# Palmdale

- **MSHA mine ID:** 0404803
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Los Angeles, CA
- **Operator:** Robertson's
- **Controller:** RRM Development Corporation; Mitsubishi Corp
- **Public source rows linked:** 514
- **Source coverage:** 12 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**RRM Development Corporation; Mitsubishi Corp (M11611) → Robertson's (L14361) → Palmdale (0404803)**

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

## Controller and operator valid-time history

- **Frank R  Walker Jr → Arrow Rock Materials:** 1985-07-01 through 1988-12-01; derived from co-tenure at mine 0404803; source `msha-controller-operator-history`.
- **Mitsubishi Corp → Service Rock Products:** 1988-12-02 through 2010-02-07; derived from co-tenure at mine 0404803; source `msha-controller-operator-history`.
- **RRM Development Corporation et al → Robertson's:** 2010-02-08 through current/open; derived from co-tenure at mine 0404803; source `msha-controller-operator-history`.
- **Mitsubishi Corp  et al → Robertson's:** 2010-02-08 through current/open; derived from co-tenure at mine 0404803; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 10
- 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 — 2 since 2021:** Accidents and injuries 18 historical accident/injury rows; 0 coded fatalities and 314 lost days across the published record.
2. **COMPLIANCE — 12 since 2021:** Violations and penalties 72 violation rows across the full record; 11 carry an S&S flag and $7,853 appears in current assessed amounts.
3. **HEALTH — 19 samples:** Occupational health samples 19 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 6K employee hours and 10 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 2 linked rows:** Contests, conferences and decisions 1 contested-violation rows, 1 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
6. **CONTRACTORS — 0 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 — 13 since 2021:** Inspections 60 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 56.23003 — Requirements for written safety program.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-T/section-56.23003
- **30 CFR 56.12008 — Insulation and fittings for power wires and cables.** (4 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12008
- **30 CFR 56.12032 — Inspection and cover plates.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **30 CFR 56.14130 — Roll-over protective structures (ROPS) and seat belts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14130
- **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 56.4102 — 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 56.12004 — 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
- **30 CFR 56.14205 — Machinery, equipment, and tools.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14205

## Source coverage

- **Accident, Injuries, and Illnesses:** 18 rows; 2000-10-04 through 2026-06-11; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1988-04-18 through 1988-04-18; source ID `msha-addresses`
- **Assessed Violations:** 71 rows; 2001-09-04 through 2026-08-20; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 1 rows; 2022-05-09 through 2022-05-09; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 1 rows; 2021-12-15 through 2021-12-15; source ID `msha-contested-violations`
- **Controller and Operator History:** 4 rows; 1985-07-01 through 2010-02-08; source ID `msha-controller-operator-history`
- **Inspections:** 60 rows; 2001-03-28 through 2026-08-20; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 212 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 54 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:** 19 rows; 2004-07-06 through 2023-08-17; source ID `msha-personal-health-samples`
- **Violations:** 72 rows; 2001-09-04 through 2026-08-20; 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/palmdale-0404803`
- JSON: `/api/v1/mines/palmdale-0404803`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0404803/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0404803/relationships`
- MCP resource: `mine://0404803/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`