# MT. VERNON MINE & MILL

- **MSHA mine ID:** 1500051
- **Status:** Active
- **Type / commodity:** Underground / Crushed, Broken Limestone NEC
- **Location:** Rockcastle, KY
- **Operator:** Heidelberg Materials Midwest Agg, Inc.
- **Controller:** Heidelberg Materials AG
- **Public source rows linked:** 3,259
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Heidelberg Materials AG (M00004) → Heidelberg Materials Midwest Agg, Inc. (L16286) → MT. VERNON MINE & MILL (1500051)**

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

## Controller and operator valid-time history

- **Koppers Company Inc → Kentucky Stone Company:** 1950-01-01 through 1988-11-13; derived from co-tenure at mine 1500051; source `msha-controller-operator-history`.
- **Hanson PLC → Heidelberg Materials Midwest Agg, Inc.:** 1988-11-14 through 2007-08-22; derived from co-tenure at mine 1500051; source `msha-controller-operator-history`.
- **Heidelberg Materials AG → Heidelberg Materials Midwest Agg, Inc.:** 2007-08-23 through current/open; derived from co-tenure at mine 1500051; source `msha-controller-operator-history`.

- History rows: 3
- 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 — 2 since 2021:** Accidents and injuries 14 historical accident/injury rows; 0 coded fatalities and 10 lost days across the published record.
2. **COMPLIANCE — 65 since 2021:** Violations and penalties 232 violation rows across the full record; 46 carry an S&S flag and $48,509 appears in current assessed amounts.
3. **HEALTH — 186 samples:** Occupational health samples 174 personal; 12 area. 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 11K employee hours and 24 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 56 linked rows:** Contests, conferences and decisions 28 contested-violation rows, 28 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
6. **CONTRACTORS — 11 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 — 30 since 2021:** Inspections 144 inspection events and 4K 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 56.20008 — Toilet facilities.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20008
- **30 CFR 57.12004 — Electrical conductors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12004
- **30 CFR 57.12032 — Inspection and cover plates.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12032
- **30 CFR 57.20003 — Housekeeping.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-S/section-57.20003
- **30 CFR 57.14100 — Safety defects; examination, correction and records.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14100
- **30 CFR 57.14112 — Construction and maintenance of guards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14112
- **30 CFR 56.20003 — Housekeeping.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **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 56.11001 — 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:** 14 rows; 2001-10-24 through 2025-10-06; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2010-07-19 through 2010-07-19; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 12 rows; 2021-09-03 through 2026-08-27; source ID `msha-area-samples`
- **Assessed Violations:** 231 rows; 2000-07-25 through 2026-08-27; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 28 rows; 2011-08-17 through 2015-07-15; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 28 rows; 2010-01-26 through 2013-12-04; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,487 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 381 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 1950-01-01 through 1988-11-14; source ID `msha-controller-operator-history`
- **Inspections:** 144 rows; 2000-02-07 through 2026-10-05; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 422 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 101 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:** 174 rows; 2001-02-08 through 2026-08-27; source ID `msha-personal-health-samples`
- **Violations:** 232 rows; 2000-07-25 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/mt-vernon-mine-mill-1500051`
- JSON: `/api/v1/mines/mt-vernon-mine-mill-1500051`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1500051/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1500051/relationships`
- MCP resource: `mine://1500051/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`