# PILARCITOS QUARRY

- **MSHA mine ID:** 0402261
- **Status:** Abandoned
- **Type / commodity:** Surface / Crushed, Broken Stone NEC
- **Location:** San Mateo, CA
- **Operator:** CalMat Co
- **Controller:** Vulcan Materials Company
- **Public source rows linked:** 1,406
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Vulcan Materials Company (0071891) → CalMat Co (L16645) → PILARCITOS QUARRY (0402261)**

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

## Controller and operator valid-time history

- **Lone Star Industries Inc → Lone Star Industries Inc:** 1950-01-01 through 1981-11-05; derived from co-tenure at mine 0402261; source `msha-controller-operator-history`.
- **Felix H  Siri → Piombo Corp:** 1981-11-06 through 1984-06-14; derived from co-tenure at mine 0402261; source `msha-controller-operator-history`.
- **Centennial Savings & Loan Association → Piombo Corp:** 1984-06-15 through 1986-06-20; derived from co-tenure at mine 0402261; source `msha-controller-operator-history`.
- **Felix H  Siri → Piombo Construction Company:** 1986-06-21 through 1992-08-31; derived from co-tenure at mine 0402261; source `msha-controller-operator-history`.
- **Dean  Rasmussen et al → Pilarcitos Quarry:** 1992-09-01 through 1993-01-17; derived from co-tenure at mine 0402261; source `msha-controller-operator-history`.
- **Eucon Corporation → West Coast Aggregates, Inc:** 1993-01-18 through 2008-10-05; derived from co-tenure at mine 0402261; source `msha-controller-operator-history`.
- **Richard O DeAtley et al → West Coast Aggregates, Inc:** 2008-10-06 through 2014-07-29; derived from co-tenure at mine 0402261; source `msha-controller-operator-history`.
- **Lafarge North America Inc. et al → West Coast Aggregates, Inc:** 2008-10-06 through 2014-07-29; derived from co-tenure at mine 0402261; source `msha-controller-operator-history`.
- **Neal  DeAtley et al → West Coast Aggregates, Inc:** 2008-10-06 through 2014-07-29; derived from co-tenure at mine 0402261; source `msha-controller-operator-history`.
- **Vulcan Materials Company → CalMat Co:** 2014-07-30 through current/open; derived from co-tenure at mine 0402261; source `msha-controller-operator-history`.
- **Legacy Vulcan Corp (Form:Vulcan Materials Co) → CalMat Co:** 2014-07-30 through 2007-11-15; derived from co-tenure at mine 0402261; source `msha-controller-operator-history`.

- History rows: 11
- Typed edges: 27
- 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 — 0 since 2021:** Accidents and injuries 9 historical accident/injury rows; 0 coded fatalities and 30 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 220 violation rows across the full record; 74 carry an S&S flag and $187,879 appears in current assessed amounts.
3. **HEALTH — 26 samples:** Occupational health samples 26 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 2K employee hours and 7 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 70 linked rows:** Contests, conferences and decisions 32 contested-violation rows, 32 civil-penalty docket/decision rows, and 6 conference records linked by issuance number.
6. **CONTRACTORS — 5 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 — 1 since 2021:** Inspections 61 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 56.14132 — 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 56.11002 — Handrails and toeboards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11002
- **30 CFR 56.11027 — Scaffolds and working platforms.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11027
- **30 CFR 56.14107 — Moving machine parts.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **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 56.3130 — Wall, bank, and slope stability.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-B/section-56.3130
- **30 CFR 56.11001 — Safe access.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11001
- **30 CFR 46.9 — Records of training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.9
- **30 CFR 56.17001 — Illumination of surface working areas.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-P/section-56.17001

## Source coverage

- **Accident, Injuries, and Illnesses:** 9 rows; 2001-04-11 through 2017-04-18; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2022-03-20 through 2022-03-20; source ID `msha-addresses`
- **Assessed Violations:** 217 rows; 2000-08-30 through 2018-09-20; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 32 rows; 2009-03-13 through 2013-04-02; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 6 rows; 2002-11-21 through 2016-06-08; source ID `msha-conferences`
- **Contested Violations:** 32 rows; 2007-09-19 through 2011-11-08; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 476 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 110 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 11 rows; 1950-01-01 through 2014-07-30; source ID `msha-controller-operator-history`
- **Inspections:** 61 rows; 2000-08-30 through 2021-02-16; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 162 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 42 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:** 26 rows; 2002-05-31 through 2020-01-22; source ID `msha-personal-health-samples`
- **Violations:** 220 rows; 2000-08-30 through 2018-09-20; 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/pilarcitos-quarry-0402261`
- JSON: `/api/v1/mines/pilarcitos-quarry-0402261`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0402261/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0402261/relationships`
- MCP resource: `mine://0402261/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`