# Columbus Limestone Quarry

- **MSHA mine ID:** 3302784
- **Status:** Abandoned
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Franklin, OH
- **Operator:** Columbus Limestone Inc
- **Controller:** CRH PLC
- **Public source rows linked:** 2,494
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**CRH PLC (M06183) → Columbus Limestone Inc (0050668) → Columbus Limestone Quarry (3302784)**

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

## Controller and operator valid-time history

- **American Aggregates Corp → American Aggregates Corp:** 1950-01-01 through 1987-02-28; derived from co-tenure at mine 3302784; source `msha-controller-operator-history`.
- **Consolidated Gold Fields Limited → American Aggregates Corp:** 1987-03-01 through 1989-08-09; derived from co-tenure at mine 3302784; source `msha-controller-operator-history`.
- **Hanson PLC → American Aggregates Corp:** 1989-08-10 through 1990-02-01; derived from co-tenure at mine 3302784; source `msha-controller-operator-history`.
- **CSR Ltd → American Aggregates Corp:** 1990-02-02 through 1997-05-27; derived from co-tenure at mine 3302784; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Aggregates:** 1997-05-28 through 2002-05-31; derived from co-tenure at mine 3302784; source `msha-controller-operator-history`.
- **CRH PLC → Columbus Limestone Inc:** 2002-06-01 through current/open; derived from co-tenure at mine 3302784; source `msha-controller-operator-history`.

- History rows: 6
- Typed edges: 18
- 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 — 0 since 2021:** Accidents and injuries 33 historical accident/injury rows; 0 coded fatalities and 304 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 60 violation rows across the full record; 19 carry an S&S flag and $7,378 appears in current assessed amounts.
3. **HEALTH — 39 samples:** Occupational health samples 39 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 25K employee hours and 38 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 1 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 civil-penalty docket/decision rows, and 1 conference records linked by issuance number.
6. **CONTRACTORS — 8 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 — 0 since 2021:** Inspections 40 inspection events and 824 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 56.12004 — Electrical conductors.** (2 retained recent rows) — 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 56.11001 — Safe access.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11001
- **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 56.12032 — 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 56.12018 — 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 56.12008 — 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 56.4201 — Inspection.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4201
- **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:** 33 rows; 2000-06-29 through 2011-01-11; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2011-12-07 through 2011-12-07; source ID `msha-addresses`
- **Assessed Violations:** 57 rows; 2001-04-11 through 2011-06-15; source ID `msha-assessed-violations`
- **Conferences:** 1 rows; 2007-05-15 through 2007-05-15; source ID `msha-conferences`
- **Contractor Employment and Production — Quarterly:** 1,736 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 343 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 6 rows; 1950-01-01 through 2002-06-01; source ID `msha-controller-operator-history`
- **Inspections:** 40 rows; 2000-01-13 through 2011-07-05; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 141 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 36 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:** 39 rows; 2003-03-11 through 2011-06-20; source ID `msha-personal-health-samples`
- **Violations:** 60 rows; 2001-04-11 through 2011-06-15; 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/columbus-limestone-quarry-3302784`
- JSON: `/api/v1/mines/columbus-limestone-quarry-3302784`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/3302784/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/3302784/relationships`
- MCP resource: `mine://3302784/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`