# Juniper Flats

- **MSHA mine ID:** 0405097
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Riverside, CA
- **Operator:** Robertson's
- **Controller:** RRM Development Corporation; Mitsubishi Corp
- **Public source rows linked:** 564
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**RRM Development Corporation; Mitsubishi Corp (M11611) → Robertson's (L14361) → Juniper Flats (0405097)**

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

## Controller and operator valid-time history

- **Ronald W Pharris → C L Pharris Sand & Gravel Inc:** 1990-06-01 through 1992-01-17; derived from co-tenure at mine 0405097; source `msha-controller-operator-history`.
- **Cemex S A → C L Pharris Sand & Gravel Inc:** 1992-01-18 through 2009-11-12; derived from co-tenure at mine 0405097; source `msha-controller-operator-history`.
- **Primoris Services Corporation → Juniper Rock Corporation:** 2009-11-13 through 2023-01-06; derived from co-tenure at mine 0405097; source `msha-controller-operator-history`.
- **RRM Development Corporation et al → Robertson's:** 2023-01-07 through current/open; derived from co-tenure at mine 0405097; source `msha-controller-operator-history`.
- **Mitsubishi Corp  et al → Robertson's:** 2023-01-07 through current/open; derived from co-tenure at mine 0405097; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 13
- 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 0 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 19 since 2021:** Violations and penalties 46 violation rows across the full record; 10 carry an S&S flag and $9,831 appears in current assessed amounts.
3. **HEALTH — 5 samples:** Occupational health samples 5 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 7K employee hours and 10 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 46 linked rows:** Contests, conferences and decisions 23 contested-violation rows, 23 civil-penalty docket/decision rows, and 0 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 — 11 since 2021:** Inspections 25 inspection events and 364 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 56.4200 — General requirements.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4200
- **30 CFR 56.14107 — Moving machine parts.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **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 56.14100 — 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 56.4101 — Warning signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4101
- **30 CFR 56.14207 — Parking procedures for unattended equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14207
- **30 CFR 56.18002 — Examination of working places.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18002
- **30 CFR 56.12002 — Controls and switches.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12002
- **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 56.12004 — Electrical conductors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004

## Source coverage

- **Addresses of Record:** 1 rows; 2020-01-02 through 2020-01-02; source ID `msha-addresses`
- **Assessed Violations:** 46 rows; 2010-06-02 through 2026-05-13; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 23 rows; 2011-06-15 through 2023-11-27; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 23 rows; 2010-06-02 through 2023-07-13; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 210 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 41 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 1990-06-01 through 2023-01-07; source ID `msha-controller-operator-history`
- **Inspections:** 25 rows; 2010-01-14 through 2026-05-13; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 106 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 32 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:** 5 rows; 2019-04-04 through 2025-10-30; source ID `msha-personal-health-samples`
- **Violations:** 46 rows; 2010-06-02 through 2026-05-13; 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/juniper-flats-0405097`
- JSON: `/api/v1/mines/juniper-flats-0405097`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0405097/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0405097/relationships`
- MCP resource: `mine://0405097/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`