# River Rock Plant

- **MSHA mine ID:** 0401711
- **Status:** Abandoned
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Fresno, CA
- **Operator:** CalMat Co
- **Controller:** Vulcan Materials Company
- **Public source rows linked:** 981
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Vulcan Materials Company (0071891) → CalMat Co (L16645) → River Rock Plant (0401711)**

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

## Controller and operator valid-time history

- **D M  Underdown → River Rock Products:** 1950-01-01 through 1988-10-31; derived from co-tenure at mine 0401711; source `msha-controller-operator-history`.
- **Calmat Company → Calmat Of Central California:** 1988-11-01 through 1999-01-05; derived from co-tenure at mine 0401711; source `msha-controller-operator-history`.
- **Legacy Vulcan Corp (Form:Vulcan Materials Co) → CalMat Co:** 1999-01-06 through 2007-11-15; derived from co-tenure at mine 0401711; source `msha-controller-operator-history`.
- **Vulcan Materials Company → CalMat Co:** 2007-11-16 through current/open; derived from co-tenure at mine 0401711; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 11
- 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 19 historical accident/injury rows; 0 coded fatalities and 400 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 128 violation rows across the full record; 23 carry an S&S flag and $17,707 appears in current assessed amounts.
3. **HEALTH — 31 samples:** Occupational health samples 31 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 352 employee hours and 1 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 14 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 civil-penalty docket/decision rows, and 14 conference records linked by issuance number.
6. **CONTRACTORS — 11 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 — 0 since 2021:** Inspections 52 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 56.4402 — 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 56.14101 — Brakes.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14101
- **30 CFR 56.14132 — Horns and backup alarms.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **30 CFR 46.11 — Site-specific hazard awareness training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.11
- **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 46.5 — New miner training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.5
- **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 56.12004 — 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 56.14107 — 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

## Source coverage

- **Accident, Injuries, and Illnesses:** 19 rows; 2000-06-20 through 2017-07-14; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2021-07-01 through 2021-07-01; source ID `msha-addresses`
- **Assessed Violations:** 128 rows; 2001-04-03 through 2019-02-07; source ID `msha-assessed-violations`
- **Conferences:** 14 rows; 2003-10-09 through 2013-11-01; source ID `msha-conferences`
- **Contractor Employment and Production — Quarterly:** 317 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 86 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1950-01-01 through 1999-01-06; source ID `msha-controller-operator-history`
- **Inspections:** 52 rows; 2001-03-27 through 2020-02-10; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 160 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 40 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:** 31 rows; 2001-04-03 through 2017-02-14; source ID `msha-personal-health-samples`
- **Violations:** 128 rows; 2001-04-03 through 2019-02-07; 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/river-rock-plant-0401711`
- JSON: `/api/v1/mines/river-rock-plant-0401711`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0401711/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0401711/relationships`
- MCP resource: `mine://0401711/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`