# Antelope Coal Mine

- **MSHA mine ID:** 4801337
- **Status:** Active
- **Type / commodity:** Surface / Coal (Bituminous)
- **Location:** Converse, WY
- **Operator:** Navajo Transitional Energy Company, LLC
- **Controller:** Navajo Transitional Energy Company LLC
- **Public source rows linked:** 9,879
- **Source coverage:** 17 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Navajo Transitional Energy Company LLC (0164461) → Navajo Transitional Energy Company, LLC (0131153) → Antelope Coal Mine (4801337)**

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

## Controller and operator valid-time history

- **MidAmerican Energy Holdings Company → Antelope Coal Company:** 1980-12-01 through 1993-06-01; derived from co-tenure at mine 4801337; source `msha-controller-operator-history`.
- **RTZ-CRA Group → Antelope Coal LLC:** 1993-06-02 through 2009-11-19; derived from co-tenure at mine 4801337; source `msha-controller-operator-history`.
- **Cloud Peak Energy Resources LLC → Antelope Coal LLC:** 2009-11-20 through 2019-10-24; derived from co-tenure at mine 4801337; source `msha-controller-operator-history`.
- **Navajo Nation → Navajo Transitional Energy Company, LLC:** 2019-10-25 through 2019-10-24; derived from co-tenure at mine 4801337; source `msha-controller-operator-history`.
- **Navajo Transitional Energy Company LLC → Navajo Transitional Energy Company, LLC:** 2019-10-25 through current/open; derived from co-tenure at mine 4801337; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 13
- 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 — 10 since 2021:** Accidents and injuries 127 historical accident/injury rows; 0 coded fatalities and 2,450 lost days across the published record.
2. **COMPLIANCE — 87 since 2021:** Violations and penalties 480 violation rows across the full record; 95 carry an S&S flag and $176,831 appears in current assessed amounts.
3. **HEALTH — 1K samples:** Occupational health samples 889 coal dust; 58 coal quartz; 220 noise. 0 personal-sample rows have a published C/E ratio above 1; 24 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 — 7.1M tons:** Quarterly production and employment 133K employee hours and 251 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 17 linked rows:** Contests, conferences and decisions 5 contested-violation rows, 5 civil-penalty docket/decision rows, and 7 conference records linked by issuance number.
6. **CONTRACTORS — 34 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 — 18 since 2021:** Inspections 163 inspection events and 12K published inspection hours across the historical record.

## EIA annual operating context

- **Reporting year:** 2024
- **Production:** 14,984,446 short tons
- **Labor hours:** 766,248
- **Average employees:** 390
- **Coal supply region:** Powder River Basin
- **Union code:** Not published
- **Published rows under this MSHA ID:** 1

## Recent Title 30 crosswalk

Snapshot current through 2026-08-19.

- **30 CFR 77.1104 — Accumulations of combustible materials.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-L/section-77.1104
- **30 CFR 77.1605 — Loading and haulage equipment; installations.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-Q/section-77.1605
- **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 77.1713 — Daily inspection of surface coal mine; certified person; reports of inspection.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-R/section-77.1713
- **30 CFR 77.505 — Cable fittings; suitability.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-F/section-77.505
- **30 CFR 77.1110 — Examination and maintenance of firefighting equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-L/section-77.1110
- **30 CFR 77.512 — Inspection and cover plates.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-F/section-77.512
- **30 CFR 77.502-2 — Electric equipment; frequency of examination and testing.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-F/section-77.502-2
- **30 CFR 77.1607 — Loading and haulage equipment; operation.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-Q/section-77.1607
- **30 CFR 50.10 — Immediate notification.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-B/section-50.10

## Source coverage

- **Accident, Injuries, and Illnesses:** 127 rows; 2000-01-18 through 2026-09-08; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1985-12-03 through 1985-12-03; source ID `msha-addresses`
- **Assessed Violations:** 465 rows; 2000-04-06 through 2026-05-26; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 5 rows; 2009-04-30 through 2026-06-11; source ID `msha-civil-penalty-dockets-decisions`
- **Coal Dust Samples:** 889 rows; 2000-02-03 through 2026-09-09; source ID `msha-coal-dust-samples`
- **Conferences:** 7 rows; 2001-10-18 through 2023-10-26; source ID `msha-conferences`
- **Contested Violations:** 5 rows; 2007-01-16 through 2025-04-29; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 6,066 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 1,290 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 1980-12-01 through 2019-10-25; source ID `msha-controller-operator-history`
- **Inspections:** 163 rows; 2000-04-03 through 2026-10-05; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 36 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 61 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 220 rows; 2001-04-10 through 2026-04-29; source ID `msha-noise-samples`
- **Quartz Samples — Coal:** 58 rows; 2004-11-15 through 2026-05-05; source ID `msha-quartz-samples`
- **Violations:** 480 rows; 2000-04-06 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/antelope-coal-mine-4801337`
- JSON: `/api/v1/mines/antelope-coal-mine-4801337`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4801337/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4801337/relationships`
- MCP resource: `mine://4801337/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`