# Coolidge Plant 65

- **MSHA mine ID:** 0203173
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Pinal, AZ
- **Operator:** Martin Marietta Arizona, LLC
- **Controller:** Martin Marietta Materials Inc
- **Public source rows linked:** 1,057
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Martin Marietta Materials Inc (M00174) → Martin Marietta Arizona, LLC (0187053) → Coolidge Plant 65 (0203173)**

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

## Controller and operator valid-time history

- **Hanson PLC → Hanson Aggregates Arizona, Inc:** 2007-05-01 through 2007-08-22; derived from co-tenure at mine 0203173; source `msha-controller-operator-history`.
- **Heidelberg Materials AG → Hanson Aggregates Arizona, Inc:** 2007-08-23 through 2010-05-02; derived from co-tenure at mine 0203173; source `msha-controller-operator-history`.
- **Heidelberg Materials AG → Hanson Aggregates LLC:** 2010-05-03 through 2021-09-30; derived from co-tenure at mine 0203173; source `msha-controller-operator-history`.
- **Hanson PLC → Hanson Aggregates LLC:** 2010-05-03 through 2007-08-22; derived from co-tenure at mine 0203173; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Hanson Aggregates LLC:** 2021-10-01 through 2022-05-29; derived from co-tenure at mine 0203173; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Materials, Inc:** 2022-05-30 through 2022-12-20; derived from co-tenure at mine 0203173; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Arizona, LLC:** 2022-12-21 through current/open; derived from co-tenure at mine 0203173; source `msha-controller-operator-history`.

- History rows: 7
- Typed edges: 18
- Interval anomalies: 1
- 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 1 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 5 since 2021:** Violations and penalties 28 violation rows across the full record; 4 carry an S&S flag and $8,092 appears in current assessed amounts.
3. **HEALTH — 14 samples:** Occupational health samples 14 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 8K employee hours and 14 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 16 linked rows:** Contests, conferences and decisions 5 contested-violation rows, 5 civil-penalty docket/decision rows, and 6 conference records linked by issuance number.
6. **CONTRACTORS — 1 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 — 13 since 2021:** Inspections 27 inspection events and 320 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 56.12034 — Guarding around lights.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12034
- **30 CFR 56.14206 — Securing movable parts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14206
- **30 CFR 56.4201 — Inspection.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4201
- **30 CFR 56.14109 — Unguarded conveyors with adjacent travelways.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14109
- **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 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 56.12002 — 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 50.30 — Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-D/section-50.30
- **30 CFR 56.15006 — Protective equipment and clothing for hazards and irritants.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15006
- **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 56.15002 — Hard hats.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15002
- **30 CFR 56.14211 — Blocking equipment in a raised position.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14211

## Source coverage

- **Accident, Injuries, and Illnesses:** 1 rows; 2020-03-04 through 2020-03-04; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2020-10-29 through 2020-10-29; source ID `msha-addresses`
- **Assessed Violations:** 28 rows; 2007-06-12 through 2024-10-01; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 5 rows; 2010-09-27 through 2012-07-18; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 6 rows; 2007-08-06 through 2007-08-06; source ID `msha-conferences`
- **Contested Violations:** 5 rows; 2009-11-12 through 2011-06-01; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 705 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 142 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 7 rows; 2007-05-01 through 2022-12-21; source ID `msha-controller-operator-history`
- **Inspections:** 27 rows; 2007-06-11 through 2026-09-10; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 70 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 17 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:** 14 rows; 2009-11-24 through 2024-10-02; source ID `msha-personal-health-samples`
- **Violations:** 28 rows; 2007-06-12 through 2024-10-01; 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/coolidge-plant-65-0203173`
- JSON: `/api/v1/mines/coolidge-plant-65-0203173`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0203173/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0203173/relationships`
- MCP resource: `mine://0203173/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`