# Churchville Quarry

- **MSHA mine ID:** 1800012
- **Status:** Active
- **Type / commodity:** Surface / Dimension Stone NEC
- **Location:** Harford, MD
- **Operator:** Bluegrass Materials Company, LLC
- **Controller:** Martin Marietta Materials Inc
- **Public source rows linked:** 2,591
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Martin Marietta Materials Inc (M00174) → Bluegrass Materials Company, LLC (0113025) → Churchville Quarry (1800012)**

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

## Controller and operator valid-time history

- **W Lester  Davis III → Davis Quarry Company Inc:** 1950-01-01 through 1979-03-23; derived from co-tenure at mine 1800012; source `msha-controller-operator-history`.
- **Flintkote Company → Flintkote Stone Products Company:** 1979-03-24 through 1980-04-06; derived from co-tenure at mine 1800012; source `msha-controller-operator-history`.
- **Cimenteries Cbr Cementbedrijven → Genstar Stone Products Company:** 1980-04-07 through 1986-11-03; derived from co-tenure at mine 1800012; source `msha-controller-operator-history`.
- **Redland Plc → Redland Genstar Inc:** 1986-11-04 through 1998-02-10; derived from co-tenure at mine 1800012; source `msha-controller-operator-history`.
- **Lafarge S A → Lafarge Mid-Atlantic, Inc.:** 1998-02-11 through 2009-05-04; derived from co-tenure at mine 1800012; source `msha-controller-operator-history`.
- **Lafarge S A → Lafarge Mid-Atlantic, LLC:** 2009-05-05 through 2014-02-12; derived from co-tenure at mine 1800012; source `msha-controller-operator-history`.
- **Panadero Aggregates Holdings, LLC → Bluegrass Materials Company, LLC:** 2014-02-13 through 2018-04-26; derived from co-tenure at mine 1800012; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Bluegrass Materials Company, LLC:** 2018-04-27 through current/open; derived from co-tenure at mine 1800012; source `msha-controller-operator-history`.

- History rows: 8
- Typed edges: 23
- 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 2 since 2021:** Accidents and injuries 14 historical accident/injury rows; 0 coded fatalities and 534 lost days across the published record.
2. **COMPLIANCE — 3 since 2021:** Violations and penalties 143 violation rows across the full record; 26 carry an S&S flag and $23,800 appears in current assessed amounts.
3. **HEALTH — 34 samples:** Occupational health samples 34 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 11K employee hours and 24 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 17 linked rows:** Contests, conferences and decisions 5 contested-violation rows, 9 civil-penalty docket/decision rows, and 3 conference records linked by issuance number.
6. **CONTRACTORS — 12 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 — 12 since 2021:** Inspections 63 inspection events and 2K 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 56.14107 — 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 46.9 — Records of training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.9
- **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 56.14112 — Construction and maintenance of guards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **30 CFR 56.14100 — Safety defects; examination, correction and records.** (5 retained recent rows) — 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 56.12032 — Inspection and cover plates.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **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; 2001-08-09 through 2026-04-17; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1979-07-13 through 1979-07-13; source ID `msha-addresses`
- **Assessed Violations:** 142 rows; 2000-03-01 through 2026-01-14; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 9 rows; 2001-12-13 through 2016-10-18; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 3 rows; 2007-06-15 through 2015-04-07; source ID `msha-conferences`
- **Contested Violations:** 5 rows; 2006-05-31 through 2016-04-06; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,725 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 326 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 8 rows; 1950-01-01 through 2014-02-13; source ID `msha-controller-operator-history`
- **Inspections:** 63 rows; 2000-02-29 through 2026-04-30; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 36 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:** 34 rows; 2002-07-17 through 2026-05-05; source ID `msha-personal-health-samples`
- **Violations:** 143 rows; 2000-03-01 through 2026-01-14; 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/churchville-quarry-1800012`
- JSON: `/api/v1/mines/churchville-quarry-1800012`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1800012/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1800012/relationships`
- MCP resource: `mine://1800012/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`