# Big Ledge Mine

- **MSHA mine ID:** 2602603
- **Status:** Abandoned
- **Type / commodity:** Surface / Barite Barium Ore
- **Location:** Elko, NV
- **Operator:** National Oilwell Varco, LP
- **Controller:** National Oilwell Varco Inc
- **Public source rows linked:** 1,385
- **Source coverage:** 14 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**National Oilwell Varco Inc (0087815) → National Oilwell Varco, LP (0103766) → Big Ledge Mine (2602603)**

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

## Controller and operator valid-time history

- **Spirit Minerals Management LLC et al → Spirit Minerals LP:** 2006-08-01 through 2009-07-12; derived from co-tenure at mine 2602603; source `msha-controller-operator-history`.
- **National Oilwell Varco Inc → National Oilwell Varco, LP:** 2009-07-13 through current/open; derived from co-tenure at mine 2602603; source `msha-controller-operator-history`.

- History rows: 2
- Typed edges: 6
- 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 26 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 24 violation rows across the full record; 4 carry an S&S flag and $35,195 appears in current assessed amounts.
3. **HEALTH — 0 samples:** Occupational health samples No published samples. 0 personal-sample rows have a published C/E ratio above 1; 0 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 — 9 linked rows:** Contests, conferences and decisions 3 contested-violation rows, 3 civil-penalty docket/decision rows, and 3 conference records linked by issuance number.
6. **CONTRACTORS — 4 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 18 inspection events and 192 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 56.4402 — Safety can use.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4402
- **30 CFR 56.4130 — Electric substations and liquid storage facilities.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4130
- **30 CFR 50.30 — Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-D/section-50.30
- **30 CFR 48.28 — Annual refresher training of miners; minimum courses of instruction; hours of instruction.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-B/section-48.28
- **30 CFR 56.12028 — Testing grounding systems.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12028
- **30 CFR 56.12030 — Correction of dangerous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12030
- **30 CFR 56.9300 — Berms or guardrails.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9300
- **30 CFR 56.4101 — Warning signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4101
- **30 CFR 56.9200 — Transporting persons.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9200
- **30 CFR 56.18010 — First aid.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18010
- **30 CFR 56.14107 — Moving machine parts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **30 CFR 56.3200 — Correction of hazardous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-B/section-56.3200

## Source coverage

- **Accident, Injuries, and Illnesses:** 5 rows; 2008-07-07 through 2012-07-23; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2017-01-31 through 2017-01-31; source ID `msha-addresses`
- **Assessed Violations:** 24 rows; 2008-04-02 through 2014-09-17; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 3 rows; 2010-09-30 through 2012-10-10; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 3 rows; 2008-04-22 through 2011-10-04; source ID `msha-conferences`
- **Contested Violations:** 3 rows; 2008-04-02 through 2011-07-01; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,004 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 229 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 2 rows; 2006-08-01 through 2009-07-13; source ID `msha-controller-operator-history`
- **Inspections:** 18 rows; 2007-07-17 through 2016-09-13; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 54 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 14 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Violations:** 24 rows; 2008-04-02 through 2014-09-17; 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-ledge-mine-2602603`
- JSON: `/api/v1/mines/big-ledge-mine-2602603`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/2602603/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/2602603/relationships`
- MCP resource: `mine://2602603/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`