# West Elk Mine

- **MSHA mine ID:** 0503672
- **Status:** Active
- **Type / commodity:** Underground / Coal (Bituminous)
- **Location:** Gunnison, CO
- **Operator:** Mountain Coal Company, L.L.C.
- **Controller:** Core Natural Resources Inc
- **Public source rows linked:** 43,738
- **Source coverage:** 17 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Core Natural Resources Inc (0189840) → Mountain Coal Company, L.L.C. (P24204) → West Elk Mine (0503672)**

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

## Controller and operator valid-time history

- **Atlantic Richfield Company → Mountain Coal Company:** 1981-04-01 through 1998-03-22; derived from co-tenure at mine 0503672; source `msha-controller-operator-history`.
- **Arch Resources Inc → Mountain Coal Company, L.L.C.:** 1998-03-23 through 2025-01-13; derived from co-tenure at mine 0503672; source `msha-controller-operator-history`.
- **Core Natural Resources Inc → Mountain Coal Company, L.L.C.:** 2025-01-14 through current/open; derived from co-tenure at mine 0503672; source `msha-controller-operator-history`.

- History rows: 3
- Typed edges: 8
- 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 — 55 since 2021:** Accidents and injuries 413 historical accident/injury rows; 2 coded fatalities and 7,660 lost days across the published record.
2. **COMPLIANCE — 1,391 since 2021:** Violations and penalties 6,903 violation rows across the full record; 1,012 carry an S&S flag and $4,338,613 appears in current assessed amounts.
3. **HEALTH — 16K samples:** Occupational health samples 14,961 coal dust; 654 coal quartz; 814 noise. 0 personal-sample rows have a published C/E ratio above 1; 262 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 — 1.5M tons:** Quarterly production and employment 139K employee hours and 276 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 1,355 linked rows:** Contests, conferences and decisions 545 contested-violation rows, 593 civil-penalty docket/decision rows, and 217 conference records linked by issuance number.
6. **CONTRACTORS — 45 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 — 497 since 2021:** Inspections 2,430 inspection events and 97K published inspection hours across the historical record.

## EIA annual operating context

- **Reporting year:** 2024
- **Production:** 3,705,019 short tons
- **Labor hours:** 652,830
- **Average employees:** 323
- **Coal supply region:** Uinta Region
- **Union code:** Not published
- **Published rows under this MSHA ID:** 1

## Recent Title 30 crosswalk

Snapshot current through 2026-08-19.

- **30 CFR 75.400 — Accumulation of combustible materials.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-E/section-75.400
- **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 75.1403 — Other safeguards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-O/section-75.1403
- **30 CFR 75.370 — Mine ventilation plan; submission and approval.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-D/section-75.370
- **30 CFR 75.1913 — Starting aids.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-T/section-75.1913
- **30 CFR 75.1104 — Underground storage, lubricating oil and grease.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-L/section-75.1104
- **30 CFR 75.1910 — Nonpermissible diesel-powered equipment; electrical system design and performance requirements.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-T/section-75.1910
- **30 CFR 75.807 — Installation of high-voltage transmission cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-I/section-75.807

## Source coverage

- **Accident, Injuries, and Illnesses:** 413 rows; 2000-01-11 through 2026-08-11; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2002-04-19 through 2002-04-19; source ID `msha-addresses`
- **Assessed Violations:** 6,738 rows; 2000-01-12 through 2026-09-01; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 593 rows; 2000-04-24 through 2026-09-04; source ID `msha-civil-penalty-dockets-decisions`
- **Coal Dust Samples:** 14,961 rows; 2000-01-06 through 2026-10-07; source ID `msha-coal-dust-samples`
- **Conferences:** 217 rows; 2000-03-09 through 2026-03-16; source ID `msha-conferences`
- **Contested Violations:** 545 rows; 2003-01-28 through 2026-06-24; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 7,477 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 1,509 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 1981-04-01 through 1998-03-23; source ID `msha-controller-operator-history`
- **Inspections:** 2,430 rows; 2000-01-04 through 2026-10-07; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 381 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 98 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 814 rows; 2001-02-27 through 2026-07-28; source ID `msha-noise-samples`
- **Quartz Samples — Coal:** 654 rows; 2000-08-20 through 2026-07-28; source ID `msha-quartz-samples`
- **Violations:** 6,903 rows; 2000-01-12 through 2026-10-08; 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/west-elk-mine-0503672`
- JSON: `/api/v1/mines/west-elk-mine-0503672`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0503672/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0503672/relationships`
- MCP resource: `mine://0503672/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`