MINE DETAILS
SKYLINE MINE #3
MSHA MINE ID4201566
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- SKYLINE MINE #339.68306, -111.19306Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-13. MSHA quarterly production and employment reports.
Coal production
3,131,203reported short tons
Hours worked
1,210,611reported employee hours
Tons per hour
2.59production ÷ 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 | 927,152 | 236,985 | 3.91 | 427 | 1/1 mines reporting |
| 2025 Q2 | 536,149 | 236,558 | 2.27 | 427 | 1/1 mines reporting |
| 2025 Q3 | 802,228 | 308,946 | 2.60 | 441 | 1/1 mines reporting |
| 2025 Q4 | 717,684 | 220,080 | 3.26 | 420 | 1/1 mines reporting |
| 2026 Q1 | 112,339 | 159,456 | 0.70 | 302 | 1/1 mines reporting |
| 2026 Q2 | 35,651 | 48,586 | 0.73 | 96 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
27523 significant & substantial (S&S)
Accident records
130 records classified as fatality
Proposed penalties · USD
178,337.00266 of 275 violations with amounts
On-site inspection hours
2,536.5019 inspections · 19 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 | 47 | 3 | 64,231.00 | 4 | 0 | 2 | 437.0 |
| 2025-Q2 | 57 | 5 | 21,053.00 | 3 | 0 | 3 | 504.5 |
| 2025-Q3 | 61 | 8 | 57,922.00 | 3 | 0 | 2 | 476.8 |
| 2025-Q4 | 62 | 2 | 21,100.00 | 1 | 0 | 2 | 559.0 |
| 2026-Q1 | 18 | 3 | 4,676.00 | 1 | 0 | 3 | 237.3 |
| 2026-Q2 | 7 | 1 | 2,135.00 | 0 | 0 | 4 | 111.5 |
| 2026-Q3 | 22 | 1 | 7,220.00 | 1 | 0 | 2 | 196.5 |
| 2026-Q4 * | 1 | 0 | — | 0 | 0 | 1 | 14.0 |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
75.1100-3
Regular Safety and Health Inspection · 14.0 on-site hours
Compliance Follow-up Inspection · 6.0 on-site hours
STEPPING OR KNEELING ON OBJECT · DAYS AWAY FROM WORK ONLY
Accident narrative
While Place changing miner, employee stepped on a piece of coal twisting EE's ankle.
77.1110 · $226.00 proposed
77.512 · $288.00 proposed
77.512 · $151.00 proposed
41.20 · $151.00 proposed
75.1731(a) · $288.00 proposed
75.400 · $592.00 proposed
77.502 · $151.00 proposed
75.370(a)(1) · $151.00 proposed
75.222(a) · $288.00 proposed
75.202(a) · S&S · $1,431.00 proposed
75.1913(b) · $288.00 proposed
75.1731(a) · $288.00 proposed
75.400 · $592.00 proposed
77.1101(c) · $288.00 proposed
75.403 · $226.00 proposed
75.403 · $226.00 proposed
75.403 · $226.00 proposed
71.206(a) · $226.00 proposed
75.1101-7(c) · $226.00 proposed
75.220(a)(1) · $226.00 proposed
75.333(h) · $465.00 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.
Quarterly receipts and quality
| Quarter | Short tons | Heat · Btu/lb | Sulfur % | Ash % | Delivered USD/ton | |
|---|---|---|---|---|---|---|
| 2025-Q3 * | 219,623 | 10,559 | 1.14 | 14.40 | 87.13 | |
| 2025-Q4 | 228,250 | 11,053 | 1.00 | 12.42 | 85.56 | |
| 2026-Q1 | 149,915 | 11,840 | 0.38 | 10.38 | 87.49 | |
| 2026-Q2 | 63,823 | 11,782 | 0.84 | 9.79 | 88.99 |
| Month / source | Receiving plant / supplier | Short tons | Delivered USD/ton | Heat · Btu/lb | Sulfur % | Ash % | Purchase | Transport |
|---|---|---|---|---|---|---|---|---|
| 2026-06EIA row 10537 · preliminary | Huntington8069 · UT · WOLVERINE FUELS LLC. | 1,070 | 90.37 | 12,664 | 0.51 | 9.00 | ContractBIT | Truck |
| 2026-05EIA row 8650 · preliminary | Huntington8069 · UT · WOLVERINE FUELS LLC. | 39,375 | 89.64 | 11,528 | 1.13 | 10.40 | ContractBIT | Truck |
| 2026-04EIA row 6872 · preliminary | Huntington8069 · UT · WOLVERINE FUELS LLC. | 23,378 | 87.83 | 12,172 | 0.37 | 8.80 | ContractBIT | Truck |
| 2026-03EIA row 5041 · preliminary | Huntington8069 · UT · SKYLINE MINE | 6,157 | 87.51 | 11,771 | 0.44 | 9.10 | ContractBIT | Truck |
| 2026-02EIA row 3139 · preliminary | Huntington8069 · UT · SKYLINE MINE | 35,556 | 87.14 | 11,994 | 0.36 | 9.00 | ContractBIT | Truck |
| 2026-01EIA row 1164 · preliminary | Huntington8069 · UT · SKYLINE MINE | 108,202 | 87.60 | 11,793 | 0.39 | 10.90 | ContractBIT | Truck |
| 2025-12EIA row 35467 · final | Huntington8069 · UT · SKYLINE MINE | 69,373 | 85.43 | 12,016 | 0.44 | 9.50 | ContractBIT | Truck |
| 2025-11EIA row 32452 · final | Huntington8069 · UT · SUFCO | 41,058 | 82.85 | 10,749 | 1.15 | 12.80 | ContractBIT | Truck |
| 2025-10EIA row 29512 · final | Huntington8069 · UT · SKYLINE MINE | 117,819 | 86.58 | 10,593 | 1.27 | 14.00 | ContractBIT | Truck |
| 2025-09EIA row 26460 · final | Huntington8069 · UT · SKYLINE MINE | 103,721 | 86.75 | 10,660 | 1.21 | 13.90 | ContractBIT | Truck |
| 2025-08EIA row 22832 · final | Intermountain Power Project6481 · UT · WOLVERINE FUELS LLC. | 2,340 | 76.08 | 11,393 | 0.81 | 12.40 | ContractBIT | Rail |
| 2025-08EIA row 23368 · final | 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 |
|---|---|---|---|---|---|
| Skyline Mine #34201566 · Carbon, Utah | 2,963,808 | — | — | — | County sales or price not published1 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.
OWNERSHIP
Operator and controller history
Current ownership comes from MSHA Mines. Historical start and end dates come from MSHA Controller and Operator History.
—
Wolverine Fuels LLCcontrolsCanyon Fuel Company LLCoperatesSKYLINE MINE #3
msha-controller-operator-history · controller/operator co-tenure derived on mine 4201566—
Arch Resources InccontrolsCanyon Fuel Company LLCoperatesSKYLINE MINE #3
msha-controller-operator-history · controller/operator co-tenure derived on mine 4201566—
El Paso Energy CorpcontrolsUtah Fuel CompanyoperatesSKYLINE MINE #3
msha-controller-operator-history · controller/operator co-tenure derived on mine 4201566Other historical summaries · source-specific periods
RECORD SUMMARY
Production, safety and enforcement
These summaries use the periods stated on each card, independently of the reporting period above.
01 / SAFETYwatch
Accidents and injuries
214 historical accident/injury rows; 1 coded fatalities and 4,045 lost days across the published record.
ACCIDENT + INJURY RECORD58 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
4,214 violation rows across the full record; 656 carry an S&S flag and $2,887,939 appears in current assessed amounts.
ENFORCEMENT ACTIVITY1,492 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
16,491 coal dust; 688 coal quartz; 840 noise. 0 personal-sample rows have a published C/E ratio above 1; 139 noise rows have an action-level or PEL dose above 100%. These are separate measures, not a silica exceedance count. Silica results and sample status are shown separately.
OCCUPATIONAL EXPOSURE18K samples
coal-dust-samplesquartz-samplesnoise-samples04 / PRODUCTIONcontext
Quarterly production and employment
49K employee hours and 96 summed average employees across reported subunits in the latest published quarter.
2026-Q236K tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
121 contested-violation rows, 146 civil-penalty docket/decision rows, and 114 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE381 linked rows
conferencescontested-violationscivil-penalty-dockets-decisions06 / CONTRACTORScontext
Contractors
Contractors are linked through this mine’s violation or accident records. Their production and hours cover all their operations, so they are not included in this mine’s totals.
ENTITY-LEVEL CONTEXT23 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
491 inspection events and 63K published inspection hours across the historical record.
OVERSIGHT COVERAGE113 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 688 silica records across the mine’s published history.
Coal quartz concentration
Quarterly mean · µg/m³ · not-voided samples
— No eligible measurements. * Quarter in progress. Means describe the available samples, not average exposure across the mine.
Quartz % is the sample’s quartz content; µg/m³ is its reported concentration. Personal C/E is the ratio to the limit published with that sample. Personal and area concentration units and void status are not specified in those source files.
| Date / sample | Dataset / analyte | Occupation / area | Measurement | Sample status | Published action |
|---|---|---|---|---|---|
| 58542293 / lab 2026027883 | Coal quartzQuartz | ROOF BOLTER (TWIN HEAD) (RETURN SIDE)NON DESIGNATED OCCUPATION | 18 µg/m³5.7% quartz | Not voided | Not reported |
| 58542603 / lab 2026027886 | Coal quartzQuartz | CONTINUOUS MINER OPERATORDESIGNATED OCCUPATION | 15 µg/m³4.1% quartz | Not voided | Not reported |
| 58538305 / lab 2026024918 | Coal quartzQuartz | OCCUPATION CODE NOT FOUNDDESIGNATED AREA | 10 µg/m³4.1% quartz | Not voided | Not reported |
| 58538418 / lab 2026024917 | Coal quartzQuartz | CONTINUOUS MINER OPERATORDESIGNATED OCCUPATION | 87 µg/m³19.5% quartz | Not voided | Not reported |
| 58538408 / lab 2026024913 | Coal quartzQuartz | ROOF BOLTER (TWIN HEAD) (RETURN SIDE)NON DESIGNATED OCCUPATION | 33 µg/m³12% quartz | Not voided | Not reported |
| 58516125 / lab 2026002144 | Coal quartzQuartz | CONTINUOUS MINER OPERATORDESIGNATED OCCUPATION | 3 µg/m³1% quartz | Not voided | Not reported |
| 58516101 / lab 2026002151 | Coal quartzQuartz | ROOF BOLTER (TWIN HEAD) (RETURN SIDE)NON DESIGNATED OCCUPATION | 5 µg/m³1.3% quartz | Not voided | Not reported |
| 58516145 / lab 2026001071 | Coal quartzQuartz | CONTINUOUS MINER OPERATORDESIGNATED OCCUPATION | 2 µg/m³0.8% quartz | Not voided | Not reported |
Sources and interpretation
- Coal means use numeric concentrations from samples marked not voided, excluding control/invalid sample types and dates after the snapshot. Missing values remain null; reported zeroes remain zero.
- Quarterly means describe available samples, not mine-wide or worker-average exposure. Quarters with no eligible measurements remain empty; the current quarter is partial.
- Personal C/E is MSHA's published concentration-to-limit ratio. A value above 1 is not by itself a citation or a determination under the 2024 silica rule. Personal and area files do not publish a void-status field.
- Area records include bulk-dust analyses and are kept separate from personal exposure results. Their concentration units are not specified in the source dictionary.
- Missing samples do not establish safe conditions. Coal quartz percentage and concentration are separate measures. No compliance threshold is inferred for coal samples.
Coal quartz field definitions ↗Metal/nonmetal personal field definitions ↗Metal/nonmetal area field definitions ↗
EIA + TITLE 30
EIA production and cited regulations
EIA annual figures are reported separately from MSHA. Regulation links use the current eCFR snapshot.
ANNUAL COAL PRODUCTION2,963,808short tons
- LABOR HOURS
- 876,795
- AVG EMPLOYEES
- 414
- SUPPLY REGION
- Uinta Region
- UNION
- No union code published
- OPERATION
- Mine only
- COMPANY TYPE
- Operating Subsidiary
1 published EIA row aggregated under this MSHA ID. Components remain available in JSON.
30 CFR 75.1100-3Condition and examination of firefighting equipment.1 recent row ↗30 CFR 77.1110Examination and maintenance of firefighting equipment.1 recent row ↗30 CFR 77.512Inspection and cover plates.2 recent rows ↗30 CFR 41.20Legal identity report.1 recent row ↗30 CFR 75.1731Maintenance of belt conveyors and belt conveyor entries.1 recent row ↗30 CFR 75.400Accumulation of combustible materials.1 recent row ↗30 CFR 77.502Electric equipment; examination, testing, and maintenance.1 recent row ↗30 CFR 75.370Mine ventilation plan; submission and approval.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
503095475.1100-3Citation
503204477.1110Citation
503204377.512Citation
503204277.512Citation
503204141.20Citation
503703075.1731(a)Citation
503702975.400Citation
503204077.502Citation
Coal dust, noise and other contaminants. Silica records above ↑
Coal dustCONTINUOUS MINER OPERATOR
.026 mg/m³Voided · INVALID PRODUCTION
Coal dustCONTINUOUS MINER OPERATOR
14.613 mg/m³Voided
Coal dustCONTINUOUS MINER OPERATOR
.108 mg/m³Voided · INVALID PRODUCTION
Coal dustOCCUPATION CODE NOT FOUND
.101 mg/m³Not voided
Coal dustOCCUPATION CODE NOT FOUND
.064 mg/m³Not voided
Coal dustOCCUPATION CODE NOT FOUND
.774 mg/m³Not voided
Coal dustOCCUPATION CODE NOT FOUND
1.466 mg/m³Not voided
Coal dustOCCUPATION CODE NOT FOUND
.078 mg/m³Voided
SOURCE COVERAGE
Reporting dates and coverage
17 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors214Feb 6, 2000—Aug 20, 2026mine-keyed
Addresses of Recordidentity · logistics1Dec 27, 2023—Dec 27, 2023mine-keyed
Assessed Violationscompliance · legal4,149Jan 4, 2000—Aug 11, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal146May 25, 2000—Aug 18, 2026mine-keyed
Coal Dust Sampleshealth · safety16,491Jan 3, 2000—Oct 7, 2026mine-keyed
Conferencescompliance · legal114Apr 26, 2001—Jul 7, 2026mine-keyed
Contested Violationscompliance · legal121Apr 9, 2001—Jul 1, 2025mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety4,046Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety817Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance3Jan 1, 1979—Dec 20, 1996mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance412Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance82Not published—Not publishedmine-keyed
Inspectionssafety · compliance491Jan 3, 2000—Oct 1, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety—No published rowsabsent / not applicable
Metal and Nonmetal Personal Health Sampleshealth · safety—No published rowsabsent / not applicable
Noise Sampleshealth · safety · equipment840Apr 18, 2001—Aug 17, 2026mine-keyed
Quartz Samples — Coalhealth · safety688Jan 19, 2000—Jul 8, 2026mine-keyed
Violationscompliance · safety · legal4,214Jan 4, 2000—Oct 7, 2026mine-keyed
107(a) Orders Issuedsafety · compliance—No published rowsabsent / not applicable
NOTES
Limitations
- Contractor production is entity-level and is never represented as mine-attributable.
- Missing rows can mean no event, publication delay, identity mismatch, or inapplicability.