# HJ HOVE

- **MSHA mine ID:** 0401854
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Riverside, CA
- **Operator:** HI-GRADE MATERIALS CO.
- **Controller:** Robar Enterprises Inc
- **Public source rows linked:** 1,086
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Robar Enterprises Inc (M06755) → HI-GRADE MATERIALS CO. (L08509) → HJ HOVE (0401854)**

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

## Controller and operator valid-time history

- **Ellis Transportation → Massey Sand & Rock Company:** 1950-01-01 through 1986-12-26; derived from co-tenure at mine 0401854; source `msha-controller-operator-history`.
- **Tarmac Plc → Tarmac California Inc:** 1986-12-27 through 1992-06-21; derived from co-tenure at mine 0401854; source `msha-controller-operator-history`.
- **Granite Construction Inc → Granite Construction Company:** 1992-06-22 through 2017-01-02; derived from co-tenure at mine 0401854; source `msha-controller-operator-history`.
- **Robar Enterprises Inc → Hi-Grade Materials Co.:** 2017-01-03 through current/open; derived from co-tenure at mine 0401854; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 12
- 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 — 0 since 2021:** Accidents and injuries 10 historical accident/injury rows; 1 coded fatalities and 371 lost days across the published record.
2. **COMPLIANCE — 42 since 2021:** Violations and penalties 248 violation rows across the full record; 60 carry an S&S flag and $186,665 appears in current assessed amounts.
3. **HEALTH — 15 samples:** Occupational health samples 15 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 11K employee hours and 19 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 17 linked rows:** Contests, conferences and decisions 9 contested-violation rows, 7 civil-penalty docket/decision rows, and 1 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 — 18 since 2021:** Inspections 77 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 46.6 — Newly hired experienced miner training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.6
- **30 CFR 56.12004 — Electrical conductors.** (2 retained recent rows) — 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 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 56.14107 — 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 56.12030 — Correction of dangerous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12030
- **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 56.14205 — 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 46.9 — Records of training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.9

## Source coverage

- **Accident, Injuries, and Illnesses:** 10 rows; 2001-10-12 through 2020-08-18; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2017-06-15 through 2017-06-15; source ID `msha-addresses`
- **Assessed Violations:** 247 rows; 2000-06-28 through 2026-05-05; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 7 rows; 2008-08-06 through 2024-05-30; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 1 rows; 2003-02-25 through 2003-02-25; source ID `msha-conferences`
- **Contested Violations:** 9 rows; 2007-10-16 through 2023-12-21; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 186 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 36 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1950-01-01 through 2017-01-03; source ID `msha-controller-operator-history`
- **Inspections:** 77 rows; 2000-06-28 through 2026-05-04; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 194 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 50 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:** 15 rows; 2004-06-21 through 2026-01-15; source ID `msha-personal-health-samples`
- **Violations:** 248 rows; 2000-06-28 through 2026-05-05; 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/hj-hove-0401854`
- JSON: `/api/v1/mines/hj-hove-0401854`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0401854/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0401854/relationships`
- MCP resource: `mine://0401854/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`