# Charlestown Quarry

- **MSHA mine ID:** 1201720
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Clark, IN
- **Operator:** Mulzer Crushed Stone Inc
- **Controller:** CRH PLC
- **Public source rows linked:** 1,622
- **Source coverage:** 16 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**CRH PLC (M06183) → Mulzer Crushed Stone Inc (L00309) → Charlestown Quarry (1201720)**

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

## Controller and operator valid-time history

- **Martin Marietta Materials Inc → Martin Marietta Aggregates:** 1979-01-01 through 1987-12-31; derived from co-tenure at mine 1201720; source `msha-controller-operator-history`.
- **Bart  Mulzer et al → Mulzer Crushed Stone Inc:** 1988-01-01 through 2017-02-09; derived from co-tenure at mine 1201720; source `msha-controller-operator-history`.
- **CRH PLC → Mulzer Crushed Stone Inc:** 2017-02-10 through current/open; derived from co-tenure at mine 1201720; 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 2 since 2021:** Accidents and injuries 41 historical accident/injury rows; 0 coded fatalities and 76 lost days across the published record.
2. **COMPLIANCE — 20 since 2021:** Violations and penalties 121 violation rows across the full record; 23 carry an S&S flag and $19,357 appears in current assessed amounts.
3. **HEALTH — 39 samples:** Occupational health samples 37 personal; 2 area. 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 21K employee hours and 34 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 9 linked rows:** Contests, conferences and decisions 3 contested-violation rows, 4 civil-penalty docket/decision rows, and 2 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 79 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 56.17001 — Illumination of surface working areas.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-P/section-56.17001
- **30 CFR 56.14132 — Horns and backup alarms.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **30 CFR 56.4130 — Electric substations and liquid storage facilities.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4130
- **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 56.12004 — 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 56.4603 — Closure of valves.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4603
- **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
- **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 56.12032 — 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 56.14101 — Brakes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14101

## Source coverage

- **Accident, Injuries, and Illnesses:** 41 rows; 2000-08-01 through 2026-05-27; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1991-02-07 through 1991-02-07; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 2 rows; 2023-06-28 through 2023-06-28; source ID `msha-area-samples`
- **Assessed Violations:** 121 rows; 2000-10-03 through 2025-10-30; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2002-03-20 through 2025-07-09; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 2 rows; 2007-07-19 through 2023-08-14; source ID `msha-conferences`
- **Contested Violations:** 3 rows; 2011-03-16 through 2024-12-12; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 872 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 218 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 1979-01-01 through 1988-01-01; source ID `msha-controller-operator-history`
- **Inspections:** 79 rows; 2000-10-03 through 2026-06-15; 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:** 37 rows; 2000-10-04 through 2026-06-23; source ID `msha-personal-health-samples`
- **Violations:** 121 rows; 2000-10-03 through 2025-10-30; 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/charlestown-quarry-1201720`
- JSON: `/api/v1/mines/charlestown-quarry-1201720`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1201720/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1201720/relationships`
- MCP resource: `mine://1201720/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`