# Curtin Gap Quarry

- **MSHA mine ID:** 3600516
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Centre, PA
- **Operator:** Heidelberg Materials Northeast LLC
- **Controller:** Heidelberg Materials AG
- **Public source rows linked:** 1,818
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Heidelberg Materials AG (M00004) → Heidelberg Materials Northeast LLC (L16322) → Curtin Gap Quarry (3600516)**

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

## Controller and operator valid-time history

- **Herbert R Imbt Inc → Herbert R Imbt Inc:** 1950-01-01 through 1986-11-12; derived from co-tenure at mine 3600516; source `msha-controller-operator-history`.
- **Koppers Company Inc → Herbert R Imbt Inc:** 1986-11-13 through 1988-11-13; derived from co-tenure at mine 3600516; source `msha-controller-operator-history`.
- **Hanson PLC → Heidelberg Materials Northeast LLC:** 1988-11-14 through 2007-08-22; derived from co-tenure at mine 3600516; source `msha-controller-operator-history`.
- **Heidelberg Materials AG → Heidelberg Materials Northeast LLC:** 2007-08-23 through current/open; derived from co-tenure at mine 3600516; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 11
- 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 — 4 since 2021:** Accidents and injuries 10 historical accident/injury rows; 0 coded fatalities and 167 lost days across the published record.
2. **COMPLIANCE — 44 since 2021:** Violations and penalties 142 violation rows across the full record; 11 carry an S&S flag and $42,289 appears in current assessed amounts.
3. **HEALTH — 70 samples:** Occupational health samples 70 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 9K employee hours and 17 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 56 linked rows:** Contests, conferences and decisions 26 contested-violation rows, 26 civil-penalty docket/decision rows, and 4 conference records linked by issuance number.
6. **CONTRACTORS — 7 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 — 17 since 2021:** Inspections 71 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 56.14107 — Moving machine parts.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **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 56.20003 — 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 56.9300 — 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.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 56.12006 — Distribution boxes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12006
- **30 CFR 56.14115 — Stationary grinding machines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14115
- **30 CFR 56.4402 — Safety can use.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4402

## Source coverage

- **Accident, Injuries, and Illnesses:** 10 rows; 2000-05-09 through 2025-04-09; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2011-12-07 through 2011-12-07; source ID `msha-addresses`
- **Assessed Violations:** 135 rows; 2000-04-19 through 2026-05-20; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 26 rows; 2011-08-23 through 2016-01-20; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 4 rows; 2007-05-21 through 2019-08-08; source ID `msha-conferences`
- **Contested Violations:** 26 rows; 2010-09-22 through 2015-06-24; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 771 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 158 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1950-01-01 through 1988-11-14; source ID `msha-controller-operator-history`
- **Inspections:** 71 rows; 2000-04-18 through 2026-10-05; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 318 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:** 70 rows; 2002-01-16 through 2026-05-27; source ID `msha-personal-health-samples`
- **Violations:** 142 rows; 2000-04-19 through 2026-10-06; 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/curtin-gap-quarry-3600516`
- JSON: `/api/v1/mines/curtin-gap-quarry-3600516`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/3600516/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/3600516/relationships`
- MCP resource: `mine://3600516/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`