# Dimmit Mine

- **MSHA mine ID:** 4105387
- **Status:** Active
- **Type / commodity:** Surface / Sand, Industrial NEC
- **Location:** Dimmit, TX
- **Operator:** Iron Oak Eagle Ford LLC
- **Controller:** Iron Oak Energy Solutions LLC
- **Public source rows linked:** 2,588
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Iron Oak Energy Solutions LLC (0189021) → Iron Oak Eagle Ford LLC (0159333) → Dimmit Mine (4105387)**

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

## Controller and operator valid-time history

- **Black Mountain Sand Holdings LLC et al → Iron Oak Eagle Ford LLC:** 2018-09-13 through 2022-06-30; derived from co-tenure at mine 4105387; source `msha-controller-operator-history`.
- **Owl Rock et al → Iron Oak Eagle Ford LLC:** 2018-09-13 through 2022-06-30; derived from co-tenure at mine 4105387; source `msha-controller-operator-history`.
- **Black Mountain Sand Holdings LLC → Iron Oak Eagle Ford LLC:** 2022-07-01 through 2024-10-31; derived from co-tenure at mine 4105387; source `msha-controller-operator-history`.
- **Iron Oak Energy Solutions LLC → Iron Oak Eagle Ford LLC:** 2024-11-01 through current/open; derived from co-tenure at mine 4105387; 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 — 7 since 2021:** Accidents and injuries 14 historical accident/injury rows; 0 coded fatalities and 336 lost days across the published record.
2. **COMPLIANCE — 169 since 2021:** Violations and penalties 200 violation rows across the full record; 31 carry an S&S flag and $186,646 appears in current assessed amounts.
3. **HEALTH — 21 samples:** Occupational health samples 21 personal. 5 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 41K employee hours and 67 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 13 linked rows:** Contests, conferences and decisions 4 contested-violation rows, 4 civil-penalty docket/decision rows, and 5 conference records linked by issuance number.
6. **CONTRACTORS — 10 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 — 34 since 2021:** Inspections 45 inspection events and 809 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 56.12068 — Locking transformer enclosures.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12068
- **30 CFR 56.11012 — Protection for openings around travelways.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11012
- **30 CFR 56.12020 — Protection of persons at switchgear.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12020
- **30 CFR 56.12025 — Grounding circuit enclosures.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12025
- **30 CFR 56.16006 — Protection of gas cylinder valves.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16006
- **30 CFR 56.14107 — Moving machine parts.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **30 CFR 56.12004 — Electrical conductors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **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 56.20011 — Barricades and warning signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20011
- **30 CFR 56.15020 — Life jackets and belts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15020

## Source coverage

- **Accident, Injuries, and Illnesses:** 14 rows; 2019-03-11 through 2026-05-09; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2022-05-16 through 2022-05-16; source ID `msha-addresses`
- **Assessed Violations:** 193 rows; 2018-11-14 through 2026-04-22; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2019-08-07 through 2025-12-01; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 5 rows; 2020-06-19 through 2024-07-30; source ID `msha-conferences`
- **Contested Violations:** 4 rows; 2019-04-09 through 2025-02-18; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,625 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 391 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 2018-09-13 through 2018-09-13; source ID `msha-controller-operator-history`
- **Inspections:** 45 rows; 2018-11-13 through 2026-05-06; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 62 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 18 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Metal and Nonmetal Personal Health Samples:** 21 rows; 2019-04-10 through 2025-12-03; source ID `msha-personal-health-samples`
- **Violations:** 200 rows; 2018-11-14 through 2026-04-22; 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/dimmit-mine-4105387`
- JSON: `/api/v1/mines/dimmit-mine-4105387`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4105387/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4105387/relationships`
- MCP resource: `mine://4105387/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`