# CUSHENBURY PLANT

- **MSHA mine ID:** 0400157
- **Status:** Active
- **Type / commodity:** Facility / Cement
- **Location:** San Bernardino, CA
- **Operator:** MITSUBISHI CEMENT CORP
- **Controller:** Mitsubishi Corp
- **Public source rows linked:** 8,805
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Mitsubishi Corp (M07893) → MITSUBISHI CEMENT CORP (L10104) → CUSHENBURY PLANT (0400157)**

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

## Controller and operator valid-time history

- **Kaiser Cement Corp → Kaiser Cement Corp:** 1950-01-01 through 1987-03-02; derived from co-tenure at mine 0400157; source `msha-controller-operator-history`.
- **Hanson PLC → Kaiser Cement Corp:** 1987-03-03 through 1988-03-30; derived from co-tenure at mine 0400157; source `msha-controller-operator-history`.
- **Mitsubishi Corp → Mitsubishi Cement Corp:** 1988-03-31 through current/open; derived from co-tenure at mine 0400157; source `msha-controller-operator-history`.

- History rows: 3
- Typed edges: 9
- 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 — 23 since 2021:** Accidents and injuries 210 historical accident/injury rows; 1 coded fatalities and 5,536 lost days across the published record.
2. **COMPLIANCE — 223 since 2021:** Violations and penalties 1,089 violation rows across the full record; 212 carry an S&S flag and $428,685 appears in current assessed amounts.
3. **HEALTH — 35 samples:** Occupational health samples 35 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 65K employee hours and 198 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 473 linked rows:** Contests, conferences and decisions 196 contested-violation rows, 196 civil-penalty docket/decision rows, and 81 conference records linked by issuance number.
6. **CONTRACTORS — 36 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 — 20 since 2021:** Inspections 107 inspection events and 7K 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 56.12018 — 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 56.14112 — Construction and maintenance of guards.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **30 CFR 56.12008 — Insulation and fittings for power wires and cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12008
- **30 CFR 56.4102 — Spillage and leakage.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4102
- **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 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 56.20003 — 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 56.4011 — Abandoned electric circuits.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4011
- **30 CFR 56.16001 — Stacking and storage of materials.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16001

## Source coverage

- **Accident, Injuries, and Illnesses:** 210 rows; 2000-01-18 through 2025-10-02; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1988-08-09 through 1988-08-09; source ID `msha-addresses`
- **Assessed Violations:** 1,077 rows; 2001-05-23 through 2026-04-09; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 196 rows; 2007-11-06 through 2026-10-06; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 81 rows; 2001-07-30 through 2022-04-26; source ID `msha-conferences`
- **Contested Violations:** 196 rows; 2006-09-13 through 2026-04-02; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 4,508 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 903 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 1950-01-01 through 1988-03-31; source ID `msha-controller-operator-history`
- **Inspections:** 107 rows; 2000-02-04 through 2026-03-30; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 317 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 81 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:** 35 rows; 2002-09-17 through 2026-04-09; source ID `msha-personal-health-samples`
- **Violations:** 1,089 rows; 2001-05-23 through 2026-04-09; 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/cushenbury-plant-0400157`
- JSON: `/api/v1/mines/cushenbury-plant-0400157`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0400157/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0400157/relationships`
- MCP resource: `mine://0400157/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`