# Big Branch

- **MSHA mine ID:** 4407103
- **Status:** Abandoned
- **Type / commodity:** Surface / Coal (Bituminous)
- **Location:** Wise, VA
- **Operator:** Twin Ridge Development, Inc.
- **Controller:** Edsel H  Preece
- **Public source rows linked:** 75
- **Source coverage:** 12 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Edsel H  Preece (0042125) → Twin Ridge Development, Inc. (0053313) → Big Branch (4407103)**

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

## Controller and operator valid-time history

- **Edsel H  Preece et al → Twin Ridge Development, Inc.:** 2004-07-22 through current/open; derived from co-tenure at mine 4407103; source `msha-controller-operator-history`.

- History rows: 1
- Typed edges: 3
- 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 0 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 11 violation rows across the full record; 7 carry an S&S flag and $1,344 appears in current assessed amounts.
3. **HEALTH — 24 samples:** Occupational health samples 12 coal dust; 12 noise. 0 personal-sample rows have a published C/E ratio above 1; 1 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 0 employee hours and 0 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 8 inspection events and 139 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 48.11 — Hazard training.** (4 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-A/section-48.11
- **30 CFR 48.26 — Experienced miner training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-B/section-48.26
- **30 CFR 77.404 — Machinery and equipment; operation and maintenance.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-E/section-77.404
- **30 CFR 77.410 — Mobile equipment; automatic warning devices.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-E/section-77.410
- **30 CFR 77.1605 — Loading and haulage equipment; installations.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-Q/section-77.1605
- **30 CFR 77.1606 — Loading and haulage equipment; inspection and maintenance.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-Q/section-77.1606
- **30 CFR 77.403 — Mobile equipment; falling object protective structures (FOPS).** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-E/section-77.403

## Source coverage

- **Addresses of Record:** 1 rows; 2007-06-13 through 2007-06-13; source ID `msha-addresses`
- **Assessed Violations:** 11 rows; 2004-10-30 through 2005-05-23; source ID `msha-assessed-violations`
- **Coal Dust Samples:** 12 rows; 2004-11-02 through 2006-03-22; source ID `msha-coal-dust-samples`
- **Contractor Employment and Production — Quarterly:** 3 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 1 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 1 rows; 2004-07-22 through 2004-07-22; source ID `msha-controller-operator-history`
- **Inspections:** 8 rows; 2004-10-28 through 2007-06-13; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 11 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 3 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 12 rows; 2004-11-03 through 2006-03-22; source ID `msha-noise-samples`
- **Violations:** 11 rows; 2004-10-30 through 2005-05-23; 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-branch-4407103`
- JSON: `/api/v1/mines/big-branch-4407103`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4407103/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4407103/relationships`
- MCP resource: `mine://4407103/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`