# Littlerock Quarry

- **MSHA mine ID:** 0404802
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Los Angeles, CA
- **Operator:** Hi-Grade Materials Co
- **Controller:** Robar Enterprises Inc
- **Public source rows linked:** 1,223
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Robar Enterprises Inc (M06755) → Hi-Grade Materials Co (L08509) → Littlerock Quarry (0404802)**

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

## Controller and operator valid-time history

- **Robar Enterprises Inc → Hi-Grade Materials Co:** 1986-03-01 through current/open; derived from co-tenure at mine 0404802; 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: 2026-10-13T11:19:05.459773+00:00.

## Assessment signals

1. **SAFETY — 3 since 2021:** Accidents and injuries 26 historical accident/injury rows; 1 coded fatalities and 1,277 lost days across the published record.
2. **COMPLIANCE — 60 since 2021:** Violations and penalties 267 violation rows across the full record; 94 carry an S&S flag and $112,934 appears in current assessed amounts.
3. **HEALTH — 25 samples:** Occupational health samples 25 personal. 1 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 15K employee hours and 25 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 50 linked rows:** Contests, conferences and decisions 25 contested-violation rows, 23 civil-penalty docket/decision rows, and 2 conference records linked by issuance number.
6. **CONTRACTORS — 2 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 — 36 since 2021:** Inspections 123 inspection events and 2K 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 56.20010 — Retaining dams.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20010
- **30 CFR 50.30 — Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-D/section-50.30
- **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 56.12008 — 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 56.14100 — 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 56.4203 — Extinguisher recharging or replacement.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4203
- **30 CFR 56.11012 — Protection for openings around travelways.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11012
- **30 CFR 56.11003 — Construction and maintenance of ladders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11003
- **30 CFR 56.16006 — Protection of gas cylinder valves.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16006
- **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
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 26 rows; 2000-09-08 through 2024-06-14; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1986-04-22 through 1986-04-22; source ID `msha-addresses`
- **Assessed Violations:** 263 rows; 2001-03-26 through 2026-06-17; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 23 rows; 2004-11-29 through 2018-09-28; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 2 rows; 2020-03-03 through 2024-09-17; source ID `msha-conferences`
- **Contested Violations:** 25 rows; 2004-06-03 through 2018-03-15; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 184 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 24 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 1 rows; 1986-03-01 through 1986-03-01; source ID `msha-controller-operator-history`
- **Inspections:** 123 rows; 2001-03-26 through 2026-07-23; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 205 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 53 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:** 25 rows; 2001-03-27 through 2026-04-29; source ID `msha-personal-health-samples`
- **Violations:** 267 rows; 2001-03-26 through 2026-06-17; 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/littlerock-quarry-0404802`
- JSON: `/api/v1/mines/littlerock-quarry-0404802`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0404802/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0404802/relationships`
- MCP resource: `mine://0404802/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`