# Cordero Rojo Mine

- **MSHA mine ID:** 4800992
- **Status:** Active
- **Type / commodity:** Surface / Coal (Bituminous)
- **Location:** Campbell, WY
- **Operator:** Navajo Transitional Energy Company, LLC
- **Controller:** Navajo Transitional Energy Company LLC
- **Public source rows linked:** 9,195
- **Source coverage:** 17 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Navajo Transitional Energy Company LLC (0164461) → Navajo Transitional Energy Company, LLC (0131153) → Cordero Rojo Mine (4800992)**

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

## Controller and operator valid-time history

- **Sunoco, Inc. → Cordero Mining Company:** 1974-11-27 through 1993-06-03; derived from co-tenure at mine 4800992; source `msha-controller-operator-history`.
- **RTZ-CRA Group → Cordero Mining LLC:** 1993-06-04 through 2009-11-19; derived from co-tenure at mine 4800992; source `msha-controller-operator-history`.
- **Cloud Peak Energy Resources LLC → Cordero Mining LLC:** 2009-11-20 through 2019-10-24; derived from co-tenure at mine 4800992; 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 4800992; 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 4800992; 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: 2026-10-13T11:19:05.459773+00:00.

## Assessment signals

1. **SAFETY — 17 since 2021:** Accidents and injuries 155 historical accident/injury rows; 0 coded fatalities and 2,374 lost days across the published record.
2. **COMPLIANCE — 94 since 2021:** Violations and penalties 507 violation rows across the full record; 116 carry an S&S flag and $217,358 appears in current assessed amounts.
3. **HEALTH — 1K samples:** Occupational health samples 767 coal dust; 36 coal quartz; 212 noise. 0 personal-sample rows have a published C/E ratio above 1; 34 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 — 2.6M tons:** Quarterly production and employment 148K employee hours and 300 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 16 linked rows:** Contests, conferences and decisions 5 contested-violation rows, 5 civil-penalty docket/decision rows, and 6 conference records linked by issuance number.
6. **CONTRACTORS — 30 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 — 24 since 2021:** Inspections 152 inspection events and 11K published inspection hours across the historical record.

## EIA annual operating context

- **Reporting year:** 2024
- **Production:** 4,314,678 short tons
- **Labor hours:** 460,384
- **Average employees:** 248
- **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 77.502 — Electric equipment; examination, testing, and maintenance.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-F/section-77.502
- **30 CFR 77.216 — Water, sediment, or slurry impoundments and impounding structures; general.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-C/section-77.216
- **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 77.1607 — Loading and haulage equipment; operation.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-Q/section-77.1607
- **30 CFR 77.1001 — Stripping; loose material.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-K/section-77.1001
- **30 CFR 50.12 — Preservation of evidence.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-B/section-50.12
- **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
- **30 CFR 77.1104 — Accumulations of combustible materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-L/section-77.1104
- **30 CFR 47.44 — Temporary, portable containers.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.44

## Source coverage

- **Accident, Injuries, and Illnesses:** 155 rows; 2000-01-09 through 2026-08-12; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2016-05-20 through 2016-05-20; source ID `msha-addresses`
- **Assessed Violations:** 497 rows; 2000-05-24 through 2026-08-10; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 5 rows; unknown through unknown; source ID `msha-civil-penalty-dockets-decisions`
- **Coal Dust Samples:** 767 rows; 2000-01-05 through 2026-08-17; source ID `msha-coal-dust-samples`
- **Conferences:** 6 rows; 2005-04-14 through 2026-03-26; source ID `msha-conferences`
- **Contested Violations:** 5 rows; 2026-01-12 through 2026-02-04; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 5,358 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 1,154 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 1974-11-27 through 2019-10-25; source ID `msha-controller-operator-history`
- **Inspections:** 152 rows; 2000-01-04 through 2026-09-04; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 268 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 66 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 212 rows; 2000-05-23 through 2026-01-06; source ID `msha-noise-samples`
- **Quartz Samples — Coal:** 36 rows; 2000-01-05 through 2026-08-17; source ID `msha-quartz-samples`
- **Violations:** 507 rows; 2000-05-24 through 2026-08-10; 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/cordero-rojo-mine-4800992`
- JSON: `/api/v1/mines/cordero-rojo-mine-4800992`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4800992/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4800992/relationships`
- MCP resource: `mine://4800992/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`