# MILL CREEK DOLOMITE

- **MSHA mine ID:** 3400008
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Johnston, OK
- **Operator:** Mill Creek Dolomite LLC
- **Controller:** United States Lime & Minerals Inc
- **Public source rows linked:** 1,725
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**United States Lime & Minerals Inc (M08976) → Mill Creek Dolomite LLC (0118932) → MILL CREEK DOLOMITE (3400008)**

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

## Controller and operator valid-time history

- **Don  Wallace → Delta Mining Corp:** 1950-01-01 through 1990-03-31; derived from co-tenure at mine 3400008; source `msha-controller-operator-history`.
- **S C R-Sibelco Nv et al → Unimin Corp:** 1990-04-01 through 2011-07-10; derived from co-tenure at mine 3400008; source `msha-controller-operator-history`.
- **MIN-AD → Mill Creek Dolomite LLC:** 2011-07-11 through 2022-02-09; derived from co-tenure at mine 3400008; source `msha-controller-operator-history`.
- **Covia Holdings LLC → Unimin Corp:** 2021-01-01 through 2011-07-10; derived from co-tenure at mine 3400008; source `msha-controller-operator-history`.
- **United States Lime & Minerals Inc → Mill Creek Dolomite LLC:** 2022-02-10 through current/open; derived from co-tenure at mine 3400008; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 13
- Interval anomalies: 1
- 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 — 3 since 2021:** Accidents and injuries 13 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 107 since 2021:** Violations and penalties 285 violation rows across the full record; 101 carry an S&S flag and $165,502 appears in current assessed amounts.
3. **HEALTH — 38 samples:** Occupational health samples 38 personal. 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 9K employee hours and 18 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 13 linked rows:** Contests, conferences and decisions 6 contested-violation rows, 6 civil-penalty docket/decision rows, and 1 conference records linked by issuance number.
6. **CONTRACTORS — 6 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 — 22 since 2021:** Inspections 88 inspection events and 1K 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 56.18002 — Examination of working places.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18002
- **30 CFR 56.14130 — Roll-over protective structures (ROPS) and seat belts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14130
- **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 56.14100 — Safety defects; examination, correction and records.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 56.14132 — Horns and backup alarms.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **30 CFR 56.16005 — Securing gas cylinders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16005
- **30 CFR 56.14112 — Construction and maintenance of guards.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **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 56.12008 — Insulation and fittings for power wires and cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12008
- **30 CFR 56.11001 — Safe access.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11001

## Source coverage

- **Accident, Injuries, and Illnesses:** 13 rows; 2007-06-27 through 2025-08-01; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1972-03-18 through 1972-03-18; source ID `msha-addresses`
- **Assessed Violations:** 285 rows; 2000-02-01 through 2026-04-02; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 6 rows; 2016-05-11 through 2023-01-31; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 1 rows; 2001-12-07 through 2001-12-07; source ID `msha-conferences`
- **Contested Violations:** 6 rows; 2015-10-14 through 2022-06-28; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 481 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 116 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 1950-01-01 through 2011-07-11; source ID `msha-controller-operator-history`
- **Inspections:** 88 rows; 2000-02-01 through 2026-04-14; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 318 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 81 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:** 38 rows; 2003-04-02 through 2025-05-14; source ID `msha-personal-health-samples`
- **Violations:** 285 rows; 2000-02-01 through 2026-04-02; 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/mill-creek-dolomite-3400008`
- JSON: `/api/v1/mines/mill-creek-dolomite-3400008`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/3400008/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/3400008/relationships`
- MCP resource: `mine://3400008/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`