# White Mesa Mill

- **MSHA mine ID:** 4201429
- **Status:** Active
- **Type / commodity:** Facility / Uranium Ore
- **Location:** San Juan, UT
- **Operator:** EFR White Mesa LLC
- **Controller:** Energy Fuels Inc
- **Public source rows linked:** 3,548
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Energy Fuels Inc (0175160) → EFR White Mesa LLC (0200613) → White Mesa Mill (4201429)**

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

## Controller and operator valid-time history

- **Harold  Roberts → Energy Fuels Nuclear Inc:** 1950-01-01 through 1984-01-08; derived from co-tenure at mine 4201429; source `msha-controller-operator-history`.
- **Umetco Minerals Corp et al → Umetco Minerals Corp:** 1984-01-09 through 1994-05-25; derived from co-tenure at mine 4201429; source `msha-controller-operator-history`.
- **Harold  Roberts → Energy Fuels Nuclear Inc:** 1994-05-26 through 1997-05-09; derived from co-tenure at mine 4201429; source `msha-controller-operator-history`.
- **International Uranium Corp → Energy Fuels Resources (USA) Inc.:** 1997-05-10 through 2023-02-12; derived from co-tenure at mine 4201429; source `msha-controller-operator-history`.
- **Energy Fuels Inc → Energy Fuels Resources (USA) Inc.:** 2023-02-13 through 2025-02-09; derived from co-tenure at mine 4201429; source `msha-controller-operator-history`.
- **Energy Fuels Inc → EFR White Mesa LLC:** 2025-02-10 through current/open; derived from co-tenure at mine 4201429; source `msha-controller-operator-history`.

- History rows: 6
- Typed edges: 16
- 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 — 14 since 2021:** Accidents and injuries 47 historical accident/injury rows; 0 coded fatalities and 90 lost days across the published record.
2. **COMPLIANCE — 37 since 2021:** Violations and penalties 325 violation rows across the full record; 63 carry an S&S flag and $116,964 appears in current assessed amounts.
3. **HEALTH — 135 samples:** Occupational health samples 135 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 54K employee hours and 113 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 9 linked rows:** Contests, conferences and decisions 4 contested-violation rows, 4 civil-penalty docket/decision rows, and 1 conference records linked by issuance number.
6. **CONTRACTORS — 15 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 — 14 since 2021:** Inspections 73 inspection events and 3K 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 56.12006 — Distribution boxes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12006
- **30 CFR 56.12032 — Inspection and cover plates.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **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 56.12030 — Correction of dangerous conditions.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12030
- **30 CFR 48.28 — Annual refresher training of miners; minimum courses of instruction; hours of instruction.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-B/section-48.28
- **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 47.41 — Requirement for container labels.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.41
- **30 CFR 56.14107 — Moving machine parts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **30 CFR 57.12006 — Distribution boxes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12006
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 47 rows; 2000-12-07 through 2026-03-17; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2015-05-27 through 2015-05-27; source ID `msha-addresses`
- **Assessed Violations:** 324 rows; 2000-01-26 through 2025-12-21; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2008-04-30 through 2011-07-20; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 1 rows; 2002-08-12 through 2002-08-12; source ID `msha-conferences`
- **Contested Violations:** 4 rows; 2005-11-30 through 2010-08-04; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,968 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 393 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 6 rows; 1950-01-01 through 2025-02-10; source ID `msha-controller-operator-history`
- **Inspections:** 73 rows; 2000-01-25 through 2026-05-04; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 212 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 54 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:** 135 rows; 2001-06-05 through 2025-03-25; source ID `msha-personal-health-samples`
- **Violations:** 325 rows; 2000-01-26 through 2025-12-21; 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/white-mesa-mill-4201429`
- JSON: `/api/v1/mines/white-mesa-mill-4201429`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4201429/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4201429/relationships`
- MCP resource: `mine://4201429/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`