# Dredge Thaddus Carr

- **MSHA mine ID:** 4607091
- **Status:** Abandoned
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Beaver, PA
- **Operator:** Hanson Aggregates Pma Inc
- **Controller:** Heidelberg Materials AG
- **Public source rows linked:** 154
- **Source coverage:** 11 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Heidelberg Materials AG (M00004) → Hanson Aggregates Pma Inc (L18009) → Dredge Thaddus Carr (4607091)**

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

## Controller and operator valid-time history

- **Glenn I  Crain → Pittsburg Sand & Gravel Inc:** 1986-03-01 through 1991-03-07; derived from co-tenure at mine 4607091; source `msha-controller-operator-history`.
- **Standard Slag Company → Pittsburgh Sand & Gravel Inc:** 1991-03-08 through 1991-10-02; derived from co-tenure at mine 4607091; source `msha-controller-operator-history`.
- **Lafarge S A → Lafarge Construction Materials:** 1991-10-03 through 1996-05-15; derived from co-tenure at mine 4607091; source `msha-controller-operator-history`.
- **Pioneer International Ltd → Pioneer Mid-Atlantic Inc:** 1996-05-16 through 2000-08-03; derived from co-tenure at mine 4607091; source `msha-controller-operator-history`.
- **Hanson PLC → Hanson Aggregates Pma Inc:** 2000-08-04 through 2007-08-22; derived from co-tenure at mine 4607091; source `msha-controller-operator-history`.
- **Heidelberg Materials AG → Hanson Aggregates Pma Inc:** 2007-08-23 through current/open; derived from co-tenure at mine 4607091; source `msha-controller-operator-history`.

- History rows: 6
- Typed edges: 17
- 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 — 0 since 2021:** Accidents and injuries 6 historical accident/injury rows; 0 coded fatalities and 10 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 20 violation rows across the full record; 2 carry an S&S flag and $1,285 appears in current assessed amounts.
3. **HEALTH — 50 samples:** Occupational health samples 50 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 8K employee hours and 13 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 5 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 civil-penalty docket/decision rows, and 5 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 — 0 since 2021:** Inspections 13 inspection events and 210 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 56.12025 — Grounding circuit enclosures.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12025
- **30 CFR 56.20003 — Housekeeping.** (5 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **30 CFR 56.12030 — Correction of dangerous conditions.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12030
- **30 CFR 41.12 — Changes; notification by operator.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-G/part-41/subpart-B/section-41.12
- **30 CFR 56.13015 — Inspection of compressed-air receivers and other unfired pressure vessels.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-L/section-56.13015
- **30 CFR 56.11004 — Portable rigid ladders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11004

## Source coverage

- **Accident, Injuries, and Illnesses:** 6 rows; 2000-04-09 through 2003-10-24; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2004-11-05 through 2004-11-05; source ID `msha-addresses`
- **Assessed Violations:** 20 rows; 2000-08-09 through 2004-08-18; source ID `msha-assessed-violations`
- **Conferences:** 5 rows; 2004-03-12 through 2004-09-07; source ID `msha-conferences`
- **Controller and Operator History:** 6 rows; 1986-03-01 through 2000-08-04; source ID `msha-controller-operator-history`
- **Inspections:** 13 rows; 2000-08-09 through 2004-11-02; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 26 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 6 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:** 50 rows; 2002-01-31 through 2003-07-09; source ID `msha-personal-health-samples`
- **Violations:** 20 rows; 2000-08-09 through 2004-08-18; 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/dredge-thaddus-carr-4607091`
- JSON: `/api/v1/mines/dredge-thaddus-carr-4607091`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4607091/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4607091/relationships`
- MCP resource: `mine://4607091/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`