# Diamond J Corp

- **MSHA mine ID:** 0405457
- **Status:** Abandoned
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Lake, CA
- **Operator:** Diamond J Corporation
- **Controller:** Estate of David(Sam) Johnson; Brad  Johnson
- **Public source rows linked:** 284
- **Source coverage:** 10 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Estate of David(Sam) Johnson; Brad  Johnson (M11038) → Diamond J Corporation (0081204) → Diamond J Corp (0405457)**

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

## Controller and operator valid-time history

- **Brad  Johnson  et al → California Rock & Asphalt Inc:** 2000-09-01 through 2007-06-11; derived from co-tenure at mine 0405457; source `msha-controller-operator-history`.
- **Estate of David(Sam) Johnson et al → California Rock & Asphalt Inc:** 2000-09-01 through 2007-06-11; derived from co-tenure at mine 0405457; source `msha-controller-operator-history`.
- **Brad  Johnson  et al → Diamond J Corporation:** 2007-06-12 through current/open; derived from co-tenure at mine 0405457; source `msha-controller-operator-history`.
- **Estate of David(Sam) Johnson et al → Diamond J Corporation:** 2007-06-12 through current/open; derived from co-tenure at mine 0405457; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 8
- 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 3 historical accident/injury rows; 0 coded fatalities and 47 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 84 violation rows across the full record; 21 carry an S&S flag and $13,389 appears in current assessed amounts.
3. **HEALTH — 4 samples:** Occupational health samples 4 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 1K employee hours and 3 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 0 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 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 — 0 since 2021:** Inspections 31 inspection events and 337 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 56.1000 — Notification of commencement of operations and closing of mines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-A/section-56.1000
- **30 CFR 56.18010 — First aid.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18010
- **30 CFR 56.11001 — Safe access.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11001
- **30 CFR 56.11005 — Fixed ladder anchorage and toe clearance.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11005
- **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 56.14107 — 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 56.12004 — 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 56.4601 — Oxygen cylinder storage.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4601
- **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 56.14100 — 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 46.8 — Annual refresher training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.8

## Source coverage

- **Accident, Injuries, and Illnesses:** 3 rows; 2000-08-09 through 2001-07-24; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2010-12-29 through 2010-12-29; source ID `msha-addresses`
- **Assessed Violations:** 81 rows; 2000-09-06 through 2010-12-22; source ID `msha-assessed-violations`
- **Controller and Operator History:** 4 rows; 2000-09-01 through 2007-06-12; source ID `msha-controller-operator-history`
- **Inspections:** 31 rows; 2000-09-06 through 2010-12-21; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 64 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 11 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:** 4 rows; 2001-05-16 through 2009-12-15; source ID `msha-personal-health-samples`
- **Violations:** 84 rows; 2000-09-06 through 2010-12-22; 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/diamond-j-corp-0405457`
- JSON: `/api/v1/mines/diamond-j-corp-0405457`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0405457/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0405457/relationships`
- MCP resource: `mine://0405457/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`