# Medicine Bow Mine

- **MSHA mine ID:** 4800900
- **Status:** Abandoned
- **Type / commodity:** Surface / Coal (Bituminous)
- **Location:** Carbon, WY
- **Operator:** Arch Of Wyoming LLC
- **Controller:** Arch Resources Inc
- **Public source rows linked:** 2,180
- **Source coverage:** 16 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Arch Resources Inc (C15561) → Arch Of Wyoming LLC (P17880) → Medicine Bow Mine (4800900)**

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

## Controller and operator valid-time history

- **Arch Mineral Corp & Rocky Mountain Energy → Medicine Bow Coal Company:** 1974-02-01 through 1989-02-28; derived from co-tenure at mine 4800900; source `msha-controller-operator-history`.
- **Ashland Inc et al → Arch Of Wyoming LLC:** 1989-03-01 through 2006-04-04; derived from co-tenure at mine 4800900; source `msha-controller-operator-history`.
- **Arch Resources Inc → Arch Of Wyoming LLC:** 2006-04-05 through current/open; derived from co-tenure at mine 4800900; 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 — 0 since 2021:** Accidents and injuries 7 historical accident/injury rows; 0 coded fatalities and 122 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 88 violation rows across the full record; 14 carry an S&S flag and $13,459 appears in current assessed amounts.
3. **HEALTH — 107 samples:** Occupational health samples 61 coal dust; 14 coal quartz; 32 noise. 0 personal-sample rows have a published C/E ratio above 1; 6 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 2K employee hours and 3 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 7 linked rows:** Contests, conferences and decisions 3 contested-violation rows, 4 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
6. **CONTRACTORS — 7 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 — 0 since 2021:** Inspections 36 inspection events and 972 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 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 77.1605 — Loading and haulage equipment; installations.** (4 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-Q/section-77.1605
- **30 CFR 77.1710 — Protective clothing; requirements.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-R/section-77.1710
- **30 CFR 77.410 — Mobile equipment; automatic warning devices.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-E/section-77.410
- **30 CFR 62.130 — Permissible exposure level.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-M/part-62/section-62.130
- **30 CFR 77.401 — Stationary grinding machines; protective devices.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-E/section-77.401
- **30 CFR 77.516 — Electric wiring and equipment; installation and maintenance.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-F/section-77.516
- **30 CFR 47.31 — Requirement for a HazCom program.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-D/section-47.31
- **30 CFR 77.403 — Mobile equipment; falling object protective structures (FOPS).** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-E/section-77.403

## Source coverage

- **Accident, Injuries, and Illnesses:** 7 rows; 2000-04-05 through 2005-11-17; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2006-06-23 through 2006-06-23; source ID `msha-addresses`
- **Assessed Violations:** 87 rows; 2000-05-23 through 2005-11-28; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2001-10-02 through 2006-03-23; source ID `msha-civil-penalty-dockets-decisions`
- **Coal Dust Samples:** 61 rows; 2000-02-03 through 2004-10-21; source ID `msha-coal-dust-samples`
- **Contested Violations:** 3 rows; 2005-09-29 through 2005-09-29; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,474 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 305 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 1974-02-01 through 1989-03-01; source ID `msha-controller-operator-history`
- **Inspections:** 36 rows; 2000-01-24 through 2006-06-21; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 52 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 12 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 32 rows; 2001-07-12 through 2005-09-29; source ID `msha-noise-samples`
- **Quartz Samples — Coal:** 14 rows; 2000-08-30 through 2003-10-22; source ID `msha-quartz-samples`
- **Violations:** 88 rows; 2000-05-23 through 2005-11-28; 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/medicine-bow-mine-4800900`
- JSON: `/api/v1/mines/medicine-bow-mine-4800900`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4800900/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4800900/relationships`
- MCP resource: `mine://4800900/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`