# Marble Cliff Quarry

- **MSHA mine ID:** 3300097
- **Status:** Active
- **Type / commodity:** Underground / Crushed, Broken Limestone NEC
- **Location:** Franklin, OH
- **Operator:** Shelly Materials Inc
- **Controller:** CRH PLC
- **Public source rows linked:** 3,294
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**CRH PLC (M06183) → Shelly Materials Inc (L17597) → Marble Cliff Quarry (3300097)**

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

## Controller and operator valid-time history

- **Medusa Corp → Medusa Aggregates Company:** 1950-01-01 through 1978-12-31; derived from co-tenure at mine 3300097; source `msha-controller-operator-history`.
- **Crane Company → Medusa Aggregates Company:** 1979-01-01 through 1983-03-06; derived from co-tenure at mine 3300097; source `msha-controller-operator-history`.
- **American Aggregates Corp → American Aggregates Corp:** 1983-03-07 through 1987-02-28; derived from co-tenure at mine 3300097; 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 3300097; source `msha-controller-operator-history`.
- **Hanson PLC → American Aggregates Corp:** 1989-08-10 through 1990-02-01; derived from co-tenure at mine 3300097; source `msha-controller-operator-history`.
- **CSR Ltd → American Aggregates Corp:** 1990-02-02 through 1997-05-27; derived from co-tenure at mine 3300097; 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 3300097; source `msha-controller-operator-history`.
- **CRH PLC → Marble Cliff Limestone, Inc.:** 2002-06-01 through 2003-07-15; derived from co-tenure at mine 3300097; source `msha-controller-operator-history`.
- **CRH PLC → Shelly Materials Inc:** 2003-07-16 through current/open; derived from co-tenure at mine 3300097; source `msha-controller-operator-history`.

- History rows: 9
- Typed edges: 27
- 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 — 5 since 2021:** Accidents and injuries 30 historical accident/injury rows; 0 coded fatalities and 442 lost days across the published record.
2. **COMPLIANCE — 62 since 2021:** Violations and penalties 118 violation rows across the full record; 25 carry an S&S flag and $44,455 appears in current assessed amounts.
3. **HEALTH — 64 samples:** Occupational health samples 60 personal; 4 area. 3 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 33 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 13 linked rows:** Contests, conferences and decisions 7 contested-violation rows, 6 civil-penalty docket/decision rows, and 0 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 — 24 since 2021:** Inspections 69 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 62.120 — Action level.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-M/part-62/section-62.120
- **30 CFR 57.9300 — Berms or guardrails.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-H/section-57.9300
- **30 CFR 57.14112 — Construction and maintenance of guards.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14112
- **30 CFR 57.14100 — Safety defects; examination, correction and records.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14100
- **30 CFR 57.3200 — Correction of hazardous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-B/section-57.3200
- **30 CFR 57.14130 — Roll-over protective structures (ROPS) and seat belts for surface equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14130
- **30 CFR 57.4200 — General requirements.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-C/section-57.4200
- **30 CFR 57.11002 — Handrails and toeboards.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-J/section-57.11002
- **30 CFR 57.20003 — Housekeeping.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-S/section-57.20003

## Source coverage

- **Accident, Injuries, and Illnesses:** 30 rows; 2000-01-20 through 2025-07-10; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2019-07-09 through 2019-07-09; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 4 rows; 2025-01-23 through 2025-10-06; source ID `msha-area-samples`
- **Assessed Violations:** 117 rows; 2001-05-02 through 2026-07-29; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 6 rows; 2012-08-28 through 2026-03-24; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 7 rows; 2010-06-03 through 2025-10-08; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 2,101 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 425 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 9 rows; 1950-01-01 through 2003-07-16; source ID `msha-controller-operator-history`
- **Inspections:** 69 rows; 2000-02-28 through 2026-09-14; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 270 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 76 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:** 60 rows; 2001-05-02 through 2026-09-15; source ID `msha-personal-health-samples`
- **Violations:** 118 rows; 2001-05-02 through 2026-09-15; 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/marble-cliff-quarry-3300097`
- JSON: `/api/v1/mines/marble-cliff-quarry-3300097`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/3300097/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/3300097/relationships`
- MCP resource: `mine://3300097/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`