# Black Rock Quarry & Plant

- **MSHA mine ID:** 0300011
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Lawrence, AR
- **Operator:** Meridian Aggregates Company LP
- **Controller:** Martin Marietta Materials Inc
- **Public source rows linked:** 2,257
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Martin Marietta Materials Inc (M00174) → Meridian Aggregates Company LP (L18213) → Black Rock Quarry & Plant (0300011)**

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

## Controller and operator valid-time history

- **Ben M Hogan Company Inc → St Francis Material Company:** 1950-01-01 through 1987-07-17; derived from co-tenure at mine 0300011; source `msha-controller-operator-history`.
- **William  Boorhem  et al → Boorhem-Fields Inc:** 1987-07-18 through 1993-03-14; derived from co-tenure at mine 0300011; source `msha-controller-operator-history`.
- **Meridian Aggregates Company LP → Meridian Aggregates Company:** 1993-03-15 through 2001-04-02; derived from co-tenure at mine 0300011; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Meridian Aggregates Company LP:** 2001-04-03 through current/open; derived from co-tenure at mine 0300011; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 12
- 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 19 historical accident/injury rows; 0 coded fatalities and 168 lost days across the published record.
2. **COMPLIANCE — 26 since 2021:** Violations and penalties 97 violation rows across the full record; 9 carry an S&S flag and $15,314 appears in current assessed amounts.
3. **HEALTH — 93 samples:** Occupational health samples 93 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 27K employee hours and 47 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 41 linked rows:** Contests, conferences and decisions 2 contested-violation rows, 30 civil-penalty docket/decision rows, and 9 conference records linked by issuance number.
6. **CONTRACTORS — 15 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 — 14 since 2021:** Inspections 60 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 56.4201 — Inspection.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4201
- **30 CFR 47.41 — Requirement for container labels.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.41
- **30 CFR 56.14100 — Safety defects; examination, correction and records.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 56.13015 — Inspection of compressed-air receivers and other unfired pressure vessels.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-L/section-56.13015
- **30 CFR 56.12018 — Identification of power switches.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12018
- **30 CFR 56.11002 — Handrails and toeboards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11002
- **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 56.12008 — 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 56.14112 — 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 56.20003 — Housekeeping.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 19 rows; 2000-01-10 through 2024-07-22; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2013-04-01 through 2013-04-01; source ID `msha-addresses`
- **Assessed Violations:** 95 rows; 2000-07-19 through 2026-08-17; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 30 rows; 2000-08-04 through 2026-02-19; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 9 rows; 2003-06-18 through 2025-05-13; source ID `msha-conferences`
- **Contested Violations:** 2 rows; 2016-02-10 through 2025-01-15; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,447 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 283 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1950-01-01 through 2001-04-03; source ID `msha-controller-operator-history`
- **Inspections:** 60 rows; 2000-07-19 through 2026-08-17; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 35 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:** 93 rows; 2000-07-19 through 2023-11-01; source ID `msha-personal-health-samples`
- **Violations:** 97 rows; 2000-07-19 through 2026-08-17; 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/black-rock-quarry-plant-0300011`
- JSON: `/api/v1/mines/black-rock-quarry-plant-0300011`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0300011/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0300011/relationships`
- MCP resource: `mine://0300011/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`