# Marblehead Quarry

- **MSHA mine ID:** 3304530
- **Status:** Abandoned
- **Type / commodity:** Facility / Crushed, Broken Limestone NEC
- **Location:** Ottawa, OH
- **Operator:** Geo Gradel Co
- **Controller:** John F. Gradel Sr Trust
- **Public source rows linked:** 169
- **Source coverage:** 9 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**John F. Gradel Sr Trust (0179703) → Geo Gradel Co (0052533) → Marblehead Quarry (3304530)**

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

## Controller and operator valid-time history

- **John F  Gradel Sr → Geo Gradel Co:** 2004-05-03 through 2023-04-19; derived from co-tenure at mine 3304530; source `msha-controller-operator-history`.
- **John F. Gradel Sr Trust → Geo Gradel Co:** 2023-04-20 through current/open; derived from co-tenure at mine 3304530; source `msha-controller-operator-history`.

- History rows: 2
- Typed edges: 5
- 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 — 1 since 2021:** Accidents and injuries 3 historical accident/injury rows; 0 coded fatalities and 1 lost days across the published record.
2. **COMPLIANCE — 9 since 2021:** Violations and penalties 51 violation rows across the full record; 6 carry an S&S flag and $5,880 appears in current assessed amounts.
3. **HEALTH — 7 samples:** Occupational health samples 7 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 — No published quarter:** Quarterly production and employment The source remains registered, but no mine-keyed quarterly production row was published.
5. **LEGAL — 0 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
6. **CONTRACTORS — 0 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 — 7 since 2021:** Inspections 31 inspection events and 440 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 56.14132 — Horns and backup alarms.** (3 retained recent rows) — 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 56.4101 — Warning signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4101
- **30 CFR 41.11 — Notification by operator.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-G/part-41/subpart-B/section-41.11
- **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
- **30 CFR 56.4200 — General requirements.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4200
- **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 56.4203 — Extinguisher recharging or replacement.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4203
- **30 CFR 56.14206 — Securing movable parts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14206
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 3 rows; 2011-09-12 through 2025-01-28; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2025-08-01 through 2025-08-01; source ID `msha-addresses`
- **Assessed Violations:** 51 rows; 2004-08-19 through 2025-01-15; source ID `msha-assessed-violations`
- **Controller and Operator History:** 2 rows; 2004-05-03 through 2004-05-03; source ID `msha-controller-operator-history`
- **Inspections:** 31 rows; 2004-08-19 through 2025-01-21; source ID `msha-inspections`
- **Mine Employment and Production — Yearly:** 22 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:** 7 rows; 2013-09-24 through 2019-10-02; source ID `msha-personal-health-samples`
- **Violations:** 51 rows; 2004-08-19 through 2025-01-15; 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/marblehead-quarry-3304530`
- JSON: `/api/v1/mines/marblehead-quarry-3304530`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/3304530/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/3304530/relationships`
- MCP resource: `mine://3304530/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`