# San Rafael Rock Quarry

- **MSHA mine ID:** 0400021
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Stone NEC
- **Location:** Marin, CA
- **Operator:** Dutra Materials
- **Controller:** CRH PLC
- **Public source rows linked:** 889
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**CRH PLC (M06183) → Dutra Materials (L11084) → San Rafael Rock Quarry (0400021)**

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

## Controller and operator valid-time history

- **Dillingham Construction Corp → Basalt Rock Div-Dillingham Heavy Const Inc:** 1950-01-01 through 1986-05-11; derived from co-tenure at mine 0400021; source `msha-controller-operator-history`.
- **Bill T  Dutra → Dutra Materials:** 1986-05-12 through 2024-11-14; derived from co-tenure at mine 0400021; source `msha-controller-operator-history`.
- **CRH PLC → Dutra Materials:** 2024-11-15 through current/open; derived from co-tenure at mine 0400021; source `msha-controller-operator-history`.
- **Dean  Soiland → Dutra Materials:** 2024-11-15 through 2024-04-04; derived from co-tenure at mine 0400021; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 11
- 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 2 since 2021:** Accidents and injuries 30 historical accident/injury rows; 0 coded fatalities and 468 lost days across the published record.
2. **COMPLIANCE — 30 since 2021:** Violations and penalties 274 violation rows across the full record; 54 carry an S&S flag and $94,136 appears in current assessed amounts.
3. **HEALTH — 29 samples:** Occupational health samples 29 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 24K employee hours and 50 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 82 linked rows:** Contests, conferences and decisions 26 contested-violation rows, 26 civil-penalty docket/decision rows, and 30 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 — 16 since 2021:** Inspections 79 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 56.4201 — Inspection.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4201
- **30 CFR 56.15005 — Safety belts and lines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15005
- **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.** (3 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 56.4200 — 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 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 56.12018 — 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 56.12032 — 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

## Source coverage

- **Accident, Injuries, and Illnesses:** 30 rows; 2000-06-28 through 2025-08-12; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1992-09-16 through 1992-09-16; source ID `msha-addresses`
- **Assessed Violations:** 269 rows; 2000-08-01 through 2025-10-22; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 26 rows; 2012-09-05 through 2026-03-12; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 30 rows; 2007-10-17 through 2012-12-31; source ID `msha-conferences`
- **Contested Violations:** 26 rows; 2011-02-23 through 2025-05-30; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 33 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 9 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1950-01-01 through 2024-11-15; source ID `msha-controller-operator-history`
- **Inspections:** 79 rows; 2000-08-01 through 2026-09-01; 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:** 29 rows; 2001-01-09 through 2026-09-02; source ID `msha-personal-health-samples`
- **Violations:** 274 rows; 2000-08-01 through 2025-10-22; 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/san-rafael-rock-quarry-0400021`
- JSON: `/api/v1/mines/san-rafael-rock-quarry-0400021`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0400021/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0400021/relationships`
- MCP resource: `mine://0400021/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`