# Bridger Underground Coal Mine

- **MSHA mine ID:** 4801646
- **Status:** Abandoned and Sealed
- **Type / commodity:** Underground / Coal (Bituminous)
- **Location:** Sweetwater, WY
- **Operator:** Bridger Coal Company
- **Controller:** MidAmerican Energy Holdings Company; IDACORP
- **Public source rows linked:** 20,319
- **Source coverage:** 17 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**MidAmerican Energy Holdings Company; IDACORP (C00514) → Bridger Coal Company (P00648) → Bridger Underground Coal Mine (4801646)**

Current identity source: `msha-mines`. This is a current snapshot, not a historical claim.

## Controller and operator valid-time history

- **IDACORP et al → Bridger Coal Company:** 2004-07-15 through current/open; derived from co-tenure at mine 4801646; source `msha-controller-operator-history`.
- **MidAmerican Energy Holdings Company et al → Bridger Coal Company:** 2004-07-15 through current/open; derived from co-tenure at mine 4801646; source `msha-controller-operator-history`.

- History rows: 2
- Typed edges: 4
- Interval anomalies: 0
- Valid-time bounds: inclusive; date granularity; null end means open-ended in the upstream history row; not independent proof of present control.
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00.

## Assessment signals

1. **SAFETY — 5 since 2021:** Accidents and injuries 241 historical accident/injury rows; 2 coded fatalities and 6,817 lost days across the published record.
2. **COMPLIANCE — 54 since 2021:** Violations and penalties 2,610 violation rows across the full record; 364 carry an S&S flag and $1,720,820 appears in current assessed amounts.
3. **HEALTH — 8K samples:** Occupational health samples 7,202 coal dust; 284 coal quartz; 505 noise. 0 personal-sample rows have a published C/E ratio above 1; 105 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.
4. **PRODUCTION — 0 tons:** Quarterly production and employment 965 employee hours and 3 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 908 linked rows:** Contests, conferences and decisions 417 contested-violation rows, 416 civil-penalty docket/decision rows, and 75 conference records linked by issuance number.
6. **CONTRACTORS — 21 linked entities:** 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.
7. **INSPECTIONS — 5 since 2021:** Inspections 196 inspection events and 35K published inspection hours across the historical record.

## EIA annual operating context

No matched record in the 2024 EIA coal-public workbook. This may be inapplicable for a non-coal operation.

## Recent Title 30 crosswalk

Snapshot current through 2026-08-19.

- **30 CFR 50.20-7 — Criteria—MSHA Form 7000-1, Section D.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-C/section-50.20-7
- **30 CFR 75.321 — Air quality.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-D/section-75.321
- **30 CFR 75.342 — Methane monitors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-D/section-75.342
- **30 CFR 75.1725 — Machinery and equipment; operation and maintenance.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-R/section-75.1725
- **30 CFR 75.1719-4 — Mining machines, cap lamps; requirements.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-R/section-75.1719-4
- **30 CFR 75.400 — Accumulation of combustible materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-E/section-75.400
- **30 CFR 75.1106-3 — Storage of liquefied and nonliquefied compressed gas cylinders; requirements.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-L/section-75.1106-3
- **30 CFR 75.1722 — Mechanical equipment guards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-R/section-75.1722
- **30 CFR 75.1909 — Nonpermissible diesel-powered equipment; design and performance requirements.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-T/section-75.1909
- **30 CFR 77.404 — Machinery and equipment; operation and maintenance.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-E/section-77.404
- **30 CFR 77.502 — Electric equipment; examination, testing, and maintenance.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-F/section-77.502
- **30 CFR 75.380 — Escapeways; bituminous and lignite mines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-D/section-75.380

## Source coverage

- **Accident, Injuries, and Illnesses:** 241 rows; 2004-10-06 through 2021-10-31; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2024-04-15 through 2024-04-15; source ID `msha-addresses`
- **Assessed Violations:** 2,563 rows; 2004-11-16 through 2022-06-03; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 416 rows; 2007-05-08 through 2022-05-23; source ID `msha-civil-penalty-dockets-decisions`
- **Coal Dust Samples:** 7,202 rows; 2004-10-20 through 2022-04-12; source ID `msha-coal-dust-samples`
- **Conferences:** 75 rows; 2005-08-25 through 2021-11-10; source ID `msha-conferences`
- **Contested Violations:** 417 rows; 2005-12-10 through 2021-07-10; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 4,718 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 882 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 2 rows; 2004-07-15 through 2004-07-15; source ID `msha-controller-operator-history`
- **Inspections:** 196 rows; 2004-02-17 through 2022-05-18; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 167 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 39 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 505 rows; 2004-12-15 through 2021-09-16; source ID `msha-noise-samples`
- **Quartz Samples — Coal:** 284 rows; 2005-02-23 through 2021-10-26; source ID `msha-quartz-samples`
- **Violations:** 2,610 rows; 2004-11-16 through 2022-06-03; source ID `msha-violations`

## Caveats

- This is public-record decision support, not legal advice or an official MSHA record.
- Missing data can indicate no event, publication delay, an unresolved identity, or inapplicability.
- Contractor production data is entity-level and is not attributed to this mine.

## Alternate representations

- HTML: `/mines/bridger-underground-coal-mine-4801646`
- JSON: `/api/v1/mines/bridger-underground-coal-mine-4801646`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4801646/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4801646/relationships`
- MCP resource: `mine://4801646/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`