# American Black Quarry

- **MSHA mine ID:** 3605508
- **Status:** Active
- **Type / commodity:** Surface / Dimension Granite
- **Location:** Chester, PA
- **Operator:** Pennsylvania Granite Corp.
- **Controller:** Polycor Inc
- **Public source rows linked:** 854
- **Source coverage:** 14 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Polycor Inc (M12431) → Pennsylvania Granite Corp. (L15573) → American Black Quarry (3605508)**

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

## Controller and operator valid-time history

- **Stanley  Wilbur → Pennsylvania Granite Corp:** 1950-01-01 through 1988-09-30; derived from co-tenure at mine 3605508; source `msha-controller-operator-history`.
- **Keystone Memorial Co & Childs & Childs Granite Com → Pennsylvania Granite Corp:** 1988-10-01 through 1997-10-31; derived from co-tenure at mine 3605508; source `msha-controller-operator-history`.
- **Kurt M  Swenson → Pennsylvania Granite Corp.:** 1997-11-01 through 2016-09-20; derived from co-tenure at mine 3605508; source `msha-controller-operator-history`.
- **Polycor Inc → Pennsylvania Granite Corp.:** 2016-09-21 through 2023-07-04; derived from co-tenure at mine 3605508; source `msha-controller-operator-history`.
- **TorQuest Partners Inc → Pennsylvania Granite Corp.:** 2023-07-05 through 2023-08-31; derived from co-tenure at mine 3605508; source `msha-controller-operator-history`.
- **Polycor Inc → Pennsylvania Granite Corp.:** 2023-09-01 through current/open; derived from co-tenure at mine 3605508; source `msha-controller-operator-history`.

- History rows: 6
- Typed edges: 15
- 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 — 8 since 2021:** Accidents and injuries 33 historical accident/injury rows; 0 coded fatalities and 276 lost days across the published record.
2. **COMPLIANCE — 23 since 2021:** Violations and penalties 208 violation rows across the full record; 53 carry an S&S flag and $157,955 appears in current assessed amounts.
3. **HEALTH — 42 samples:** Occupational health samples 42 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 10K employee hours and 19 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 108 linked rows:** Contests, conferences and decisions 57 contested-violation rows, 51 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
6. **CONTRACTORS — 2 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 — 14 since 2021:** Inspections 94 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 46.6 — Newly hired experienced miner training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.6
- **30 CFR 56.4104 — Combustible waste.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4104
- **30 CFR 56.9300 — Berms or guardrails.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9300
- **30 CFR 56.16005 — Securing gas cylinders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16005
- **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 50.30 — Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-D/section-50.30
- **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 56.14100 — 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 56.14112 — 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

## Source coverage

- **Accident, Injuries, and Illnesses:** 33 rows; 2000-09-22 through 2025-12-23; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1976-03-10 through 1976-03-10; source ID `msha-addresses`
- **Assessed Violations:** 204 rows; 2001-02-07 through 2026-07-15; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 51 rows; 2009-07-15 through 2013-11-06; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 57 rows; 2008-02-05 through 2012-12-18; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 73 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 6 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 6 rows; 1950-01-01 through 1997-11-01; source ID `msha-controller-operator-history`
- **Inspections:** 94 rows; 2000-06-27 through 2026-07-16; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 24 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 54 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:** 42 rows; 2003-07-03 through 2024-07-18; source ID `msha-personal-health-samples`
- **Violations:** 208 rows; 2001-02-07 through 2026-07-15; 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/american-black-quarry-3605508`
- JSON: `/api/v1/mines/american-black-quarry-3605508`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/3605508/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/3605508/relationships`
- MCP resource: `mine://3605508/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`