# Leer South Mine

- **MSHA mine ID:** 4604168
- **Status:** Active
- **Type / commodity:** Underground / Coal (Bituminous)
- **Location:** Barbour, WV
- **Operator:** Wolf Run Mining LLC
- **Controller:** Core Natural Resources Inc
- **Public source rows linked:** 58,787
- **Source coverage:** 17 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Core Natural Resources Inc (0189840) → Wolf Run Mining LLC (P23768) → Leer South Mine (4604168)**

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

## Controller and operator valid-time history

- **Republic Steel Corp → Kitt Energy Corp:** 1973-11-01 through 1982-05-31; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **British Petroleum Company PLC → Kitt Energy Corp:** 1982-06-01 through 1987-03-24; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **Fay E  Leydig → Philippi Mining Company:** 1987-03-25 through 1990-07-16; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **Anker Group Inc → Anker West Virginia Mining Company Inc:** 1990-07-17 through 1999-05-31; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **Rex  Fought → Wayne Processing Inc:** 1999-06-01 through 2001-04-01; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **Anker Group Inc → Anker West Virginia Mining Company Inc:** 2001-04-02 through 2001-06-14; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **Jimmie R  Ryan et al → Ryanstone Coal Llc:** 2001-06-15 through 2002-06-06; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **Anker Group Inc → Wolf Run Mining LLC:** 2002-06-07 through 2005-05-31; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **International Coal Group Inc (ICG) → Anker West Virginia Mining Company Inc:** 2005-06-01 through 1999-05-31; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **International Coal Group Inc (ICG) → Anker West Virginia Mining Company Inc:** 2005-06-01 through 2001-06-14; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **International Coal Group Inc (ICG) → Wolf Run Mining LLC:** 2005-06-01 through 2011-06-14; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **Arch Resources Inc → Anker West Virginia Mining Company Inc:** 2011-06-15 through 1999-05-31; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **Arch Resources Inc → Anker West Virginia Mining Company Inc:** 2011-06-15 through 2001-06-14; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **Arch Resources Inc → Wolf Run Mining LLC:** 2011-06-15 through 2025-01-13; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **Core Natural Resources Inc → Anker West Virginia Mining Company Inc:** 2025-01-14 through 1999-05-31; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **Core Natural Resources Inc → Anker West Virginia Mining Company Inc:** 2025-01-14 through 2001-06-14; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.
- **Core Natural Resources Inc → Wolf Run Mining LLC:** 2025-01-14 through current/open; derived from co-tenure at mine 4604168; source `msha-controller-operator-history`.

- History rows: 17
- Typed edges: 34
- Interval anomalies: 6
- 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 107 since 2021:** Accidents and injuries 604 historical accident/injury rows; 2 coded fatalities and 9,200 lost days across the published record.
2. **COMPLIANCE — 2,178 since 2021:** Violations and penalties 7,834 violation rows across the full record; 2,073 carry an S&S flag and $6,367,622 appears in current assessed amounts.
3. **HEALTH — 32K samples:** Occupational health samples 30,426 coal dust; 987 coal quartz; 937 noise. 0 personal-sample rows have a published C/E ratio above 1; 355 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 7K employee hours and 19 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 2,776 linked rows:** Contests, conferences and decisions 944 contested-violation rows, 945 civil-penalty docket/decision rows, and 887 conference records linked by issuance number.
6. **CONTRACTORS — 23 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 — 625 since 2021:** Inspections 2,433 inspection events and 96K published inspection hours across the historical record.

## EIA annual operating context

- **Reporting year:** 2024
- **Production:** 2,556,403 short tons
- **Labor hours:** 1,419,009
- **Average employees:** 554
- **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 75.503 — Permissible electric face equipment; maintenance.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-F/section-75.503
- **30 CFR 75.370 — Mine ventilation plan; submission and approval.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-D/section-75.370
- **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 75.517 — Power wires and cables; insulation and protection.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-F/section-75.517
- **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 75.1722 — 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 75.809 — Identification of circuit breakers and disconnecting switches.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-I/section-75.809
- **30 CFR 75.360 — Preshift examination at fixed intervals.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-D/section-75.360
- **30 CFR 75.371 — Mine ventilation plan; contents.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-D/section-75.371

## Source coverage

- **Accident, Injuries, and Illnesses:** 604 rows; 2000-01-03 through 2026-09-09; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2007-01-11 through 2007-01-11; source ID `msha-addresses`
- **Assessed Violations:** 7,720 rows; 2000-01-05 through 2026-09-11; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 945 rows; 2001-12-18 through 2026-10-13; source ID `msha-civil-penalty-dockets-decisions`
- **Coal Dust Samples:** 30,426 rows; 2000-01-05 through 2026-10-14; source ID `msha-coal-dust-samples`
- **Conferences:** 887 rows; 2000-02-01 through 2026-02-26; source ID `msha-conferences`
- **Contested Violations:** 944 rows; 2006-01-17 through 2026-07-20; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 4,069 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 889 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 17 rows; 1973-11-01 through 2002-06-07; source ID `msha-controller-operator-history`
- **Inspections:** 2,433 rows; 2000-01-03 through 2026-10-13; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 38 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 55 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 937 rows; 2000-03-21 through 2026-03-20; source ID `msha-noise-samples`
- **Quartz Samples — Coal:** 987 rows; 2000-02-08 through 2026-08-21; source ID `msha-quartz-samples`
- **Violations:** 7,834 rows; 2000-01-05 through 2026-10-14; 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-south-mine-4604168`
- JSON: `/api/v1/mines/leer-south-mine-4604168`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4604168/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4604168/relationships`
- MCP resource: `mine://4604168/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`