# Bonny Brook Quarry

- **MSHA mine ID:** 3600210
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Cumberland, PA
- **Operator:** York Building Products
- **Controller:** David J  Stewart
- **Public source rows linked:** 1,790
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**David J  Stewart (0113025) → York Building Products (L00964) → Bonny Brook Quarry (3600210)**

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

## Controller and operator valid-time history

- **Mumma Robert M (Estate) & Max C Hempt → Union Quarries Inc:** 1950-01-01 through 2022-09-08; derived from co-tenure at mine 3600210; source `msha-controller-operator-history`.
- **David J  Stewart → York Building Products:** 2022-09-09 through current/open; derived from co-tenure at mine 3600210; source `msha-controller-operator-history`.
- **Robert H Stewart III et al → York Building Products:** 2022-09-09 through 2022-09-08; derived from co-tenure at mine 3600210; source `msha-controller-operator-history`.

- History rows: 3
- Typed edges: 8
- Interval anomalies: 1
- 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 — 3 since 2021:** Accidents and injuries 33 historical accident/injury rows; 0 coded fatalities and 554 lost days across the published record.
2. **COMPLIANCE — 16 since 2021:** Violations and penalties 141 violation rows across the full record; 25 carry an S&S flag and $19,896 appears in current assessed amounts.
3. **HEALTH — 27 samples:** Occupational health samples 27 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 7K employee hours and 14 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 2 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 civil-penalty docket/decision rows, and 2 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 — 12 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 56.14207 — Parking procedures for unattended equipment.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14207
- **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 56.14105 — Procedures during repairs or maintenance.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14105
- **30 CFR 56.12028 — Testing grounding systems.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12028
- **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 56.9300 — 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 56.14112 — Construction and maintenance of guards.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **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 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 56.12006 — Distribution boxes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12006

## Source coverage

- **Accident, Injuries, and Illnesses:** 33 rows; 2000-01-11 through 2025-08-14; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1981-06-08 through 1981-06-08; source ID `msha-addresses`
- **Assessed Violations:** 141 rows; 2000-05-22 through 2026-04-06; source ID `msha-assessed-violations`
- **Conferences:** 2 rows; 2004-07-14 through 2004-07-14; source ID `msha-conferences`
- **Contractor Employment and Production — Quarterly:** 806 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 175 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 1950-01-01 through 2022-09-09; source ID `msha-controller-operator-history`
- **Inspections:** 71 rows; 2000-05-22 through 2026-04-06; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 310 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 79 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:** 27 rows; 2003-09-04 through 2024-12-17; source ID `msha-personal-health-samples`
- **Violations:** 141 rows; 2000-05-22 through 2026-04-06; 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/bonny-brook-quarry-3600210`
- JSON: `/api/v1/mines/bonny-brook-quarry-3600210`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/3600210/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/3600210/relationships`
- MCP resource: `mine://3600210/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`