# Kemmerer Mine

- **MSHA mine ID:** 4800086
- **Status:** Active
- **Type / commodity:** Surface / Coal (Bituminous)
- **Location:** Lincoln, WY
- **Operator:** Kemmerer Operations, LLC
- **Controller:** Kemmerer Holdings LLC
- **Public source rows linked:** 11,909
- **Source coverage:** 17 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Kemmerer Holdings LLC (0149381) → Kemmerer Operations, LLC (0165033) → Kemmerer Mine (4800086)**

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

## Controller and operator valid-time history

- **Lincoln Corporation → Kemmerer Coal Company:** 1971-08-01 through 1981-09-08; derived from co-tenure at mine 4800086; source `msha-controller-operator-history`.
- **Chevron Corporation → Chevron Mining Inc:** 1981-09-09 through 2012-01-31; derived from co-tenure at mine 4800086; source `msha-controller-operator-history`.
- **Westmoreland Coal Company → Westmoreland Kemmerer, LLC:** 2012-02-01 through 2019-06-19; derived from co-tenure at mine 4800086; source `msha-controller-operator-history`.
- **Kemmerer Holdings LLC → Kemmerer Operations, LLC:** 2019-06-20 through current/open; derived from co-tenure at mine 4800086; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 12
- 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 — 32 since 2021:** Accidents and injuries 197 historical accident/injury rows; 0 coded fatalities and 4,545 lost days across the published record.
2. **COMPLIANCE — 140 since 2021:** Violations and penalties 1,389 violation rows across the full record; 215 carry an S&S flag and $989,498 appears in current assessed amounts.
3. **HEALTH — 849 samples:** Occupational health samples 620 coal dust; 38 coal quartz; 191 noise. 0 personal-sample rows have a published C/E ratio above 1; 5 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 — 215K tons:** Quarterly production and employment 70K employee hours and 153 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 931 linked rows:** Contests, conferences and decisions 412 contested-violation rows, 429 civil-penalty docket/decision rows, and 90 conference records linked by issuance number.
6. **CONTRACTORS — 31 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 — 62 since 2021:** Inspections 323 inspection events and 17K published inspection hours across the historical record.

## EIA annual operating context

- **Reporting year:** 2024
- **Production:** 2,417,282 short tons
- **Labor hours:** 393,973
- **Average employees:** 223
- **Coal supply region:** Western
- **Union code:** United Mine Workers Of America
- **Published rows under this MSHA ID:** 1

## Recent Title 30 crosswalk

Snapshot current through 2026-08-19.

- **30 CFR 77.400 — Mechanical equipment guards.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-E/section-77.400
- **30 CFR 77.502 — Electric equipment; examination, testing, and maintenance.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-F/section-77.502
- **30 CFR 47.41 — Requirement for container labels.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.41
- **30 CFR 77.410 — Mobile equipment; automatic warning devices.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-E/section-77.410
- **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 77.206 — Ladders; construction; installation and maintenance.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-C/section-77.206
- **30 CFR 77.205 — Travelways at surface installations.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-C/section-77.205
- **30 CFR 77.404 — Machinery and equipment; operation and maintenance.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-E/section-77.404

## Source coverage

- **Accident, Injuries, and Illnesses:** 197 rows; 2000-02-07 through 2026-08-25; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1951-05-01 through 1951-05-01; source ID `msha-addresses`
- **Assessed Violations:** 1,375 rows; 2000-01-25 through 2025-12-15; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 429 rows; 2000-09-05 through 2026-04-21; source ID `msha-civil-penalty-dockets-decisions`
- **Coal Dust Samples:** 620 rows; 2000-03-14 through 2026-09-16; source ID `msha-coal-dust-samples`
- **Conferences:** 90 rows; 2000-05-04 through 2022-06-07; source ID `msha-conferences`
- **Contested Violations:** 412 rows; 2004-02-03 through 2025-07-30; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 5,413 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 1,052 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1971-08-01 through 2019-06-20; source ID `msha-controller-operator-history`
- **Inspections:** 323 rows; 2000-01-25 through 2026-09-14; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 298 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 76 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 191 rows; 2001-01-05 through 2026-09-16; source ID `msha-noise-samples`
- **Quartz Samples — Coal:** 38 rows; 2001-07-24 through 2025-09-02; source ID `msha-quartz-samples`
- **Violations:** 1,389 rows; 2000-01-25 through 2026-09-16; 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/kemmerer-mine-4800086`
- JSON: `/api/v1/mines/kemmerer-mine-4800086`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4800086/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4800086/relationships`
- MCP resource: `mine://4800086/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`