# Big Sky

- **MSHA mine ID:** 2400108
- **Status:** Abandoned
- **Type / commodity:** Surface / Coal (Bituminous)
- **Location:** Rosebud, MT
- **Operator:** Big Sky Coal Company
- **Controller:** Peabody Energy Corporation
- **Public source rows linked:** 311
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Peabody Energy Corporation (C15833) → Big Sky Coal Company (P24170) → Big Sky (2400108)**

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

## Controller and operator valid-time history

- **Kennecott Copper Corp → Peabody Coal Company:** 1950-01-01 through 1977-06-30; derived from co-tenure at mine 2400108; source `msha-controller-operator-history`.
- **Hanson PLC → Big Sky Coal Company:** 1977-07-01 through 1998-05-18; derived from co-tenure at mine 2400108; source `msha-controller-operator-history`.
- **Peabody Energy Corporation → Big Sky Coal Company:** 1998-05-19 through current/open; derived from co-tenure at mine 2400108; source `msha-controller-operator-history`.

- History rows: 3
- Typed edges: 9
- 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 5 historical accident/injury rows; 0 coded fatalities and 77 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 27 violation rows across the full record; 6 carry an S&S flag and $2,996 appears in current assessed amounts.
3. **HEALTH — 77 samples:** Occupational health samples 50 coal dust; 27 noise. 0 personal-sample rows have a published C/E ratio above 1; 3 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 660 employee hours and 1 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 0 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
6. **CONTRACTORS — 1 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 43 inspection events and 676 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 77.410 — 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 77.1104 — 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 77.1110 — 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 77.400 — Mechanical equipment guards.** (3 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 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 77.205 — Travelways at surface installations.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-C/section-77.205

## Source coverage

- **Accident, Injuries, and Illnesses:** 5 rows; 2000-07-12 through 2004-04-28; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2008-01-30 through 2008-01-30; source ID `msha-addresses`
- **Assessed Violations:** 25 rows; 2000-05-16 through 2004-03-01; source ID `msha-assessed-violations`
- **Coal Dust Samples:** 50 rows; 2000-05-16 through 2004-07-28; source ID `msha-coal-dust-samples`
- **Contractor Employment and Production — Quarterly:** 11 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 2 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 1950-01-01 through 1998-05-19; source ID `msha-controller-operator-history`
- **Inspections:** 43 rows; 2000-05-11 through 2008-03-06; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 99 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 17 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 27 rows; 2000-05-16 through 2005-07-26; source ID `msha-noise-samples`
- **Violations:** 27 rows; 2000-05-16 through 2004-04-28; 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/big-sky-2400108`
- JSON: `/api/v1/mines/big-sky-2400108`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/2400108/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/2400108/relationships`
- MCP resource: `mine://2400108/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`