# Clayton Plant

- **MSHA mine ID:** 0400173
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Stone NEC
- **Location:** Contra Costa, CA
- **Operator:** CEMEX Construction Materials Pacific, LLC
- **Controller:** Cemex S A
- **Public source rows linked:** 941
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Cemex S A (M09149) → CEMEX Construction Materials Pacific, LLC (0103149) → Clayton Plant (0400173)**

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 1987-12-31; derived from co-tenure at mine 0400173; source `msha-controller-operator-history`.
- **RMC Group PLC → CEMEX:** 1988-01-01 through 2005-02-28; derived from co-tenure at mine 0400173; source `msha-controller-operator-history`.
- **Cemex S A → CEMEX:** 2005-03-01 through 2006-11-30; derived from co-tenure at mine 0400173; source `msha-controller-operator-history`.
- **Cemex S A → Cemex Construction Materials LP:** 2006-12-01 through 2009-03-28; derived from co-tenure at mine 0400173; source `msha-controller-operator-history`.
- **Cemex S A → CEMEX Construction Materials Pacific, LLC:** 2009-03-29 through current/open; derived from co-tenure at mine 0400173; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 14
- 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 4 since 2021:** Accidents and injuries 21 historical accident/injury rows; 0 coded fatalities and 470 lost days across the published record.
2. **COMPLIANCE — 21 since 2021:** Violations and penalties 174 violation rows across the full record; 37 carry an S&S flag and $72,749 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 12K employee hours and 19 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 58 linked rows:** Contests, conferences and decisions 28 contested-violation rows, 28 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 — 16 since 2021:** Inspections 76 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 56.14107 — 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 56.12032 — Inspection and cover plates.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **30 CFR 46.7 — New task training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.7
- **30 CFR 56.20003 — Housekeeping.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **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 56.14100 — 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 62.130 — Permissible exposure level.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-M/part-62/section-62.130
- **30 CFR 50.30-1 — General instructions for completing MSHA Form 7000-2.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-D/section-50.30-1

## Source coverage

- **Accident, Injuries, and Illnesses:** 21 rows; 2000-10-20 through 2024-01-23; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1973-04-26 through 1973-04-26; source ID `msha-addresses`
- **Assessed Violations:** 174 rows; 2000-08-29 through 2026-08-04; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 28 rows; 2007-04-02 through 2017-08-30; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 2 rows; 2015-01-06 through 2015-01-06; source ID `msha-conferences`
- **Contested Violations:** 28 rows; 2006-05-02 through 2017-02-22; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 238 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 65 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 1950-01-01 through 2009-03-29; source ID `msha-controller-operator-history`
- **Inspections:** 76 rows; 2000-08-29 through 2026-07-30; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 35 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 66 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; 2001-02-14 through 2026-08-05; source ID `msha-personal-health-samples`
- **Violations:** 174 rows; 2000-08-29 through 2026-08-04; 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/clayton-plant-0400173`
- JSON: `/api/v1/mines/clayton-plant-0400173`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0400173/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0400173/relationships`
- MCP resource: `mine://0400173/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`