# Decker Mine

- **MSHA mine ID:** 2400839
- **Status:** Active
- **Type / commodity:** Surface / Coal (Bituminous)
- **Location:** Big Horn, MT
- **Operator:** Decker Coal Company
- **Controller:** Lighthouse Resources Inc
- **Public source rows linked:** 5,236
- **Source coverage:** 17 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Lighthouse Resources Inc (0117761) → Decker Coal Company (P02385) → Decker Mine (2400839)**

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

## Controller and operator valid-time history

- **Ambre Energy Limited et al → Decker Coal Company:** 1950-01-01 through 2014-09-24; derived from co-tenure at mine 2400839; source `msha-controller-operator-history`.
- **Cloud Peak Energy et al → Decker Coal Company:** 1950-01-01 through 2014-09-24; derived from co-tenure at mine 2400839; source `msha-controller-operator-history`.
- **Ambre Energy Limited → Decker Coal Company:** 2014-09-25 through 2015-04-12; derived from co-tenure at mine 2400839; source `msha-controller-operator-history`.
- **Lighthouse Resources Inc → Decker Coal Company:** 2015-04-13 through current/open; derived from co-tenure at mine 2400839; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 8
- 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 — 4 since 2021:** Accidents and injuries 91 historical accident/injury rows; 0 coded fatalities and 2,566 lost days across the published record.
2. **COMPLIANCE — 27 since 2021:** Violations and penalties 389 violation rows across the full record; 76 carry an S&S flag and $237,695 appears in current assessed amounts.
3. **HEALTH — 710 samples:** Occupational health samples 480 coal dust; 27 coal quartz; 203 noise. 0 personal-sample rows have a published C/E ratio above 1; 31 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 11K employee hours and 21 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 68 linked rows:** Contests, conferences and decisions 25 contested-violation rows, 25 civil-penalty docket/decision rows, and 18 conference records linked by issuance number.
6. **CONTRACTORS — 16 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 — 16 since 2021:** Inspections 126 inspection events and 6K 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 77.1103 — Flammable liquids; storage.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-L/section-77.1103
- **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 77.704-8 — Protective equipment; testing and storage.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-H/section-77.704-8
- **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 77.1607 — 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 77.502 — Electric equipment; examination, testing, and maintenance.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-F/section-77.502
- **30 CFR 77.502-2 — Electric equipment; frequency of examination and testing.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-F/section-77.502-2

## Source coverage

- **Accident, Injuries, and Illnesses:** 91 rows; 2000-01-05 through 2026-02-02; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1972-09-01 through 1972-09-01; source ID `msha-addresses`
- **Assessed Violations:** 387 rows; 2000-09-25 through 2026-08-27; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 25 rows; 2010-09-30 through 2019-10-22; source ID `msha-civil-penalty-dockets-decisions`
- **Coal Dust Samples:** 480 rows; 2000-01-19 through 2026-09-02; source ID `msha-coal-dust-samples`
- **Conferences:** 18 rows; 2012-11-13 through 2019-10-31; source ID `msha-conferences`
- **Contested Violations:** 25 rows; 2009-06-17 through 2019-04-19; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 2,579 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 498 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1950-01-01 through 1950-01-01; source ID `msha-controller-operator-history`
- **Inspections:** 126 rows; 2000-01-19 through 2026-08-24; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 307 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 75 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 203 rows; 2000-05-23 through 2026-09-02; source ID `msha-noise-samples`
- **Quartz Samples — Coal:** 27 rows; 2000-01-19 through 2026-09-02; source ID `msha-quartz-samples`
- **Violations:** 389 rows; 2000-09-25 through 2026-08-27; 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/decker-mine-2400839`
- JSON: `/api/v1/mines/decker-mine-2400839`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/2400839/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/2400839/relationships`
- MCP resource: `mine://2400839/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`