MINE DETAILS
Jim Bridger Mine
MSHA MINE ID4800677
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Jim Bridger Mine41.79972, -108.61639Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-13. MSHA quarterly production and employment reports.
Coal production
3,683,459reported short tons
Hours worked
648,252reported employee hours
Tons per hour
5.68production ÷ 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 | 520,741 | 113,335 | 4.59 | 220 | 1/1 mines reporting |
| 2025 Q2 | 501,174 | 114,679 | 4.37 | 233 | 1/1 mines reporting |
| 2025 Q3 | 871,125 | 109,549 | 7.95 | 212 | 1/1 mines reporting |
| 2025 Q4 | 762,474 | 105,427 | 7.23 | 212 | 1/1 mines reporting |
| 2026 Q1 | 580,204 | 104,628 | 5.55 | 209 | 1/1 mines reporting |
| 2026 Q2 | 447,741 | 100,634 | 4.45 | 206 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
102 significant & substantial (S&S)
Accident records
60 records classified as fatality
Proposed penalties · USD
3,918.0010 of 10 violations with amounts
On-site inspection hours
545.7514 inspections · 14 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 | 0 | 0 | — | 1 | 0 | 2 | 29.5 |
| 2025-Q2 | 0 | 0 | — | 2 | 0 | 1 | 12.8 |
| 2025-Q3 | 5 | 0 | 755.00 | 0 | 0 | 3 | 151.3 |
| 2025-Q4 | 0 | 0 | — | 1 | 0 | 2 | 137.5 |
| 2026-Q1 | 0 | 0 | — | 1 | 0 | 1 | 39.0 |
| 2026-Q2 | 5 | 2 | 3,163.00 | 0 | 0 | 1 | 143.3 |
| 2026-Q3 | 0 | 0 | — | 1 | 0 | 3 | 32.5 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 1 | 0.0 |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
Spot Inspection · 0.0 on-site hours
Spot Inspection · 14.5 on-site hours
MACHINERY · DAYS AWAY FROM WORK ONLY
Accident narrative
The technician was changing the cutting bit on a vertical mill. When released the collets fall so you need to hold them. when EE went to release the bit EE hit the wrong button and turned the mill on catching EE's glove and pulling EE's hand into the rotating bit. EE received 21 stitches and a fractured bone.
Spot Inspection · 12.5 on-site hours
Verbal Hazard Complaint Inspections · 5.5 on-site hours
77.502 · S&S · $398.00 proposed
47.41(a) · $151.00 proposed
47.44(b) · $151.00 proposed
47.42(b) · $151.00 proposed
77.410(a)(1) · S&S · $2,312.00 proposed
Regular Safety and Health Inspection · 143.3 on-site hours
HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY
Accident narrative
High winds blew the doors on the back of the Drag Line house open. The employee and two others decided to close the doors. They successfully closed the right door and were attempting to close the left door when a gust of wind hit the door and flung it open blowing all three of them back with the door. The employee was pinched between the door and the guarding around the Gen-set.
Spot Inspection · 39.0 on-site hours
Spot Inspection · 26.5 on-site hours
Regular Safety and Health Inspection · 111.0 on-site hours
MACHINERY · DAYS AWAY FROM WORK ONLY
Accident narrative
The 103 Dragline at Ramp 53 contacted the cable handler #768 and was struck by the left rear house of the dragline while the dragline was in full swing. As a result, the cable handler was tipped onto its side. The cable handler operator was transported to the Dr. Office for further medical evaluation. On 10/13/25 the MRI confirmed that the employee would need surgery.
Spot Inspection · 25.3 on-site hours
Spot Inspection · 12.0 on-site hours
47.41(a) · $151.00 proposed
77.208(a) · $151.00 proposed
77.904 · $151.00 proposed
77.507 · $151.00 proposed
77.1109(a) · $151.00 proposed
Regular Safety and Health Inspection · 114.0 on-site hours
Spot Inspection · 12.8 on-site hours
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 * | 576,869 | 9,111 | 0.65 | 11.51 | 59.91 | |
| 2025-Q4 | 863,207 | 9,149 | 0.63 | 11.83 | 52.65 | |
| 2026-Q1 | 529,584 | 9,193 | 0.59 | 10.97 | 50.00 | |
| 2026-Q2 | 239,298 | 9,121 | 0.56 | 11.05 | 64.28 | |
| 2026-Q3 * | 253,364 | 9,329 | 0.60 | 10.40 | 67.00 |
| Month / source | Receiving plant / supplier | Short tons | Delivered USD/ton | Heat · Btu/lb | Sulfur % | Ash % | Purchase | Transport |
|---|---|---|---|---|---|---|---|---|
| 2026-07EIA row 12478 · preliminary | Jim Bridger8066 · WY · JIM BRIDGER | 253,364 | 67.00 | 9,329 | 0.60 | 10.40 | ContractSUB | Tram/conveyor |
| 2026-06EIA row 10530 · preliminary | Jim Bridger8066 · WY · JIM BRIDGER | 88,844 | 67.00 | 9,037 | 0.56 | 11.40 | ContractSUB | Tram/conveyor |
| 2026-05EIA row 8643 · preliminary | Jim Bridger8066 · WY · JIM BRIDGER | 69,070 | 67.00 | 9,133 | 0.52 | 11.00 | ContractSUB | Tram/conveyor |
| 2026-04EIA row 6866 · preliminary | Jim Bridger8066 · WY · JIM BRIDGER | 81,384 | 59.00 | 9,202 | 0.58 | 10.70 | ContractSUB | Tram/conveyor |
| 2026-03EIA row 5035 · preliminary | Jim Bridger8066 · WY · JIM BRIDGER | 75,148 | 59.00 | 9,035 | 0.56 | 11.90 | ContractSUB | Tram/conveyor |
| 2026-02EIA row 3133 · preliminary | Jim Bridger8066 · WY · JIM BRIDGER | 212,497 | 59.00 | 9,274 | 0.58 | 10.50 | ContractSUB | Tram/conveyor |
| 2026-01EIA row 1157 · preliminary | Jim Bridger8066 · WY · JIM BRIDGER | 241,939 | 39.31 | 9,171 | 0.60 | 11.10 | ContractSUB | Tram/conveyor |
| 2025-12EIA row 35460 · final | Jim Bridger8066 · WY · JIM BRIDGER | 224,021 | 38.83 | 9,060 | 0.70 | 12.30 | ContractSUB | Tram/conveyor |
| 2025-11EIA row 32447 · final | Jim Bridger8066 · WY · JIM BRIDGER | 421,898 | 57.49 | 9,182 | 0.60 | 11.40 | ContractSUB | Tram/conveyor |
| 2025-10EIA row 29507 · final | Jim Bridger8066 · WY · JIM BRIDGER | 217,288 | 57.50 | 9,176 | 0.61 | 12.20 | ContractSUB | Tram/conveyor |
| 2025-09EIA row 26455 · final | Jim Bridger8066 · WY · JIM BRIDGER | 269,997 | 57.52 | 9,075 | 0.67 | 12.20 | ContractSUB | Tram/conveyor |
| 2025-08EIA row 23363 · final | Jim Bridger8066 · WY · JIM BRIDGER | 306,872 | 62.01 | 9,143 | 0.64 | 10.90 | ContractSUB | Tram/conveyor |
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 |
|---|---|---|---|---|---|
| Jim Bridger Mine4800677 · Sweetwater, Wyoming | 2,850,457 | — | — | — | County sales or price not published2 eligible mines / 2 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.
—
MidAmerican Energy Holdings Company et alcontrolsBridger Coal CompanyoperatesJim Bridger Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 4800677—
IDACORP et alcontrolsBridger Coal CompanyoperatesJim Bridger Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 4800677Other 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
139 historical accident/injury rows; 2 coded fatalities and 1,986 lost days across the published record.
ACCIDENT + INJURY RECORD13 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
514 violation rows across the full record; 77 carry an S&S flag and $246,158 appears in current assessed amounts.
ENFORCEMENT ACTIVITY23 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
929 coal dust; 45 coal quartz; 288 noise. 0 personal-sample rows have a published C/E ratio above 1; 12 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 EXPOSURE1K samples
coal-dust-samplesquartz-samplesnoise-samples04 / PRODUCTIONcontext
Quarterly production and employment
101K employee hours and 206 summed average employees across reported subunits in the latest published quarter.
2026-Q2448K tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
42 contested-violation rows, 45 civil-penalty docket/decision rows, and 20 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE107 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 CONTEXT21 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
173 inspection events and 13K published inspection hours across the historical record.
OVERSIGHT COVERAGE27 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 45 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 |
|---|---|---|---|---|---|
| 58000884 / lab 2026036446 | Coal quartzQuartz | SUPPLY MANPART 90 MINER | 0 µg/m³0.9% quartz | Not voided | Not reported |
| 58134782 / lab 2026010859 | Coal quartzQuartz | SUPPLY MANPART 90 MINER | 0 µg/m³—% 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 PRODUCTION2,850,457short tons
- LABOR HOURS
- 449,937
- AVG EMPLOYEES
- 221
- SUPPLY REGION
- Western
- UNION
- Western Energy Workers
- OPERATION
- Mine only
- COMPANY TYPE
- Operating Subsidiary
1 published EIA row aggregated under this MSHA ID. Components remain available in JSON.
30 CFR 77.502Electric equipment; examination, testing, and maintenance.1 recent row ↗30 CFR 47.41Requirement for container labels.2 recent rows ↗30 CFR 47.44Temporary, portable containers.1 recent row ↗30 CFR 47.42Label contents.1 recent row ↗30 CFR 77.410Mobile equipment; automatic warning devices.2 recent rows ↗30 CFR 77.208Storage of materials.1 recent row ↗30 CFR 77.904Identification of circuit breakers.1 recent row ↗30 CFR 77.507Electric equipment; switches.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
505165577.502S&S
505165447.41(a)Citation
505805347.44(b)Citation
505746147.42(b)Citation
990497077.410(a)(1)S&S
505802747.41(a)Citation
990494577.208(a)Citation
505154577.904Citation
Coal dust, noise and other contaminants. Silica records above ↑
NoiseBULLDOZER OPERATOR
PEL dose: 2%Action-level dose: 29%
NoiseHIGHWALL DRILL OPERATOR
PEL dose: 2%Action-level dose: 8%
Coal dustSUPPLY MAN
.045 mg/m³Not voided
Coal dustSUPPLY MAN
.026 mg/m³Not voided
Coal dustHIGHWALL DRILL OPERATOR
.006 mg/m³Not voided
Coal dustBULLDOZER OPERATOR
.192 mg/m³Not voided
Coal dustHIGHWALL DRILL OPERATOR
.001 mg/m³Not voided
Coal dustSUPPLY MAN
.02 mg/m³Not voided
SOURCE COVERAGE
Reporting dates and coverage
17 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors139Feb 2, 2000—Sep 4, 2026mine-keyed
Addresses of Recordidentity · logistics1Jul 1, 1974—Jul 1, 1974mine-keyed
Assessed Violationscompliance · legal508Jan 13, 2000—May 12, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal45Mar 28, 2001—Feb 18, 2022mine-keyed
Coal Dust Sampleshealth · safety929Jan 24, 2000—Oct 4, 2026mine-keyed
Conferencescompliance · legal20Apr 18, 2000—Oct 8, 2021mine-keyed
Contested Violationscompliance · legal42Nov 5, 2007—Apr 28, 2026mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety4,299Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety818Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance2Jan 1, 1950—Jan 1, 1950mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance212Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance54Not published—Not publishedmine-keyed
Inspectionssafety · compliance173Jan 7, 2000—Oct 6, 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 · equipment288Feb 1, 2000—Oct 6, 2026mine-keyed
Quartz Samples — Coalhealth · safety45Jan 24, 2000—Aug 26, 2026mine-keyed
Violationscompliance · safety · legal514Jan 13, 2000—May 12, 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.