# LEER MINE

- **MSHA mine ID:** 4609192
- **Status:** Active
- **Type / commodity:** Underground / Coal (Bituminous)
- **Location:** Taylor, WV
- **Operator:** ICG TYGART VALLEY
- **Controller:** Core Natural Resources Inc
- **Public source rows linked:** 36,596
- **Source coverage:** 17 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Core Natural Resources Inc (0189840) → ICG TYGART VALLEY (0078004) → LEER MINE (4609192)**

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

## Controller and operator valid-time history

- **International Coal Group Inc (ICG) → ICG Tygart Valley:** 2007-01-23 through 2011-06-14; derived from co-tenure at mine 4609192; source `msha-controller-operator-history`.
- **Arch Resources Inc → ICG Tygart Valley:** 2011-06-15 through 2025-01-13; derived from co-tenure at mine 4609192; source `msha-controller-operator-history`.
- **Core Natural Resources Inc → ICG Tygart Valley:** 2025-01-14 through current/open; derived from co-tenure at mine 4609192; source `msha-controller-operator-history`.

- History rows: 3
- Typed edges: 7
- 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 — 57 since 2021:** Accidents and injuries 139 historical accident/injury rows; 3 coded fatalities and 6,919 lost days across the published record.
2. **COMPLIANCE — 1,119 since 2021:** Violations and penalties 4,213 violation rows across the full record; 901 carry an S&S flag and $2,530,419 appears in current assessed amounts.
3. **HEALTH — 19K samples:** Occupational health samples 17,908 coal dust; 605 coal quartz; 600 noise. 0 personal-sample rows have a published C/E ratio above 1; 158 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 — 915K tons:** Quarterly production and employment 262K employee hours and 437 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 1,607 linked rows:** Contests, conferences and decisions 713 contested-violation rows, 713 civil-penalty docket/decision rows, and 181 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 — 593 since 2021:** Inspections 1,495 inspection events and 60K published inspection hours across the historical record.

## EIA annual operating context

- **Reporting year:** 2024
- **Production:** 3,650,142 short tons
- **Labor hours:** 1,323,744
- **Average employees:** 520
- **Coal supply region:** Appalachia Northern
- **Union code:** Not published
- **Published rows under this MSHA ID:** 1

## Recent Title 30 crosswalk

Snapshot current through 2026-08-19.

- **30 CFR 75.333 — Ventilation controls.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-D/section-75.333
- **30 CFR 75.1403-6 — Criteria—Self-propelled personnel carriers.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-O/section-75.1403-6
- **30 CFR 75.363 — Hazardous conditions and violations of mandatory health or safety standards; posting, correcting, and recording.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-D/section-75.363
- **30 CFR 75.1403 — Other safeguards.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-O/section-75.1403
- **30 CFR 75.1002 — Installation of electric equipment and conductors; permissibility.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-K/section-75.1002
- **30 CFR 75.1107-16 — Inspection of fire suppression devices.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-L/section-75.1107-16
- **30 CFR 75.220 — Roof control plan.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-C/section-75.220
- **30 CFR 75.403 — Maintenance of incombustible content of rock dust.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-E/section-75.403
- **30 CFR 75.1600-2 — Communication facilities; working sections; installation and maintenance requirements; audible or visual alarms.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-Q/section-75.1600-2

## Source coverage

- **Accident, Injuries, and Illnesses:** 139 rows; 2011-04-11 through 2026-09-19; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2026-08-13 through 2026-08-13; source ID `msha-addresses`
- **Assessed Violations:** 4,156 rows; 2008-10-30 through 2026-08-27; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 713 rows; 2012-10-05 through 2026-09-17; source ID `msha-civil-penalty-dockets-decisions`
- **Coal Dust Samples:** 17,908 rows; 2010-03-09 through 2026-10-08; source ID `msha-coal-dust-samples`
- **Conferences:** 181 rows; 2012-03-22 through 2026-09-24; source ID `msha-conferences`
- **Contested Violations:** 713 rows; 2011-03-23 through 2026-07-29; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 4,524 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 1,018 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 2007-01-23 through 2007-01-23; source ID `msha-controller-operator-history`
- **Inspections:** 1,495 rows; 2008-10-29 through 2026-10-07; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 277 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 49 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 600 rows; 2010-08-03 through 2026-02-24; source ID `msha-noise-samples`
- **Quartz Samples — Coal:** 605 rows; 2010-07-21 through 2026-09-01; source ID `msha-quartz-samples`
- **Violations:** 4,213 rows; 2008-10-30 through 2026-10-07; 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/leer-mine-4609192`
- JSON: `/api/v1/mines/leer-mine-4609192`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4609192/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4609192/relationships`
- MCP resource: `mine://4609192/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`