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U.S. MINING ENTITIES / OPERATOR / P24224

ACTIVE / OPERATOR PORTFOLIO

Thunder Basin Coal Company LLC

Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.

MSHA OPERATOR IDP24224

MINE PORTFOLIO

2 of 2 mines and facilities

2025-01-01 – 2026-10-13. Active records; production reporting is not required.

Material, method and type filters apply to this table. The portfolio’s status applies to the entire page. GEM fields describe their own release, not the selected MSHA year.

MineLocation / typeCoal · short tonsHours workedViolationsAccident recordsOn-site inspection hours
Black Thunder4800977 · Active6/8 quarters reportedCampbell, WYSurface · MSHA: Coal (Bituminous)70,462,9552,525,67517323917.3
Coal Creek Mine4801215 · Active6/8 quarters reportedCampbell, WYSurface · MSHA: Coal (Bituminous)2,572,759107,835260237.8

Production and hours sum available quarterly reports. — means unavailable; zero safety records means none in the selected imported period. Ownership reflects the current MSHA record.

LOCATION

Portfolio map

2 of 2 mines with usable MSHA coordinates. Select a marker to open a mine.

Mine coordinates

2025-01-01 – 2026-10-13Applies to production, safety and portfolio metrics. Silica samples have separate filters.

2025 Q1 – 2026 Q4

JSONCSV

Database snapshot · 2026-10-13. All 2 mines listed under this operator were checked; 2 have reports in the available quarters. Totals use current ownership.

Coal production

73,035,714

reported short tons

  1. 2025 Q112,686,093
  2. 2025 Q212,555,660
  3. 2025 Q313,030,450
  4. 2025 Q412,646,716
  5. 2026 Q111,913,178
  6. 2026 Q210,203,617
  7. 2026 Q3—No usable value reported
  8. 2026 Q4 *—No usable value reported

Hours worked

2,633,510

reported employee hours

  1. 2025 Q1426,302
  2. 2025 Q2428,404
  3. 2025 Q3453,689
  4. 2025 Q4452,600
  5. 2026 Q1444,564
  6. 2026 Q2427,951
  7. 2026 Q3—No usable value reported
  8. 2026 Q4 *—No usable value reported

Tons per hour

27.73

production ÷ hours worked

  1. 2025 Q129.76
  2. 2025 Q229.31
  3. 2025 Q328.72
  4. 2025 Q427.94
  5. 2026 Q126.80
  6. 2026 Q223.84
  7. 2026 Q3—No usable value reported
  8. 2026 Q4 *—No usable value reported

Missing values appear as —. Totals use available reports. Tons per hour requires production and hours for the same quarters and a nonzero hours total. * Striped bars mark partial mine coverage or an incomplete quarter. See the table for coverage.

Quarterly data and reporting coverage
Quarterly production, employment and reporting coverage for Thunder Basin Coal Company LLC
QuarterCoal (short tons)Hours workedTons / hourAvg. employeesCoverage
2025 Q112,686,093426,30229.768312/2 mines reporting
2025 Q212,555,660428,40429.318172/2 mines reporting
2025 Q313,030,450453,68928.728432/2 mines reporting
2025 Q412,646,716452,60027.948322/2 mines reporting
2026 Q111,913,178444,56426.808412/2 mines reporting
2026 Q210,203,617427,95123.848352/2 mines reporting
2026 Q3————No report
2026 Q4————No report

Safety and enforcement

2025-01-01 – 2026-10-13

Violations

199

35 significant & substantial (S&S)

  1. 2025 Q136
  2. 2025 Q214
  3. 2025 Q331
  4. 2025 Q460
  5. 2026 Q12
  6. 2026 Q250
  7. 2026 Q30
  8. 2026 Q4 *6

Accident records

23

0 records classified as fatality

  1. 2025 Q11
  2. 2025 Q22
  3. 2025 Q34
  4. 2025 Q45
  5. 2026 Q15
  6. 2026 Q24
  7. 2026 Q32
  8. 2026 Q4 *0

Proposed penalties · USD

100,504.00

193 of 199 violations with amounts

  1. 2025 Q117,657
  2. 2025 Q29,823
  3. 2025 Q39,080
  4. 2025 Q417,039
  5. 2026 Q13,497
  6. 2026 Q243,408
  7. 2026 Q3—
  8. 2026 Q4 *—

On-site inspection hours

1,155.00

13 inspections · 13 with hours

  1. 2025 Q1—
  2. 2025 Q2278.00
  3. 2025 Q371.50
  4. 2025 Q4417.50
  5. 2026 Q134.50
  6. 2026 Q2302.75
  7. 2026 Q30.00
  8. 2026 Q4 *50.75

Counts are published records, including contractor records. * The quarter was incomplete at the snapshot date; recent counts may rise as reports arrive. — means no reported amount or hours. Portfolio totals use current membership.

Quarterly safety data
QuarterViolationsS&SProposed USDAccident recordsFatality recordsInspectionsOn-site hours
2025-Q136817,657.00100—
2025-Q21439,823.00201278.0
2025-Q33159,080.0040171.5
2025-Q460317,039.00503417.5
2026-Q1223,497.0050334.5
2026-Q2501243,408.00403302.8
2026-Q300—2010.0
2026-Q4 *62—00150.8

Most cited CFR sections

All violations issued in the selected period. Counts combine subsections.

SectionViolationsS&S
30 CFR 77.502Electric equipment; examination, testing, and maintenance.244
30 CFR 77.1110Examination and maintenance of firefighting equipment.190
30 CFR 77.1104Accumulations of combustible materials.151
30 CFR 77.404Machinery and equipment; operation and maintenance.112
30 CFR 77.1605Loading and haulage equipment; installations.104
30 CFR 77.1710Protective clothing; requirements.108
30 CFR 77.1606Loading and haulage equipment; inspection and maintenance.90
30 CFR 77.512Inspection and cover plates.91
30 CFR 77.1607Loading and haulage equipment; operation.71
30 CFR 77.400Mechanical equipment guards.72

Safety activity

  1. violation5033581
    Black Thunder · 4800977

    77.1606(c)

  2. violation5034575
    Black Thunder · 4800977

    77.505

  3. violation5034223
    Black Thunder · 4800977

    77.1606(c)

  4. inspectionF03EA02
    Black Thunder · 4800977

    Regular Safety and Health Inspection · 50.8 on-site hours

  5. violation5034222
    Black Thunder · 4800977

    77.1605(l) · S&S

  6. violation5034221
    Black Thunder · 4800977

    77.602(a) · S&S

  7. violation5033580
    Black Thunder · 4800977

    77.1000

  8. accident220262600009
    Black Thunder · 4800977

    HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    the incident occurred when an employee was aligning and installing a 120Lb truck bed pivot pin into the left rear truck pivot bore. the pivot pin slipped during manual positioning and the employees' finger was smashed between the pin and the bore opening. the injury resulted in a near amputation of the right pinky fingertip near the first knuckle

  9. inspectionF010EEF
    Black Thunder · 4800977

    Verbal Hazard Complaint Inspections · 0.0 on-site hours

  10. accident220262310001
    Black Thunder · 4800977

    SLIP OR FALL OF PERSON · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    Employee was exiting the pit bus at the beginning of shift when they slipped causing a small verifiable fracture to the fibula. Employee was able to return to work.

  11. accident220261620003
    Black Thunder · 4800977

    FIRE · ACCIDENT ONLY

    Accident narrative

    A grass fire started at the rail road tracks and spread to the mine property. The fire could not be put out in 15 minutes.

  12. violation5034214
    Black Thunder · 4800977

    77.1110 · $432.00 proposed

  13. violation5033779
    Black Thunder · 4800977

    77.400(a) · $366.00 proposed

  14. violation5034213
    Black Thunder · 4800977

    77.1713(d)(1) · $504.00 proposed

  15. violation5033778
    Black Thunder · 4800977

    77.502 · $465.00 proposed

  16. accident220261620004
    Black Thunder · 4800977

    SLIP OR FALL OF PERSON · DAYS AWAY FROM WORK ONLY

    Accident narrative

    Employee was walking down the boarding ladder of haul truck when EE slipped and injured EE's arm trying to catch self. Dr. appointment on 06/03/26 confirmed bicep tear.

  17. violation5034211
    Black Thunder · 4800977

    77.410(c) · $151.00 proposed

  18. violation5034210
    Black Thunder · 4800977

    77.1110 · $465.00 proposed

  19. violation5034209
    Black Thunder · 4800977

    77.502 · $465.00 proposed

  20. violation5034208
    Black Thunder · 4800977

    77.809 · $151.00 proposed

  21. violation5033554
    Black Thunder · 4800977

    77.1607(p) · $245.00 proposed

  22. violation5033553
    Black Thunder · 4800977

    77.404(a) · $193.00 proposed

  23. violation5034207
    Black Thunder · 4800977

    77.1104 · $209.00 proposed

  24. violation5034206
    Black Thunder · 4800977

    77.1109(a) · S&S · $818.00 proposed

  25. violation5034205
    Black Thunder · 4800977

    77.208(d) · $245.00 proposed

Safety sources and definitions

MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-13.

Counts describe published rows, including contractor records; accident records are not distinct incidents or numbers of people injured.

Zero means no matching records in the imported sources, not proof of no events. Historical coverage differs by source; absence before a source begins reporting is not a zero incident rate. Invalid or absent dates and records after the snapshot are excluded.

S&S means SIG_SUB=Y. Fatality records use DEGREE_INJURY_CD=01. Proposed penalties are not final assessed or paid amounts; missing dollar values are omitted.

Inspection hours are SUM_TOTAL_ON_SITE_HOURS attributed to the inspection start date, without supervisor/trainee hours. Missing hours are omitted; a started inspection may still be open.

Portfolio totals use current mine membership, including events before the current owner or operator's tenure.

CFR headings link to the current Title 30 index; they are not historical legal determinations.

EIA-923 · COAL RECEIPTS

Coal shipments and quality

Receipts reported by power plants and terminals, matched by MSHA mine ID.

Latest EIA month: 2026-07Source checked 2026-10-13 · publication lag differs from MSHA.

REPORTED RECEIPTS · SHORT TONS47,596,291751 rows · 54 receiving plants
HEAT CONTENT · BTU/LB8,899Weighted by reported tons
SULFUR / ASH · % BY WEIGHT0.30 / 5.13Separate averages over measured receipts
DELIVERED COST · USD/TON37.8193.0% of reported tons have usable costs
Quarterly receipts and quality
QuarterShort tonsHeat · Btu/lbSulfur %Ash %Delivered USD/ton
2025-Q3 *8,684,9138,8640.335.2835.41
2025-Q413,237,1678,8840.305.1037.79
2026-Q111,398,0528,9250.295.1438.61
2026-Q29,873,3788,9120.315.1238.73
2026-Q3 *4,402,7818,9180.284.9038.38
Month / sourceMineReceiving plant / supplierShort tonsDelivered USD/tonHeat · Btu/lbSulfur %Ash %PurchaseTransport
2026-07EIA row 11355 · preliminaryBLACK THUNDER4800977Holcomb108 · KS · BLACK THUNDER - ARCH30,70432.208,9790.245.00ContractSUBRail
2026-07EIA row 11387 · preliminaryBLACK THUNDER4800977Comanche (CO)470 · CO · ARCH28,47031.039,0530.234.00ContractSUBRail
2026-07EIA row 11388 · preliminaryBLACK THUNDER4800977Comanche (CO)470 · CO · ARCH28,32331.349,1000.224.20ContractSUBRail
2026-07EIA row 11495 · preliminaryBLACK THUNDER4800977Michigan City997 · IN · CORE NATURAL RESOURCES, INC15,15143.828,8850.194.40ContractSUBRail
2026-07EIA row 11514 · preliminaryBLACK THUNDER4800977Walter Scott Jr Energy Center1082 · IA · CORE SALES LLC131,03226.668,9830.244.40ContractSUBRail
2026-07EIA row 11530 · preliminaryBLACK THUNDER4800977La Cygne1241 · KS · CORE NATURAL RESOURCES, INC32,60629.868,9410.274.60SpotSUBRail
2026-07EIA row 11531 · preliminaryBLACK THUNDER4800977La Cygne1241 · KS · CORE NATURAL RESOURCES, INC32,70029.879,0090.264.40SpotSUBRail
2026-07EIA row 11535 · preliminaryBLACK THUNDER4800977La Cygne1241 · KS · CORE NATURAL RESOURCES, INC32,72630.888,8220.355.70SpotSUBRail
2026-07EIA row 11536 · preliminaryBLACK THUNDER4800977La Cygne1241 · KS · CORE NATURAL RESOURCES, INC97,69630.258,7130.356.00SpotSUBRail
2026-07EIA row 11537 · preliminaryBLACK THUNDER4800977La Cygne1241 · KS · CORE NATURAL RESOURCES, INC81,93829.528,7800.385.60SpotSUBRail
2026-07EIA row 11539 · preliminaryBLACK THUNDER4800977La Cygne1241 · KS · CORE NATURAL RESOURCES, INC49,19229.538,7180.365.50SpotSUBRail
2026-07EIA row 11541 · preliminaryBLACK THUNDER4800977Lawrence Energy Center1250 · KS · CORE NATURAL RESOURCES, INC31,75640.649,0240.224.50SpotSUBRail
2026-07EIA row 11543 · preliminaryBLACK THUNDER4800977Lawrence Energy Center1250 · KS · CORE NATURAL RESOURCES, INC47,41340.488,8070.365.60SpotSUBRail
2026-07EIA row 11572 · preliminaryBLACK THUNDER4800977Shawnee1379 · KY · ARCH COAL SALES31,79335.008,9930.244.80ContractSUBRail
2026-07EIA row 11573 · preliminaryBLACK THUNDER4800977Shawnee1379 · KY · ARCH COAL SALES31,87134.279,0190.234.60ContractSUBRail
2026-07EIA row 11574 · preliminaryBLACK THUNDER4800977Shawnee1379 · KY · ARCH COAL SALES47,33833.428,9980.234.30ContractSUBRail
2026-07EIA row 11584 · preliminaryBLACK THUNDER4800977R S Nelson1393 · LA · ARCH COAL SALES15,18840.599,0600.254.40ContractSUBRail
2026-07EIA row 11586 · preliminaryBLACK THUNDER4800977R S Nelson1393 · LA · NAVAJO TRANSITIONAL ENERGY CO., LLC45,11241.599,0250.204.40ContractSUBRail
2026-07EIA row 11587 · preliminaryBLACK THUNDER4800977R S Nelson1393 · LA · ARCH COAL SALES45,38541.079,0100.214.50ContractSUBRail
2026-07EIA row 11633 · preliminaryBLACK THUNDER4800977J H Campbell1710 · MI · ARCH COAL SALES173,68852.139,0060.224.40SpotSUBRail
2026-07EIA row 11634 · preliminaryBLACK THUNDER4800977J H Campbell1710 · MI · ARCH COAL SALES47,67551.498,9640.234.60SpotSUBRail
2026-07EIA row 11639 · preliminaryBLACK THUNDER4800977Monroe (MI)1733 · MI · ARCH COAL SALES79,07041.239,0700.224.40ContractSUBRail
2026-07EIA row 11640 · preliminaryBLACK THUNDER4800977Monroe (MI)1733 · MI · ARCH COAL SALES142,20041.388,9260.264.80ContractSUBRail
2026-07EIA row 11645 · preliminaryBLACK THUNDER4800977Clay Boswell1893 · MN · BLACK THUNDER - ARCH125,60747.288,8250.285.00ContractSUBRail
2026-07EIA row 11666 · preliminaryBLACK THUNDER4800977Hawthorn2079 · MO · CORE NATURAL RESOURCES, INC16,39027.458,7080.365.70SpotSUBRail

Delivered cost includes transport and is not mine revenue. Missing prices remain blank. * Fewer than three months are published in the selected quarter. Receipts reflect the months EIA has published; an unfinished quarter is not comparable with a full quarter. Portfolio matches use current ownership.

Coverage, sources and calculations
  • Reported coal receipts at EIA-923 power plants/terminals; this is not a census of mine shipments, exports or metallurgical sales.
  • Matches use only the published MSHA ID, normalized to seven digits. Unidentified mine origins remain in the source table but are not assigned to a mine.
  • Portfolio attribution uses current MSHA ownership, not ownership at the shipment date. Receipts and production can differ because of timing, stocks and coverage.
  • Quality means are weighted by positive reported tons with that measurement. Delivered cost uses only rows with published cost, positive heat and positive tons; missing/withheld costs are never zero-filled.
  • USD/ton = (cents/MMBtu ÷ 100) × MMBtu/ton. This is plant delivered cost, not mine sales price or revenue.
  • Receipt month is as published, including records supplied by annual respondents. Recent months are preliminary and subject to revision. Missing rows do not prove zero shipments.

Imported releases start 2008-01. This window includes 12 published months. EIA releases · Survey instructions

  • 2026 · preliminary · EIA923_Schedules_2_3_4_5_M_07_2026_21SEP2026.xlsx · Page 5 Fuel Receipts and Costs
  • 2025 · final · EIA923_Schedules_2_3_4_5_M_12_2025_Final.xlsx · Page 5 Fuel Receipts and Costs

EIA ANNUAL COAL REPORT · 2024

Coal prices and estimated revenue

Annual county prices and a production-based allocation of county coal sales.

Latest priced year: 2024Source checked 2026-10-13. Prices apply only to their calendar year.

FOB PRICE BENCHMARK · USD/TON13.96Weighted by estimated sales of covered mines
ESTIMATED SALES · SHORT TONS46,029,796Allocated from published county sales
ESTIMATED COAL REVENUE · USD642,575,957Covered mines only · not reported revenue
ANNUAL PRODUCTION COVERED100.0%2 of 2 producing annual mine records

The estimate assumes each eligible mine receives its county-average price and shares county sales in proportion to production. Actual sales and prices can differ substantially. All producing annual records in this selection have estimates. Annual price data uses a separate window from the MSHA charts.

Mine / countyAnnual production · tonsCounty FOB · USD/tonEst. sales · tonsEst. coal revenue · USDBasis / availability
Black Thunder4800977 · Campbell, Wyoming44,480,97613.9644,477,605620,907,365County allocation estimate26.16% of eligible county production11 eligible mines / 11 sales respondents
Coal Creek Mine4801215 · Campbell, Wyoming1,552,30913.961,552,19121,668,591County allocation estimate0.91% of eligible county production11 eligible mines / 11 sales respondents
Method, assumptions and source records
  1. This is an annual county-sales allocation, not reported mine or company revenue. Currency is nominal USD in the source year; quantities are short tons.
  2. Mine share = same-year annual mine production / eligible same-county production. Estimated sales = published county sales × share. Estimated coal revenue = estimated sales × published county average FOB price.
  3. The model assumes eligible mines share county sales in proportion to production and receive the county-average price. Matching mine counts is a check, not proof of identical respondents. Mine quality, contracts and sales timing can differ substantially. No statistical confidence interval is implied.
  4. FOB excludes transport and insurance. EIA-923 delivered costs do not enter this model. No grade premium, state/national fallback, quarterly apportionment or carry-forward to a later year is applied.
  5. Eligibility follows the source's production threshold and excludes preparation-only and refuse operations. Withheld values, inconsistent county counts and missing/ambiguous locations produce no estimate.
  6. County sales are published in thousands of tons and prices to cents. Calculations retain precision, but the inputs are rounded and the allocation is approximate.
  7. Portfolio attribution uses current MSHA ownership, not ownership during the sales year. Covered-mine sums exclude unavailable estimates and must not be read as whole-company revenue. Coverage denominators use the annual EIA mine-production release.

Sales-reporting threshold: 50,000 short tons per mine in 2024. Withheld sales or prices stay unavailable.

EIA Table 30 · county sales and FOB prices · EIA annual mine production · Release index

Annual report released November 19, 2025. Method: county-sales-allocation-v1. JSON and CSV preserve source row numbers and file checksums.

SELECTED PORTFOLIO

1 linked controller.

Relationships reflect the selected mine status and current MSHA controller/operator fields.

CONTROLLER / 0189840Core Natural Resources Inc2 selected mines →