# Mountaineer II Mine

- **MSHA mine ID:** 4609029
- **Status:** Active
- **Type / commodity:** Underground / Coal (Bituminous)
- **Location:** Logan, WV
- **Operator:** Mingo Logan Coal LLC
- **Controller:** Core Natural Resources Inc
- **Public source rows linked:** 48,162
- **Source coverage:** 16 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Core Natural Resources Inc (0189840) → Mingo Logan Coal LLC (P21148) → Mountaineer II Mine (4609029)**

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

## Controller and operator valid-time history

- **Ashland Inc et al → Mingo Logan Coal LLC:** 2004-03-25 through 1996-06-30; derived from co-tenure at mine 4609029; source `msha-controller-operator-history`.
- **Arch Resources Inc → Mingo Logan Coal LLC:** 2004-03-25 through 2025-01-13; derived from co-tenure at mine 4609029; source `msha-controller-operator-history`.
- **Core Natural Resources Inc → Mingo Logan Coal LLC:** 2025-01-14 through current/open; derived from co-tenure at mine 4609029; source `msha-controller-operator-history`.

- History rows: 3
- Typed edges: 7
- Interval anomalies: 1
- 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 — 51 since 2021:** Accidents and injuries 366 historical accident/injury rows; 4 coded fatalities and 20,519 lost days across the published record.
2. **COMPLIANCE — 2,361 since 2021:** Violations and penalties 7,378 violation rows across the full record; 1,563 carry an S&S flag and $5,357,619 appears in current assessed amounts.
3. **HEALTH — 20K samples:** Occupational health samples 18,899 coal dust; 725 coal quartz; 678 noise. 0 personal-sample rows have a published C/E ratio above 1; 132 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 — No published quarter:** Quarterly production and employment The source remains registered, but no mine-keyed quarterly production row was published.
5. **LEGAL — 5,204 linked rows:** Contests, conferences and decisions 2,466 contested-violation rows, 2,475 civil-penalty docket/decision rows, and 263 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 — 525 since 2021:** Inspections 1,843 inspection events and 77K published inspection hours across the historical record.

## EIA annual operating context

- **Reporting year:** 2024
- **Production:** 1,102,478 short tons
- **Labor hours:** 828,735
- **Average employees:** 349
- **Coal supply region:** Appalachia Central
- **Union code:** Not published
- **Published rows under this MSHA ID:** 1

## Recent Title 30 crosswalk

Snapshot current through 2026-08-19.

- **30 CFR 75.1731 — Maintenance of belt conveyors and belt conveyor entries.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-R/section-75.1731
- **30 CFR 75.400 — Accumulation of combustible materials.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-E/section-75.400
- **30 CFR 75.601-1 — Short circuit protection; ratings and settings of circuit breakers.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-G/section-75.601-1
- **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 75.604 — Permanent splicing of trailing cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-G/section-75.604
- **30 CFR 75.1505 — Escapeway maps.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-P/section-75.1505
- **30 CFR 75.351 — Atmospheric monitoring systems.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-D/section-75.351
- **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
- **30 CFR 75.1002 — Installation of electric equipment and conductors; permissibility.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-K/section-75.1002
- **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 75.503 — Permissible electric face equipment; maintenance.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-75/subpart-F/section-75.503

## Source coverage

- **Accident, Injuries, and Illnesses:** 366 rows; 2004-12-06 through 2026-08-10; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2006-03-27 through 2006-03-27; source ID `msha-addresses`
- **Assessed Violations:** 7,146 rows; 2004-11-30 through 2026-08-28; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 2,475 rows; 2005-09-06 through 2026-07-13; source ID `msha-civil-penalty-dockets-decisions`
- **Coal Dust Samples:** 18,899 rows; 2006-03-30 through 2026-10-14; source ID `msha-coal-dust-samples`
- **Conferences:** 263 rows; 2005-06-23 through 2026-06-02; source ID `msha-conferences`
- **Contested Violations:** 2,466 rows; 2005-03-14 through 2026-07-29; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 4,896 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 955 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 2004-03-25 through 2004-03-25; source ID `msha-controller-operator-history`
- **Inspections:** 1,843 rows; 2004-08-30 through 2026-10-13; source ID `msha-inspections`
- **Mine Employment and Production — Yearly:** 67 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 678 rows; 2006-04-26 through 2026-09-15; source ID `msha-noise-samples`
- **Quartz Samples — Coal:** 725 rows; 2006-04-12 through 2026-09-01; source ID `msha-quartz-samples`
- **Violations:** 7,378 rows; 2004-11-30 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/mountaineer-ii-mine-4609029`
- JSON: `/api/v1/mines/mountaineer-ii-mine-4609029`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4609029/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4609029/relationships`
- MCP resource: `mine://4609029/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`