# Moorpark Quarry

- **MSHA mine ID:** 0404140
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Ventura, CA
- **Operator:** CEMEX Construction Materials Pacific, LLC
- **Controller:** Cemex S A
- **Public source rows linked:** 1,331
- **Source coverage:** 14 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Cemex S A (M09149) → CEMEX Construction Materials Pacific, LLC (0103149) → Moorpark Quarry (0404140)**

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

## Controller and operator valid-time history

- **James P  Sandoval → Blue Star Ready Mix Inc:** 1950-01-01 through 1993-10-01; derived from co-tenure at mine 0404140; source `msha-controller-operator-history`.
- **Southdown Inc → Southdown California Aggregates:** 1993-10-02 through 2001-07-09; derived from co-tenure at mine 0404140; source `msha-controller-operator-history`.
- **Cemex S A → CEMEX Construction Materials LP:** 2001-07-10 through 2015-02-23; derived from co-tenure at mine 0404140; source `msha-controller-operator-history`.
- **Cemex S A → CEMEX Construction Materials Pacific, LLC:** 2015-02-24 through current/open; derived from co-tenure at mine 0404140; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 12
- 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 14 historical accident/injury rows; 0 coded fatalities and 311 lost days across the published record.
2. **COMPLIANCE — 23 since 2021:** Violations and penalties 163 violation rows across the full record; 42 carry an S&S flag and $26,628 appears in current assessed amounts.
3. **HEALTH — 12 samples:** Occupational health samples 12 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 11 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 16 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 2 civil-penalty docket/decision rows, and 14 conference records linked by issuance number.
6. **CONTRACTORS — 6 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 — 22 since 2021:** Inspections 75 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 56.11001 — 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 56.20010 — Retaining dams.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20010
- **30 CFR 56.18002 — Examination of working places.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18002
- **30 CFR 50.30 — Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-D/section-50.30
- **30 CFR 56.12002 — Controls and switches.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12002
- **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 56.16001 — Stacking and storage of materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16001
- **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 56.12004 — 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 56.12032 — 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:** 14 rows; 2000-09-06 through 2018-08-13; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2011-10-01 through 2011-10-01; source ID `msha-addresses`
- **Assessed Violations:** 162 rows; 2000-02-08 through 2026-08-05; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 2 rows; 2004-07-27 through 2004-07-27; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 14 rows; 2000-03-02 through 2011-09-07; source ID `msha-conferences`
- **Contractor Employment and Production — Quarterly:** 527 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 90 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1950-01-01 through 2015-02-24; source ID `msha-controller-operator-history`
- **Inspections:** 75 rows; 2000-02-08 through 2026-08-17; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 212 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:** 12 rows; 2006-01-11 through 2025-04-02; source ID `msha-personal-health-samples`
- **Violations:** 163 rows; 2000-02-08 through 2026-08-05; 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/moorpark-quarry-0404140`
- JSON: `/api/v1/mines/moorpark-quarry-0404140`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0404140/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0404140/relationships`
- MCP resource: `mine://0404140/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`