# Mojave Plant & Quarry

- **MSHA mine ID:** 0400036
- **Status:** Active
- **Type / commodity:** Facility / Cement
- **Location:** Kern, CA
- **Operator:** Calportland
- **Controller:** Taiheiyo Cement Corp
- **Public source rows linked:** 8,735
- **Source coverage:** 16 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Taiheiyo Cement Corp (M07897) → Calportland (L11900) → Mojave Plant & Quarry (0400036)**

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

## Controller and operator valid-time history

- **California Portland Cement Company → California Portland Cement Company:** 1950-01-01 through 1984-07-18; derived from co-tenure at mine 0400036; source `msha-controller-operator-history`.
- **Calmat Company → California Portland Cement Company:** 1984-07-19 through 1990-09-30; derived from co-tenure at mine 0400036; source `msha-controller-operator-history`.
- **Taiheiyo Cement Corp → Calportland:** 1990-10-01 through current/open; derived from co-tenure at mine 0400036; 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 — 40 since 2021:** Accidents and injuries 252 historical accident/injury rows; 1 coded fatalities and 5,119 lost days across the published record.
2. **COMPLIANCE — 367 since 2021:** Violations and penalties 988 violation rows across the full record; 294 carry an S&S flag and $580,786 appears in current assessed amounts.
3. **HEALTH — 89 samples:** Occupational health samples 86 personal; 3 area. 3 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 77K employee hours and 156 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 148 linked rows:** Contests, conferences and decisions 55 contested-violation rows, 56 civil-penalty docket/decision rows, and 37 conference records linked by issuance number.
6. **CONTRACTORS — 46 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 — 39 since 2021:** Inspections 154 inspection events and 8K 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 56.18020 — Working alone.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18020
- **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 56.15005 — Safety belts and lines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15005
- **30 CFR 56.4402 — Safety can use.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4402
- **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 56.12004 — 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 47.41 — Requirement for container labels.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.41
- **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 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 56.14100 — 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

## Source coverage

- **Accident, Injuries, and Illnesses:** 252 rows; 2000-01-01 through 2026-06-17; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1975-04-10 through 1975-04-10; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 3 rows; 2004-08-11 through 2009-06-23; source ID `msha-area-samples`
- **Assessed Violations:** 978 rows; 2000-05-02 through 2026-06-22; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 56 rows; 2002-05-07 through 2025-05-08; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 37 rows; 2001-10-22 through 2025-03-07; source ID `msha-conferences`
- **Contested Violations:** 55 rows; 2008-02-20 through 2026-04-15; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 4,736 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 986 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 1950-01-01 through 1990-10-01; source ID `msha-controller-operator-history`
- **Inspections:** 154 rows; 2000-05-02 through 2026-06-22; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 318 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:** 86 rows; 2001-10-03 through 2026-04-23; source ID `msha-personal-health-samples`
- **Violations:** 988 rows; 2000-05-02 through 2026-06-22; 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/mojave-plant-quarry-0400036`
- JSON: `/api/v1/mines/mojave-plant-quarry-0400036`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0400036/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0400036/relationships`
- MCP resource: `mine://0400036/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`