# Dewey Plant

- **MSHA mine ID:** 0202633
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Yavapai, AZ
- **Operator:** MDI Mining
- **Controller:** Michael  Denny
- **Public source rows linked:** 1,120
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Michael  Denny (M11607) → MDI Mining (L15229) → Dewey Plant (0202633)**

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

## Controller and operator valid-time history

- **Richard  Halliburton et al → Mingus Rock:** 1994-09-01 through 1997-07-13; derived from co-tenure at mine 0202633; source `msha-controller-operator-history`.
- **Michael  Denny → MDI Mining:** 1997-07-14 through current/open; derived from co-tenure at mine 0202633; source `msha-controller-operator-history`.

- History rows: 2
- Typed edges: 6
- 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 4 historical accident/injury rows; 0 coded fatalities and 6 lost days across the published record.
2. **COMPLIANCE — 39 since 2021:** Violations and penalties 305 violation rows across the full record; 109 carry an S&S flag and $94,682 appears in current assessed amounts.
3. **HEALTH — 57 samples:** Occupational health samples 57 personal. 4 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 12 employee hours and 1 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 46 linked rows:** Contests, conferences and decisions 18 contested-violation rows, 18 civil-penalty docket/decision rows, and 10 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 — 22 since 2021:** Inspections 104 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 56.14100 — Safety defects; examination, correction and records.** (4 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 46.9 — Records of training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.9
- **30 CFR 56.15001 — First-aid materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15001
- **30 CFR 56.14205 — Machinery, equipment, and tools.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14205
- **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 56.4104 — Combustible waste.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4104
- **30 CFR 50.10 — Immediate notification.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-B/section-50.10
- **30 CFR 56.6306 — Loading, blasting, and security.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-E/section-56.6306

## Source coverage

- **Accident, Injuries, and Illnesses:** 4 rows; 2006-12-07 through 2020-08-10; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1994-11-18 through 1994-11-18; source ID `msha-addresses`
- **Assessed Violations:** 300 rows; 2000-12-06 through 2026-04-02; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 18 rows; 2014-12-03 through 2026-07-20; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 10 rows; 2004-11-04 through 2008-12-23; source ID `msha-conferences`
- **Contested Violations:** 18 rows; 2014-04-16 through 2024-05-29; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 4 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 2 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 2 rows; 1994-09-01 through 1997-07-14; source ID `msha-controller-operator-history`
- **Inspections:** 104 rows; 2000-12-06 through 2026-06-01; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 237 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 57 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:** 57 rows; 2004-10-13 through 2026-04-02; source ID `msha-personal-health-samples`
- **Violations:** 305 rows; 2000-12-06 through 2026-04-02; 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/dewey-plant-0202633`
- JSON: `/api/v1/mines/dewey-plant-0202633`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0202633/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0202633/relationships`
- MCP resource: `mine://0202633/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`