# San Andreas Aggregates

- **MSHA mine ID:** 0400539
- **Status:** Abandoned
- **Type / commodity:** Surface / Crushed, Broken Stone NEC
- **Location:** Calaveras, CA
- **Operator:** Martin Marietta Northern California Aggregates,LLC
- **Controller:** Martin Marietta Materials Inc
- **Public source rows linked:** 688
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Martin Marietta Materials Inc (M00174) → Martin Marietta Northern California Aggregates,LLC (0064607) → San Andreas Aggregates (0400539)**

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

## Controller and operator valid-time history

- **Flintkote Company → Flintkote Company:** 1950-01-01 through 1980-04-06; derived from co-tenure at mine 0400539; source `msha-controller-operator-history`.
- **Cimenteries Cbr Cementbedrijven → Calaveras Materials Inc:** 1980-04-07 through 1999-05-26; derived from co-tenure at mine 0400539; source `msha-controller-operator-history`.
- **Heidelberg Materials AG → Lehigh Cement West, LLC:** 1999-05-27 through 2021-09-30; derived from co-tenure at mine 0400539; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Lehigh Cement West, LLC:** 2021-10-01 through 2023-01-19; derived from co-tenure at mine 0400539; source `msha-controller-operator-history`.
- **Heidelberg Materials AG → Martin Marietta Northern California Aggregates,LLC:** 2023-01-20 through 2021-09-30; derived from co-tenure at mine 0400539; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Northern California Aggregates,LLC:** 2023-01-20 through current/open; derived from co-tenure at mine 0400539; source `msha-controller-operator-history`.
- **Hanson PLC → Martin Marietta Northern California Aggregates,LLC:** 2023-01-20 through 2007-08-22; derived from co-tenure at mine 0400539; source `msha-controller-operator-history`.

- History rows: 7
- Typed edges: 17
- Interval anomalies: 2
- 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 2 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 8 since 2021:** Violations and penalties 102 violation rows across the full record; 23 carry an S&S flag and $15,287 appears in current assessed amounts.
3. **HEALTH — 12 samples:** Occupational health samples 12 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 705 employee hours and 2 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 14 linked rows:** Contests, conferences and decisions 5 contested-violation rows, 7 civil-penalty docket/decision rows, and 2 conference records linked by issuance number.
6. **CONTRACTORS — 3 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 — 9 since 2021:** Inspections 59 inspection events and 807 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 56.12018 — 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
- **30 CFR 56.20003 — Housekeeping.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **30 CFR 56.11027 — Scaffolds and working platforms.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11027
- **30 CFR 56.9301 — Dump site restraints.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9301
- **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 56.11001 — 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 56.14107 — 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 56.4130 — Electric substations and liquid storage facilities.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4130
- **30 CFR 56.14132 — Horns and backup alarms.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **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

- **Accident, Injuries, and Illnesses:** 2 rows; 2003-04-26 through 2018-09-26; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2024-12-31 through 2024-12-31; source ID `msha-addresses`
- **Assessed Violations:** 102 rows; 2001-04-24 through 2024-10-31; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 7 rows; 2004-02-20 through 2015-02-27; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 2 rows; 2011-05-06 through 2011-05-06; source ID `msha-conferences`
- **Contested Violations:** 5 rows; 2010-06-15 through 2014-05-07; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 114 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 28 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 7 rows; 1950-01-01 through 2023-01-20; source ID `msha-controller-operator-history`
- **Inspections:** 59 rows; 2000-09-13 through 2024-10-31; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 196 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:** 12 rows; 2001-04-26 through 2013-08-13; source ID `msha-personal-health-samples`
- **Violations:** 102 rows; 2001-04-24 through 2024-10-31; 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/san-andreas-aggregates-0400539`
- JSON: `/api/v1/mines/san-andreas-aggregates-0400539`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0400539/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0400539/relationships`
- MCP resource: `mine://0400539/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`