MINE DETAILS
Colowyo Mine
MSHA MINE ID0502962
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Colowyo Mine40.29972, -107.78306Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-18. MSHA quarterly production and employment reports.
Coal production
920,029reported short tons
Hours worked
348,505reported employee hours
Tons per hour
2.64production ÷ 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 | 408,832 | 73,551 | 5.56 | 161 | 1/1 mines reporting |
| 2025 Q2 | 263,019 | 65,805 | 4.00 | 153 | 1/1 mines reporting |
| 2025 Q3 | 214,240 | 60,850 | 3.52 | 144 | 1/1 mines reporting |
| 2025 Q4 | 33,938 | 69,726 | 0.49 | 138 | 1/1 mines reporting |
| 2026 Q1 | 0 | 73 | 0.00 | 2 | 1/1 mines reporting |
| 2026 Q2 | 0 | 78,500 | 0.00 | 152 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-18
Violations
130 significant & substantial (S&S)
Accident records
70 records classified as fatality
Proposed penalties · USD
4,740.0013 of 13 violations with amounts
On-site inspection hours
322.508 inspections · 8 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 | 1 | 0 | 151.00 | 1 | 0 | 1 | 105.3 |
| 2025-Q2 | 0 | 0 | — | 4 | 0 | 1 | 83.0 |
| 2025-Q3 | 0 | 0 | — | 1 | 0 | 0 | — |
| 2025-Q4 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q1 | 5 | 0 | 3,532.00 | 0 | 0 | 2 | 68.0 |
| 2026-Q2 | 0 | 0 | — | 0 | 0 | 1 | 6.5 |
| 2026-Q3 | 7 | 0 | 1,057.00 | 1 | 0 | 2 | 52.5 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 1 | 7.3 |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
77.1110 · $151.00 proposed
Regular Safety and Health Inspection · 105.3 on-site hours
HANDTOOLS (NONPOWERED) · DAYS AWAY FROM WORK ONLY
Accident narrative
Production Operator was shoveling mud off the track frame of a dozer while standing on the ground when Operator slipped and fell, landing on left shoulder. X-ray was negative and physician has referred employee for an MRI.
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 * | 141,391 | 9,872 | 0.34 | 8.08 | 80.55 | |
| 2026-Q1 | 136,065 | 9,920 | 0.31 | 6.50 | 81.21 | |
| 2026-Q2 | 360,661 | 9,600 | 0.37 | 9.09 | 78.54 |
| Month / source | Receiving plant / supplier | Short tons | Delivered USD/ton | Heat · Btu/lb | Sulfur % | Ash % | Purchase | Transport |
|---|---|---|---|---|---|---|---|---|
| 2026-06EIA row 10108 · preliminary | Craig (CO)6021 · CO · COLOWYO MINE | 57,742 | 77.96 | 9,552 | 0.38 | 9.40 | ContractSUB | Rail |
| 2026-05EIA row 8262 · preliminary | Craig (CO)6021 · CO · COLOWYO MINE | 128,368 | 77.42 | 9,490 | 0.41 | 10.30 | ContractSUB | Rail |
| 2026-04EIA row 6457 · preliminary | Craig (CO)6021 · CO · COLOWYO MINE | 174,551 | 79.55 | 9,696 | 0.34 | 8.10 | ContractSUB | Rail |
| 2026-03EIA row 4643 · preliminary | Craig (CO)6021 · CO · COLOWYO MINE | 136,065 | 81.21 | 9,920 | 0.31 | 6.50 | ContractSUB | Rail |
| 2025-09EIA row 25742 · final | Craig (CO)6021 · CO · COLOWYO MINE | 37,985 | 78.98 | 9,755 | 0.35 | 9.10 | ContractSUB | Rail |
| 2025-08EIA row 22601 · final | Craig (CO)6021 · CO · COLOWYO MINE | 103,406 | 81.12 | 9,915 | 0.33 | 7.70 | ContractSUB | Rail |
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. All producing annual records in this selection have estimates. 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 |
|---|---|---|---|---|---|
| Colowyo Mine0502962 · Moffat, Colorado | 1,713,919 | 55.97 | 1,728,783 | 96,759,987 | County allocation estimate32.95% of eligible county production4 eligible mines / 4 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.
—
Kiewit Peter Sons' InccontrolsKiewit Mining Group IncoperatesColowyo Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0502962—
Tri-State Generation and Transmission Assn InccontrolsColowyo Coal Company L PoperatesColowyo Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0502962—
Western Fuels Assoc Inc et alcontrolsColowyo Coal Company L PoperatesColowyo Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0502962—
Tri-State Generation & Transmission Assn Inc et alcontrolsColowyo Coal Company L PoperatesColowyo Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0502962—
RTZ-CRA GroupcontrolsColowyo Coal Company L PoperatesColowyo Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0502962—
W R Grace & CompanycontrolsColowyo Coal Company L PoperatesColowyo Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0502962Other 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
114 historical accident/injury rows; 1 coded fatalities and 2,580 lost days across the published record.
ACCIDENT + INJURY RECORD28 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
671 violation rows across the full record; 130 carry an S&S flag and $448,768 appears in current assessed amounts.
ENFORCEMENT ACTIVITY30 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
623 coal dust; 60 coal quartz; 237 noise. 0 personal-sample rows have a published C/E ratio above 1; 8 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 EXPOSURE920 samples
coal-dust-samplesquartz-samplesnoise-samples04 / PRODUCTIONcontext
Quarterly production and employment
79K employee hours and 152 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
41 contested-violation rows, 42 civil-penalty docket/decision rows, and 10 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE93 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 CONTEXT22 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
147 inspection events and 12K published inspection hours across the historical record.
OVERSIGHT COVERAGE24 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 18, 2026. 60 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 |
|---|---|---|---|---|---|
| 58544923 / lab 2026011893 | Coal quartzQuartz | BULLDOZER OPERATORDESIGNATED WORK POSITION | 3 µg/m³3.7% 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 PRODUCTION1,713,919short tons
- LABOR HOURS
- 305,379
- AVG EMPLOYEES
- 184
- SUPPLY REGION
- Uinta Region
- UNION
- No union code published
- OPERATION
- Mine and Preparation Plant
- COMPANY TYPE
- Operating Subsidiary
1 published EIA row aggregated under this MSHA ID. Components remain available in JSON.
30 CFR 77.1102Warning signs; smoking and open flame.1 recent row ↗30 CFR 77.404Machinery and equipment; operation and maintenance.2 recent rows ↗30 CFR 77.1110Examination and maintenance of firefighting equipment.7 recent rows ↗30 CFR 77.502Electric equipment; examination, testing, and maintenance.1 recent row ↗30 CFR 77.502-2Electric equipment; frequency of examination and testing.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
503125677.1102Citation
503125577.404(a)Citation
503125477.1110Citation
503125377.1110Citation
503125277.502Citation
503125177.1110Citation
503125077.404(a)Citation
503191177.1110Citation
Coal dust, noise and other contaminants. Silica records above ↑
Coal dustBULLDOZER OPERATOR
.03 mg/m³Not voided
Coal dustBULLDOZER OPERATOR
.084 mg/m³Not voided
Coal dustBULLDOZER OPERATOR
.035 mg/m³Not voided
Coal dustBULLDOZER OPERATOR
.086 mg/m³Not voided
NoiseBULLDOZER OPERATOR
PEL dose: 2%Action-level dose: 17%
NoiseBULLDOZER OPERATOR
PEL dose: 1%Action-level dose: 16%
Coal dustBULLDOZER OPERATOR
.167 mg/m³Voided · DISCARDED SAMPLE (TOO OLD)
Coal dustBULLDOZER OPERATOR
.031 mg/m³Not voided
SOURCE COVERAGE
Reporting dates and coverage
17 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors114May 15, 2000—Sep 12, 2026mine-keyed
Addresses of Recordidentity · logistics1Jul 20, 2026—Jul 20, 2026mine-keyed
Assessed Violationscompliance · legal664May 10, 2000—Aug 5, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal42May 1, 2002—Jan 14, 2022mine-keyed
Coal Dust Sampleshealth · safety623Jan 5, 2000—Sep 23, 2026mine-keyed
Conferencescompliance · legal10May 15, 2001—Jan 11, 2013mine-keyed
Contested Violationscompliance · legal41Dec 19, 2007—Jun 3, 2021mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety5,428Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety1,078Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance6Oct 1, 1976—Jan 5, 2026mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance360Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance81Not published—Not publishedmine-keyed
Inspectionssafety · compliance147Mar 20, 2000—Oct 8, 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 · equipment237Apr 3, 2000—Jul 22, 2026mine-keyed
Quartz Samples — Coalhealth · safety60Mar 21, 2000—Mar 5, 2026mine-keyed
Violationscompliance · safety · legal671May 10, 2000—Aug 5, 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.