Coal production
10,998,577reported short tons
ACTIVE / CONTROLLER PORTFOLIO
Wolverine Fuels LLC
Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.
MSHA CONTROLLER ID0110263
MINE PORTFOLIO
6 of 6 mines and facilities
2025-01-01 – 2026-10-18. 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.
| Mine | Location / type | Coal · short tons | Hours worked | Violations | Accident records | On-site inspection hours |
|---|---|---|---|---|---|---|
| CASTLE VALLEY PREP PLANT4202455 · Active6/8 quarters reported | Carbon, UTFacility · MSHA: Coal (Bituminous) | 0 | 22,276 | 0 | 0 | 49.5 |
| Emery Valley Mine4200079 · Active6/8 quarters reported | Emery, UTUnderground · MSHA: Coal (Bituminous) | 1,339,277 | 506,090 | 263 | 15 | 2,100.3 |
| Fossil Rock Mine4201211 · Active6/8 quarters reported | Emery, UTUnderground · MSHA: Coal (Bituminous) | 1,354,242 | 602,746 | 232 | 7 | 2,135.3 |
| HUNTER PREP PLANT4202052 · Active6/8 quarters reported | Emery, UTFacility · MSHA: Coal (Bituminous) | 0 | 47,232 | 1 | 0 | 66.8 |
| SKYLINE MINE #34201566 · Active6/8 quarters reported | Carbon, UTUnderground · MSHA: Coal (Bituminous) | 3,131,203 | 1,210,611 | 277 | 13 | 2,590.0 |
| SUFCO4200089 · Active6/8 quarters reported | Sevier, UTUnderground · MSHA: Coal (Bituminous) | 5,173,855 | 1,293,228 | 351 | 21 | 3,456.8 |
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
6 of 6 mines with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- CASTLE VALLEY PREP PLANT39.53361, -110.77556Open map ↗
- Emery Valley Mine38.87333, -111.18722Open map ↗
- Fossil Rock Mine39.31806, -111.31806Open map ↗
- HUNTER PREP PLANT39.16833, -111.17250Open map ↗
- SKYLINE MINE #339.68306, -111.19306Open map ↗
- SUFCO38.91333, -111.41694Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-18. All 6 mines listed under this controller were checked; 6 have reports in the available quarters. Totals use current ownership.
Hours worked
3,682,183reported employee hours
Tons per hour
2.99production ÷ hours worked
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
| Quarter | Coal (short tons) | Hours worked | Tons / hour | Avg. employees | Coverage |
|---|---|---|---|---|---|
| 2025 Q1 | 2,130,151 | 652,645 | 3.26 | 1,274 | 6/6 mines reporting |
| 2025 Q2 | 1,942,346 | 663,299 | 2.93 | 1,282 | 6/6 mines reporting |
| 2025 Q3 | 2,300,771 | 716,641 | 3.21 | 1,226 | 6/6 mines reporting |
| 2025 Q4 | 1,719,068 | 621,849 | 2.76 | 1,245 | 6/6 mines reporting |
| 2026 Q1 | 1,192,085 | 540,866 | 2.20 | 1,161 | 6/6 mines reporting |
| 2026 Q2 | 1,714,156 | 486,883 | 3.52 | 1,004 | 6/6 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-18
Violations
1,12497 significant & substantial (S&S)
Accident records
560 records classified as fatality
Proposed penalties · USD
553,597.00973 of 1,124 violations with amounts
On-site inspection hours
10,398.5097 inspections · 97 with hours
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
| Quarter | Violations | S&S | Proposed USD | Accident records | Fatality records | Inspections | On-site hours |
|---|---|---|---|---|---|---|---|
| 2025-Q1 | 168 | 17 | 157,881.00 | 11 | 0 | 6 | 1,386.5 |
| 2025-Q2 | 180 | 10 | 67,781.00 | 12 | 0 | 11 | 1,399.8 |
| 2025-Q3 | 190 | 17 | 102,292.00 | 7 | 0 | 15 | 1,646.5 |
| 2025-Q4 | 160 | 19 | 121,662.00 | 12 | 0 | 14 | 1,569.3 |
| 2026-Q1 | 99 | 14 | 32,696.00 | 4 | 0 | 10 | 1,279.3 |
| 2026-Q2 | 135 | 12 | 45,557.00 | 2 | 0 | 21 | 1,391.0 |
| 2026-Q3 | 160 | 6 | 25,728.00 | 8 | 0 | 16 | 1,535.8 |
| 2026-Q4 * | 32 | 2 | — | 0 | 0 | 4 | 190.5 |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
- Emery Valley Mine · 4200079
75.202(a)
- Emery Valley Mine · 4200079
75.501-2(a)(2)
- SUFCO · 4200089
75.512
- SUFCO · 4200089
75.400
- Fossil Rock Mine · 4201211
75.503
- Emery Valley Mine · 4200079
75.342(a)(4)
- Emery Valley Mine · 4200079
75.515
- Fossil Rock Mine · 4201211
75.1725(a)
- SKYLINE MINE #3 · 4201566
75.220(a)(1)
- SKYLINE MINE #3 · 4201566
75.1714-7(a)
- SUFCO · 4200089
75.400
- SUFCO · 4200089
75.601-1
- SUFCO · 4200089
75.360(g)
- SKYLINE MINE #3 · 4201566
75.1100-3
- SUFCO · 4200089
75.360(g)
- Fossil Rock Mine · 4201211
75.370(a)(1)
- Fossil Rock Mine · 4201211
75.380(d)(1) · S&S
- Emery Valley Mine · 4200079
75.1600-2(e)
- Emery Valley Mine · 4200079
75.1100-3
- SUFCO · 4200089
75.380(d)(4)
- SUFCO · 4200089
75.1731(b)
- Fossil Rock Mine · 4201211
75.333(h)
- Emery Valley Mine · 4200079
75.370(a)(1)
- Emery Valley Mine · 4200079
75.1702
- SUFCO · 4200089
75.202(a) · S&S
Safety sources and definitions
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-18.
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.
Quarterly receipts and quality
| Quarter | Short tons | Heat · Btu/lb | Sulfur % | Ash % | Delivered USD/ton | |
|---|---|---|---|---|---|---|
| 2025-Q3 * | 911,431 | 10,973 | 0.95 | 12.43 | 82.75 | |
| 2025-Q4 | 1,277,670 | 11,132 | 0.87 | 11.83 | 81.85 | |
| 2026-Q1 | 1,074,885 | 11,420 | 0.65 | 11.22 | 86.06 | |
| 2026-Q2 | 1,258,765 | 11,421 | 0.71 | 11.93 | 88.03 | |
| 2026-Q3 * | 564,709 | 11,612 | 0.67 | 11.32 | 87.85 |
| Month / source | Mine | Receiving plant / supplier | Short tons | Delivered USD/ton | Heat · Btu/lb | Sulfur % | Ash % | Purchase | Transport |
|---|---|---|---|---|---|---|---|---|---|
| 2026-01EIA row 1164 · preliminary | SKYLINE MINE #34201566 | Huntington8069 · UT · SKYLINE MINE | 108,202 | 87.60 | 11,793 | 0.39 | 10.90 | ContractBIT | Truck |
| 2025-12EIA row 34866 · final | SUFCO4200089 | Hunter6165 · UT · SUFCO | 306,108 | 83.63 | 11,157 | 0.81 | 11.80 | ContractBIT | Truck |
| 2025-12EIA row 35466 · final | SUFCO4200089 | Huntington8069 · UT · SUFCO | 42,359 | 85.41 | 10,615 | 1.21 | 14.20 | ContractBIT | Truck |
| 2025-12EIA row 35467 · final | SKYLINE MINE #34201566 | Huntington8069 · UT · SKYLINE MINE | 69,373 | 85.43 | 12,016 | 0.44 | 9.50 | ContractBIT | Truck |
| 2025-11EIA row 31874 · final | SUFCO4200089 | Hunter6165 · UT · SUFCO | 304,251 | 78.29 | 11,162 | 0.82 | 11.50 | ContractBIT | Truck |
| 2025-11EIA row 32452 · final | SKYLINE MINE #34201566 | Huntington8069 · UT · SUFCO | 41,058 | 82.85 | 10,749 | 1.15 | 12.80 | ContractBIT | Truck |
| 2025-11EIA row 32453 · final | SUFCO4200089 | Huntington8069 · UT · SKYLINE MINE | 62,877 | 83.08 | 12,027 | 0.38 | 8.90 | ContractBIT | Truck |
| 2025-10EIA row 28926 · final | EMERY MINE4200079 | Hunter6165 · UT · BRONCO UTAH OPERATIONS,LLC | 519 | 87.52 | 12,142 | 0.42 | 9.70 | ContractBIT | Truck |
| 2025-10EIA row 28929 · final | SUFCO4200089 | Hunter6165 · UT · SUFCO | 258,997 | 78.39 | 11,171 | 0.86 | 11.20 | ContractBIT | Truck |
| 2025-10EIA row 29512 · final | SKYLINE MINE #34201566 | Huntington8069 · UT · SKYLINE MINE | 117,819 | 86.58 | 10,593 | 1.27 | 14.00 | ContractBIT | Truck |
| 2025-10EIA row 29513 · final | SUFCO4200089 | Huntington8069 · UT · SUFCO | 74,309 | 86.54 | 10,549 | 1.24 | 14.90 | ContractBIT | Truck |
| 2025-09EIA row 25860 · final | EMERY MINE4200079 | Hunter6165 · UT · BRONCO UTAH OPERATIONS,LLC | 42,127 | 87.02 | 12,070 | 0.41 | 9.90 | ContractBIT | Truck |
| 2025-09EIA row 25863 · final | SUFCO4200089 | Hunter6165 · UT · SUFCO | 210,080 | 78.54 | 11,015 | 0.89 | 11.30 | ContractBIT | Truck |
| 2025-09EIA row 26459 · final | SUFCO4200089 | Huntington8069 · UT · SUFCO | 74,715 | 86.73 | 10,855 | 1.22 | 12.50 | ContractBIT | Truck |
| 2025-09EIA row 26460 · final | SKYLINE MINE #34201566 | Huntington8069 · UT · SKYLINE MINE | 103,721 | 86.75 | 10,660 | 1.21 | 13.90 | ContractBIT | Truck |
| 2025-08EIA row 22731 · final | EMERY MINE4200079 | Hunter6165 · UT · BRONCO UTAH OPERATIONS,LLC | 35,681 | 86.20 | 11,952 | 0.39 | 10.10 | ContractBIT | Truck |
| 2025-08EIA row 22733 · final | SUFCO4200089 | Hunter6165 · UT · SUFCO | 241,667 | 78.28 | 11,054 | 0.87 | 11.90 | ContractBIT | Truck |
| 2025-08EIA row 22832 · final | SKYLINE MINE #34201566 | Intermountain Power Project6481 · UT · WOLVERINE FUELS LLC. | 2,340 | 76.08 | 11,393 | 0.81 | 12.40 | ContractBIT | Rail |
| 2025-08EIA row 22833 · final | EMERY MINE4200079 | Intermountain Power Project6481 · UT · CORE NATURAL RESOURCES, INC | 2,338 | 74.91 | 11,218 | 0.41 | 7.40 | ContractBIT | Rail |
| 2025-08EIA row 23367 · final | SUFCO4200089 | Huntington8069 · UT · SUFCO | 85,200 | 87.71 | 10,850 | 1.15 | 13.90 | ContractBIT | Truck |
| 2025-08EIA row 23368 · final | SKYLINE MINE #34201566 | Huntington8069 · UT · SKYLINE MINE | 113,562 | 87.70 | 10,450 | 1.09 | 14.90 | ContractBIT | Truck |
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.
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. Unavailable estimates are excluded; this is not a total for the whole portfolio. Annual price data uses a separate window from the MSHA charts.
| Mine / county | Annual production · tons | County FOB · USD/ton | Est. sales · tons | Est. coal revenue · USD | Basis / availability |
|---|---|---|---|---|---|
| Emery Mine4200079 · Emery, Utah | 1,064,605 | — | — | — | County sales or price not published2 eligible mines / 2 sales respondents |
| Sufco4200089 · Sevier, Utah | 3,099,164 | — | — | — | County sales or price not published1 eligible mines / 1 sales respondents |
| Fossil Rock Mine4201211 · Emery, Refuse Recovery | 44,687 | — | — | — | Recovery operation excluded |
| Skyline Mine #34201566 · Carbon, Utah | 2,963,808 | — | — | — | County sales or price not published1 eligible mines / 1 sales respondents |
| Hunter Prep Plant4202052 · Emery, Utah | 0 | — | — | — | Preparation plant2 eligible mines / 2 sales respondents |
| Castle Valley Prep Plant4202455 · Carbon, Utah | 0 | — | — | — | Preparation plant1 eligible mines / 1 sales respondents |
Method, assumptions and source records
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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
4 linked operators.
Relationships reflect the selected mine status and current MSHA controller/operator fields.