# Lucerne Valley Plant and Quarry

- **MSHA mine ID:** 0400219
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** San Bernardino, CA
- **Operator:** Specialty Minerals Inc
- **Controller:** Minerals Technologies Inc
- **Public source rows linked:** 4,144
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-18T09:31:49.615Z

## Current entity hierarchy

**Minerals Technologies Inc (M00362) → Specialty Minerals Inc (L12908) → Lucerne Valley Plant and Quarry (0400219)**

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

## Controller and operator valid-time history

- **Minerals Technologies Inc → Specialty Minerals Inc:** 1950-01-01 through current/open; derived from co-tenure at mine 0400219; source `msha-controller-operator-history`.

- History rows: 1
- Typed edges: 3
- 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: 2026-10-18T09:31:49.615908+00:00.

## Assessment signals

1. **SAFETY — 19 since 2021:** Accidents and injuries 121 historical accident/injury rows; 0 coded fatalities and 2,364 lost days across the published record.
2. **COMPLIANCE — 128 since 2021:** Violations and penalties 607 violation rows across the full record; 145 carry an S&S flag and $261,362 appears in current assessed amounts.
3. **HEALTH — 34 samples:** Occupational health samples 34 personal. 13 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 41K employee hours and 75 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 174 linked rows:** Contests, conferences and decisions 67 contested-violation rows, 67 civil-penalty docket/decision rows, and 40 conference records linked by issuance number.
6. **CONTRACTORS — 15 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 — 21 since 2021:** Inspections 89 inspection events and 4K 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 56.12028 — Testing grounding systems.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12028
- **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 56.14112 — 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.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12008
- **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 56.16003 — Storage of hazardous materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16003
- **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 56.12018 — 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 56.12004 — 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 56.14101 — Brakes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14101

## Source coverage

- **Accident, Injuries, and Illnesses:** 121 rows; 2000-02-09 through 2025-07-10; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1987-03-24 through 1987-03-24; source ID `msha-addresses`
- **Assessed Violations:** 605 rows; 2000-05-15 through 2026-06-24; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 67 rows; 2005-03-16 through 2014-07-29; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 40 rows; 2004-08-06 through 2016-11-30; source ID `msha-conferences`
- **Contested Violations:** 67 rows; 2004-06-21 through 2013-09-18; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,716 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 396 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 1 rows; 1950-01-01 through 1950-01-01; source ID `msha-controller-operator-history`
- **Inspections:** 89 rows; 2000-05-15 through 2026-06-08; 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:** 34 rows; 2002-02-06 through 2025-01-28; source ID `msha-personal-health-samples`
- **Violations:** 607 rows; 2000-05-15 through 2026-06-24; 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/lucerne-valley-plant-and-quarry-0400219`
- JSON: `/api/v1/mines/lucerne-valley-plant-and-quarry-0400219`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0400219/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0400219/relationships`
- MCP resource: `mine://0400219/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`