# Spring Creek Mine

- **MSHA mine ID:** 2401457
- **Status:** Active
- **Type / commodity:** Surface / Coal (Bituminous)
- **Location:** Big Horn, MT
- **Operator:** Navajo Transitional Energy Company, LLC
- **Controller:** Navajo Transitional Energy Company LLC
- **Public source rows linked:** 7,356
- **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) → Spring Creek Mine (2401457)**

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

## Controller and operator valid-time history

- **MidAmerican Energy Holdings Company → Spring Creek Coal Company:** 1979-01-01 through 1993-06-01; derived from co-tenure at mine 2401457; source `msha-controller-operator-history`.
- **RTZ-CRA Group → Spring Creek Coal LLC:** 1993-06-02 through 2009-11-19; derived from co-tenure at mine 2401457; source `msha-controller-operator-history`.
- **Cloud Peak Energy Resources LLC → Spring Creek Coal LLC:** 2009-11-20 through 2019-10-24; derived from co-tenure at mine 2401457; 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 2401457; 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 2401457; 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 — 19 since 2021:** Accidents and injuries 62 historical accident/injury rows; 2 coded fatalities and 933 lost days across the published record.
2. **COMPLIANCE — 83 since 2021:** Violations and penalties 277 violation rows across the full record; 57 carry an S&S flag and $158,458 appears in current assessed amounts.
3. **HEALTH — 1K samples:** Occupational health samples 760 coal dust; 61 coal quartz; 208 noise. 0 personal-sample rows have a published C/E ratio above 1; 18 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 — 2.3M tons:** Quarterly production and employment 60K employee hours and 123 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 24 linked rows:** Contests, conferences and decisions 8 contested-violation rows, 8 civil-penalty docket/decision rows, and 8 conference records linked by issuance number.
6. **CONTRACTORS — 25 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 — 26 since 2021:** Inspections 112 inspection events and 7K published inspection hours across the historical record.

## EIA annual operating context

- **Reporting year:** 2024
- **Production:** 13,053,955 short tons
- **Labor hours:** 535,544
- **Average employees:** 265
- **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 77.400 — 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 77.204 — Openings in surface installations; safeguards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-C/section-77.204
- **30 CFR 77.107-1 — Plans for training programs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-B/section-77.107-1
- **30 CFR 77.404 — Machinery and equipment; operation and maintenance.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-E/section-77.404
- **30 CFR 77.1110 — Examination and maintenance of firefighting equipment.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-L/section-77.1110
- **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 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 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

## Source coverage

- **Accident, Injuries, and Illnesses:** 62 rows; 2000-02-08 through 2025-10-28; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1980-12-12 through 1980-12-12; source ID `msha-addresses`
- **Assessed Violations:** 274 rows; 2000-05-04 through 2026-08-30; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 8 rows; 2007-08-30 through 2016-06-01; source ID `msha-civil-penalty-dockets-decisions`
- **Coal Dust Samples:** 760 rows; 2000-01-14 through 2026-09-03; source ID `msha-coal-dust-samples`
- **Conferences:** 8 rows; 2002-05-09 through 2024-03-29; source ID `msha-conferences`
- **Contested Violations:** 8 rows; 2007-03-14 through 2015-01-27; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 4,561 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 919 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 1979-01-01 through 2019-10-25; source ID `msha-controller-operator-history`
- **Inspections:** 112 rows; 2000-03-06 through 2026-08-24; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 29 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 62 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 208 rows; 2000-05-11 through 2026-09-03; source ID `msha-noise-samples`
- **Quartz Samples — Coal:** 61 rows; 2001-06-06 through 2024-11-14; source ID `msha-quartz-samples`
- **Violations:** 277 rows; 2000-05-04 through 2026-08-30; 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/spring-creek-mine-2401457`
- JSON: `/api/v1/mines/spring-creek-mine-2401457`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/2401457/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/2401457/relationships`
- MCP resource: `mine://2401457/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`