 2019-12-31 | $6,878,391 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2019-12-31 | $12,355,178 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2019-12-31 | $12,355,178 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2019-12-31 | No |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2019-12-31 | No |
| Was there a failure to transmit to the plan any participant contributions | 2019-12-31 | No |
| Was there a failure to transmit to the plan any participant contributions | 2019-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2019-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2019-12-31 | No |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2019-12-31 | $5,274,961 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2019-12-31 | $5,274,961 |
| Contract administrator fees | 2019-12-31 | $40,426 |
| Contract administrator fees | 2019-12-31 | $40,426 |
| Did the plan have assets held for investment | 2019-12-31 | Yes |
| Did the plan have assets held for investment | 2019-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2019-12-31 | No |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2019-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2019-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2019-12-31 | No |
| Aggregate proceeds on sale of assets | 2019-12-31 | $16,520,404 |
| Aggregate proceeds on sale of assets | 2019-12-31 | $16,520,404 |
| Aggregate carrying amount (costs) on sale of assets | 2019-12-31 | $16,086,035 |
| Aggregate carrying amount (costs) on sale of assets | 2019-12-31 | $16,086,035 |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2019-12-31 | Yes |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2019-12-31 | Yes |
| Opinion of an independent qualified public accountant for this plan | 2019-12-31 | Disclaimer |
| Opinion of an independent qualified public accountant for this plan | 2019-12-31 | Disclaimer |
| Accountancy firm name | 2019-12-31 | PLANTE & MORAN, PLLC |
| Accountancy firm name | 2019-12-31 | PLANTE & MORAN, PLLC |
| Accountancy firm EIN | 2019-12-31 | 381357951 |
| Accountancy firm EIN | 2019-12-31 | 381357951 |
| 2018 : CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2018 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2018-12-31 | $136,643 |
| Total unrealized appreciation/depreciation of assets | 2018-12-31 | $136,643 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2018-12-31 | $50,545 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2018-12-31 | $65,708 |
| Total income from all sources (including contributions) | 2018-12-31 | $-5,859,731 |
| Total loss/gain on sale of assets | 2018-12-31 | $-215,619 |
| Total of all expenses incurred | 2018-12-31 | $5,683,480 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2018-12-31 | $5,198,065 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2018-12-31 | $0 |
| Value of total assets at end of year | 2018-12-31 | $75,464,754 |
| Value of total assets at beginning of year | 2018-12-31 | $87,023,128 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2018-12-31 | $485,415 |
| Total interest from all sources | 2018-12-31 | $2 |
| Total dividends received (eg from common stock, registered investment company shares) | 2018-12-31 | $2,195,183 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2018-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2018-12-31 | $2,195,183 |
| Administrative expenses professional fees incurred | 2018-12-31 | $81,475 |
| Was this plan covered by a fidelity bond | 2018-12-31 | Yes |
| Value of fidelity bond cover | 2018-12-31 | $5,000,000 |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2018-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2018-12-31 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2018-12-31 | $114,739 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2018-12-31 | $373,926 |
| Administrative expenses (other) incurred | 2018-12-31 | $151,212 |
| Liabilities. Value of operating payables at end of year | 2018-12-31 | $50,545 |
| Liabilities. Value of operating payables at beginning of year | 2018-12-31 | $65,708 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2018-12-31 | No |
| Value of net income/loss | 2018-12-31 | $-11,543,211 |
| Value of net assets at end of year (total assets less liabilities) | 2018-12-31 | $75,414,209 |
| Value of net assets at beginning of year (total assets less liabilities) | 2018-12-31 | $86,957,420 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2018-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2018-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2018-12-31 | No |
| Investment advisory and management fees | 2018-12-31 | $221,522 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2018-12-31 | $68,471,624 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2018-12-31 | $79,761,917 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2018-12-31 | $2 |
| Asset value of US Government securities at end of year | 2018-12-31 | $6,878,391 |
| Asset value of US Government securities at beginning of year | 2018-12-31 | $6,887,285 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2018-12-31 | $-7,975,940 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2018-12-31 | No |
| Was there a failure to transmit to the plan any participant contributions | 2018-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2018-12-31 | No |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2018-12-31 | $5,198,065 |
| Contract administrator fees | 2018-12-31 | $31,206 |
| Did the plan have assets held for investment | 2018-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2018-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2018-12-31 | No |
| Aggregate proceeds on sale of assets | 2018-12-31 | $10,450,821 |
| Aggregate carrying amount (costs) on sale of assets | 2018-12-31 | $10,666,440 |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2018-12-31 | Yes |
| Opinion of an independent qualified public accountant for this plan | 2018-12-31 | Disclaimer |
| Accountancy firm name | 2018-12-31 | PLANTE & MORAN, PLLC |
| Accountancy firm EIN | 2018-12-31 | 381357951 |
| 2017 : CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2017 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2017-12-31 | $357,876 |
| Total unrealized appreciation/depreciation of assets | 2017-12-31 | $357,876 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2017-12-31 | $65,708 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2017-12-31 | $61,477 |
| Total income from all sources (including contributions) | 2017-12-31 | $12,724,654 |
| Total loss/gain on sale of assets | 2017-12-31 | $76,288 |
| Total of all expenses incurred | 2017-12-31 | $5,480,249 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2017-12-31 | $4,963,772 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2017-12-31 | $0 |
| Value of total assets at end of year | 2017-12-31 | $87,023,128 |
| Value of total assets at beginning of year | 2017-12-31 | $79,774,492 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2017-12-31 | $516,477 |
| Total interest from all sources | 2017-12-31 | $35 |
| Total dividends received (eg from common stock, registered investment company shares) | 2017-12-31 | $2,264,565 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2017-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2017-12-31 | $2,264,565 |
| Administrative expenses professional fees incurred | 2017-12-31 | $10,175 |
| Was this plan covered by a fidelity bond | 2017-12-31 | Yes |
| Value of fidelity bond cover | 2017-12-31 | $5,000,000 |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2017-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2017-12-31 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2017-12-31 | $373,926 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2017-12-31 | $108,893 |
| Administrative expenses (other) incurred | 2017-12-31 | $226,510 |
| Liabilities. Value of operating payables at end of year | 2017-12-31 | $65,708 |
| Liabilities. Value of operating payables at beginning of year | 2017-12-31 | $61,477 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2017-12-31 | No |
| Value of net income/loss | 2017-12-31 | $7,244,405 |
| Value of net assets at end of year (total assets less liabilities) | 2017-12-31 | $86,957,420 |
| Value of net assets at beginning of year (total assets less liabilities) | 2017-12-31 | $79,713,015 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2017-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2017-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2017-12-31 | No |
| Investment advisory and management fees | 2017-12-31 | $227,293 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2017-12-31 | $79,761,917 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2017-12-31 | $73,994,046 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2017-12-31 | $35 |
| Asset value of US Government securities at end of year | 2017-12-31 | $6,887,285 |
| Asset value of US Government securities at beginning of year | 2017-12-31 | $5,671,553 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2017-12-31 | $10,025,890 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2017-12-31 | Yes |
| Was there a failure to transmit to the plan any participant contributions | 2017-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2017-12-31 | No |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2017-12-31 | $4,963,772 |
| Contract administrator fees | 2017-12-31 | $52,499 |
| Did the plan have assets held for investment | 2017-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2017-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2017-12-31 | No |
| Aggregate proceeds on sale of assets | 2017-12-31 | $10,183,614 |
| Aggregate carrying amount (costs) on sale of assets | 2017-12-31 | $10,107,326 |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2017-12-31 | Yes |
| Opinion of an independent qualified public accountant for this plan | 2017-12-31 | Disclaimer |
| Accountancy firm name | 2017-12-31 | PLANTE & MORAN, PLLC |
| Accountancy firm EIN | 2017-12-31 | 381357951 |
| 2016 : CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2016 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2016-12-31 | $-810,027 |
| Total unrealized appreciation/depreciation of assets | 2016-12-31 | $-810,027 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2016-12-31 | $61,477 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2016-12-31 | $64,039 |
| Total income from all sources (including contributions) | 2016-12-31 | $7,674,090 |
| Total loss/gain on sale of assets | 2016-12-31 | $1,381,116 |
| Total of all expenses incurred | 2016-12-31 | $5,350,145 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2016-12-31 | $4,753,236 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2016-12-31 | $0 |
| Value of total assets at end of year | 2016-12-31 | $79,774,492 |
| Value of total assets at beginning of year | 2016-12-31 | $77,453,109 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2016-12-31 | $596,909 |
| Total interest from all sources | 2016-12-31 | $3 |
| Total dividends received (eg from common stock, registered investment company shares) | 2016-12-31 | $2,257,717 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2016-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2016-12-31 | $2,257,717 |
| Administrative expenses professional fees incurred | 2016-12-31 | $50,878 |
| Was this plan covered by a fidelity bond | 2016-12-31 | Yes |
| Value of fidelity bond cover | 2016-12-31 | $5,000,000 |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2016-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2016-12-31 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2016-12-31 | $108,893 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2016-12-31 | $127,862 |
| Administrative expenses (other) incurred | 2016-12-31 | $265,083 |
| Liabilities. Value of operating payables at end of year | 2016-12-31 | $61,477 |
| Liabilities. Value of operating payables at beginning of year | 2016-12-31 | $64,039 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2016-12-31 | No |
| Value of net income/loss | 2016-12-31 | $2,323,945 |
| Value of net assets at end of year (total assets less liabilities) | 2016-12-31 | $79,713,015 |
| Value of net assets at beginning of year (total assets less liabilities) | 2016-12-31 | $77,389,070 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2016-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2016-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2016-12-31 | No |
| Investment advisory and management fees | 2016-12-31 | $235,507 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2016-12-31 | $73,994,046 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2016-12-31 | $69,086,362 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2016-12-31 | $3 |
| Asset value of US Government securities at end of year | 2016-12-31 | $5,671,553 |
| Asset value of US Government securities at beginning of year | 2016-12-31 | $8,238,885 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2016-12-31 | $4,845,281 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2016-12-31 | Yes |
| Was there a failure to transmit to the plan any participant contributions | 2016-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2016-12-31 | No |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2016-12-31 | $4,753,236 |
| Contract administrator fees | 2016-12-31 | $45,441 |
| Did the plan have assets held for investment | 2016-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2016-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2016-12-31 | No |
| Aggregate proceeds on sale of assets | 2016-12-31 | $9,965,053 |
| Aggregate carrying amount (costs) on sale of assets | 2016-12-31 | $8,583,937 |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2016-12-31 | Yes |
| Opinion of an independent qualified public accountant for this plan | 2016-12-31 | Disclaimer |
| Accountancy firm name | 2016-12-31 | PLANTE & MORAN, PLLC |
| Accountancy firm EIN | 2016-12-31 | 381357951 |
| 2015 : CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2015 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2015-12-31 | $-567,324 |
| Total unrealized appreciation/depreciation of assets | 2015-12-31 | $-567,324 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2015-12-31 | $64,039 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2015-12-31 | $79,933 |
| Total income from all sources (including contributions) | 2015-12-31 | $-1,816,014 |
| Total loss/gain on sale of assets | 2015-12-31 | $-159,355 |
| Total of all expenses incurred | 2015-12-31 | $5,147,161 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2015-12-31 | $4,743,436 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2015-12-31 | $0 |
| Value of total assets at end of year | 2015-12-31 | $77,453,109 |
| Value of total assets at beginning of year | 2015-12-31 | $84,432,178 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2015-12-31 | $403,725 |
| Total interest from all sources | 2015-12-31 | $0 |
| Total dividends received (eg from common stock, registered investment company shares) | 2015-12-31 | $2,040,231 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2015-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2015-12-31 | $2,040,231 |
| Was this plan covered by a fidelity bond | 2015-12-31 | Yes |
| Value of fidelity bond cover | 2015-12-31 | $5,000,000 |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2015-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2015-12-31 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2015-12-31 | $127,862 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2015-12-31 | $128,945 |
| Administrative expenses (other) incurred | 2015-12-31 | $99,836 |
| Liabilities. Value of operating payables at end of year | 2015-12-31 | $64,039 |
| Liabilities. Value of operating payables at beginning of year | 2015-12-31 | $79,933 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2015-12-31 | No |
| Value of net income/loss | 2015-12-31 | $-6,963,175 |
| Value of net assets at end of year (total assets less liabilities) | 2015-12-31 | $77,389,070 |
| Value of net assets at beginning of year (total assets less liabilities) | 2015-12-31 | $84,352,245 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2015-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2015-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2015-12-31 | No |
| Investment advisory and management fees | 2015-12-31 | $260,257 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2015-12-31 | $69,086,362 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2015-12-31 | $84,303,233 |
| Asset value of US Government securities at end of year | 2015-12-31 | $8,238,885 |
| Asset value of US Government securities at beginning of year | 2015-12-31 | $0 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2015-12-31 | $-3,129,566 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2015-12-31 | Yes |
| Was there a failure to transmit to the plan any participant contributions | 2015-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2015-12-31 | No |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2015-12-31 | $4,743,436 |
| Contract administrator fees | 2015-12-31 | $43,632 |
| Did the plan have assets held for investment | 2015-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2015-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2015-12-31 | No |
| Aggregate proceeds on sale of assets | 2015-12-31 | $16,003,676 |
| Aggregate carrying amount (costs) on sale of assets | 2015-12-31 | $16,163,031 |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2015-12-31 | Yes |
| Opinion of an independent qualified public accountant for this plan | 2015-12-31 | Disclaimer |
| Accountancy firm name | 2015-12-31 | PLANTE & MORAN, PLLC |
| Accountancy firm EIN | 2015-12-31 | 381357951 |
| 2014 : CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2014 401k financial data |
|---|
| Total unrealized appreciation/depreciation of assets | 2014-12-31 | $0 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2014-12-31 | $79,933 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2014-12-31 | $74,050 |
| Total income from all sources (including contributions) | 2014-12-31 | $8,092,051 |
| Total loss/gain on sale of assets | 2014-12-31 | $0 |
| Total of all expenses incurred | 2014-12-31 | $6,581,988 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2014-12-31 | $6,170,807 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2014-12-31 | $0 |
| Value of total assets at end of year | 2014-12-31 | $84,432,178 |
| Value of total assets at beginning of year | 2014-12-31 | $82,916,232 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2014-12-31 | $411,181 |
| Total interest from all sources | 2014-12-31 | $0 |
| Total dividends received (eg from common stock, registered investment company shares) | 2014-12-31 | $2,297,784 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2014-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2014-12-31 | $2,297,784 |
| Was this plan covered by a fidelity bond | 2014-12-31 | Yes |
| Value of fidelity bond cover | 2014-12-31 | $5,000,000 |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2014-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2014-12-31 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2014-12-31 | $128,945 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2014-12-31 | $117,497 |
| Administrative expenses (other) incurred | 2014-12-31 | $78,430 |
| Liabilities. Value of operating payables at end of year | 2014-12-31 | $79,933 |
| Liabilities. Value of operating payables at beginning of year | 2014-12-31 | $74,050 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2014-12-31 | No |
| Value of net income/loss | 2014-12-31 | $1,510,063 |
| Value of net assets at end of year (total assets less liabilities) | 2014-12-31 | $84,352,245 |
| Value of net assets at beginning of year (total assets less liabilities) | 2014-12-31 | $82,842,182 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2014-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2014-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2014-12-31 | No |
| Investment advisory and management fees | 2014-12-31 | $285,344 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2014-12-31 | $84,303,233 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2014-12-31 | $82,798,735 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2014-12-31 | $5,794,267 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2014-12-31 | Yes |
| Was there a failure to transmit to the plan any participant contributions | 2014-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2014-12-31 | No |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2014-12-31 | $6,170,807 |
| Contract administrator fees | 2014-12-31 | $47,407 |
| Did the plan have assets held for investment | 2014-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2014-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2014-12-31 | No |
| Aggregate proceeds on sale of assets | 2014-12-31 | $367,258 |
| Aggregate carrying amount (costs) on sale of assets | 2014-12-31 | $367,258 |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2014-12-31 | Yes |
| Opinion of an independent qualified public accountant for this plan | 2014-12-31 | Disclaimer |
| Accountancy firm name | 2014-12-31 | PLANTE & MORAN, PLLC |
| Accountancy firm EIN | 2014-12-31 | 381357951 |
| 2013 : CENTURY ALUMINUM SEBREE HOURLY PENSION PLAN 2013 401k financial data |
|---|
| Total unrealized appreciation/depreciation of assets | 2013-12-31 | $0 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2013-12-31 | $74,050 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2013-12-31 | $0 |
| Total income from all sources (including contributions) | 2013-12-31 | $11,122,250 |
| Total loss/gain on sale of assets | 2013-12-31 | $0 |
| Total of all expenses incurred | 2013-12-31 | $4,641,281 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2013-12-31 | $4,209,914 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2013-12-31 | $4,488,263 |
| Value of total assets at end of year | 2013-12-31 | $82,916,232 |
| Value of total assets at beginning of year | 2013-12-31 | $76,361,213 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2013-12-31 | $431,367 |
| Total interest from all sources | 2013-12-31 | $79 |
| Total dividends received (eg from common stock, registered investment company shares) | 2013-12-31 | $1,113,561 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2013-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2013-12-31 | $1,113,561 |
| Was this plan covered by a fidelity bond | 2013-12-31 | Yes |
| Value of fidelity bond cover | 2013-12-31 | $5,000,000 |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2013-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2013-12-31 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2013-12-31 | $117,497 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2013-12-31 | $0 |
| Administrative expenses (other) incurred | 2013-12-31 | $325,807 |
| Liabilities. Value of operating payables at end of year | 2013-12-31 | $74,050 |
| Liabilities. Value of operating payables at beginning of year | 2013-12-31 | $0 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2013-12-31 | No |
| Value of net income/loss | 2013-12-31 | $6,480,969 |
| Value of net assets at end of year (total assets less liabilities) | 2013-12-31 | $82,842,182 |
| Value of net assets at beginning of year (total assets less liabilities) | 2013-12-31 | $76,361,213 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2013-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2013-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2013-12-31 | No |
| Investment advisory and management fees | 2013-12-31 | $80,569 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2013-12-31 | $82,798,735 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2013-12-31 | $0 |
| Value of interest in master investment trust accounts at end of year | 2013-12-31 | $0 |
| Value of interest in master investment trust accounts at beginning of year | 2013-12-31 | $61,841,213 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2013-12-31 | $79 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2013-12-31 | $3,693,548 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2013-12-31 | Yes |
| Was there a failure to transmit to the plan any participant contributions | 2013-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2013-12-31 | No |
| Contributions received in cash from employer | 2013-12-31 | $4,488,263 |
| Employer contributions (assets) at end of year | 2013-12-31 | $0 |
| Employer contributions (assets) at beginning of year | 2013-12-31 | $14,520,000 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2013-12-31 | $4,209,914 |
| Contract administrator fees | 2013-12-31 | $24,991 |
| Did the plan have assets held for investment | 2013-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2013-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2013-12-31 | No |
| Aggregate proceeds on sale of assets | 2013-12-31 | $79,559,627 |
| Aggregate carrying amount (costs) on sale of assets | 2013-12-31 | $79,559,627 |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2013-12-31 | Yes |
| Opinion of an independent qualified public accountant for this plan | 2013-12-31 | Disclaimer |
| Accountancy firm name | 2013-12-31 | PLANTE & MORAN, PLLC |
| Accountancy firm EIN | 2013-12-31 | 381357951 |
