# Patterson Plant

- **MSHA mine ID:** 0401906
- **Status:** Abandoned
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Placer, CA
- **Operator:** CEMEX Construction Materials Pacific, LLC
- **Controller:** Cemex S A
- **Public source rows linked:** 835
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Cemex S A (M09149) → CEMEX Construction Materials Pacific, LLC (0103149) → Patterson Plant (0401906)**

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

## Controller and operator valid-time history

- **Darren  Morehead → Patterson Sand & Gravel:** 1950-01-01 through 1999-10-25; derived from co-tenure at mine 0401906; source `msha-controller-operator-history`.
- **RMC Group PLC → Automatic Aggregate System Inc:** 1999-10-26 through 2006-02-05; derived from co-tenure at mine 0401906; source `msha-controller-operator-history`.
- **Cemex S A → CEMEX Construction Materials LP:** 2006-02-06 through 2013-03-31; derived from co-tenure at mine 0401906; source `msha-controller-operator-history`.
- **Cemex S A → CEMEX Construction Materials Pacific, LLC:** 2013-04-01 through current/open; derived from co-tenure at mine 0401906; 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 29 historical accident/injury rows; 0 coded fatalities and 448 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 210 violation rows across the full record; 75 carry an S&S flag and $84,385 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 1K employee hours and 4 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 11 linked rows:** Contests, conferences and decisions 5 contested-violation rows, 5 civil-penalty docket/decision rows, and 1 conference records linked by issuance number.
6. **CONTRACTORS — 3 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 64 inspection events and 877 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 56.20003 — Housekeeping.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **30 CFR 56.14112 — Construction and maintenance of guards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **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 56.14100 — 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 56.12030 — Correction of dangerous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12030
- **30 CFR 56.14107 — Moving machine parts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **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 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 46.3 — Training plans.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.3
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 29 rows; 2000-01-18 through 2016-11-26; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2020-11-04 through 2020-11-04; source ID `msha-addresses`
- **Assessed Violations:** 205 rows; 2000-06-06 through 2019-12-18; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 5 rows; 2011-05-11 through 2011-05-11; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 1 rows; 2016-07-18 through 2016-07-18; source ID `msha-conferences`
- **Contested Violations:** 5 rows; 2009-04-21 through 2009-04-22; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 93 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 22 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1950-01-01 through 2013-04-01; source ID `msha-controller-operator-history`
- **Inspections:** 64 rows; 2000-06-06 through 2021-06-28; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 130 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 36 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; 2001-05-02 through 2016-02-17; source ID `msha-personal-health-samples`
- **Violations:** 210 rows; 2000-06-06 through 2019-12-18; 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/patterson-plant-0401906`
- JSON: `/api/v1/mines/patterson-plant-0401906`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0401906/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0401906/relationships`
- MCP resource: `mine://0401906/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`