# Mount Emmons Project

- **MSHA mine ID:** 0500409
- **Status:** Abandoned
- **Type / commodity:** Underground / Molybdenum Ore
- **Location:** Gunnison, CO
- **Operator:** U.S. Energy Corp.
- **Controller:** U S Energy Corp
- **Public source rows linked:** 471
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**U S Energy Corp (M00804) → U.S. Energy Corp. (L00944) → Mount Emmons Project (0500409)**

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

## Controller and operator valid-time history

- **Cyprus Amax Minerals Company → Mount Emmons Mining Company:** 1950-01-01 through 2002-07-25; derived from co-tenure at mine 0500409; source `msha-controller-operator-history`.
- **Phelps Dodge Corp → Mount Emmons Mining Company:** 2002-07-26 through 2007-04-02; derived from co-tenure at mine 0500409; source `msha-controller-operator-history`.
- **U S Energy Corp → Kobex Colorado Corporation:** 2007-04-03 through 2008-05-06; derived from co-tenure at mine 0500409; source `msha-controller-operator-history`.
- **U S Energy Corp → U. S. Energy Corp.:** 2008-05-07 through 2008-12-29; derived from co-tenure at mine 0500409; source `msha-controller-operator-history`.
- **Thompson Creek Metals Co USA → Mt Emmons Moly Company:** 2008-12-30 through 2011-05-03; derived from co-tenure at mine 0500409; source `msha-controller-operator-history`.
- **U S Energy Corp → U.S. Energy Corp.:** 2011-05-04 through current/open; derived from co-tenure at mine 0500409; 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 — 0 since 2021:** Accidents and injuries 1 historical accident/injury rows; 0 coded fatalities and 164 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 1 violation rows across the full record; 1 carry an S&S flag and $108 appears in current assessed amounts.
3. **HEALTH — 0 samples:** Occupational health samples No published samples. 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 0 employee hours and 0 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 2 linked rows:** Contests, conferences and decisions 1 contested-violation rows, 1 civil-penalty docket/decision rows, and 0 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 — 0 since 2021:** Inspections 8 inspection events and 86 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 49.2 — Availability of mine rescue teams.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-49/subpart-A/section-49.2

## Source coverage

- **Accident, Injuries, and Illnesses:** 1 rows; 2010-11-01 through 2010-11-01; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2014-01-29 through 2014-01-29; source ID `msha-addresses`
- **Assessed Violations:** 1 rows; 2008-01-28 through 2008-01-28; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 1 rows; 2008-09-30 through 2008-09-30; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 1 rows; 2008-01-28 through 2008-01-28; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 373 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 46 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 6 rows; 1950-01-01 through 2011-05-04; source ID `msha-controller-operator-history`
- **Inspections:** 8 rows; 2008-01-28 through 2013-12-11; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 24 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 7 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Violations:** 1 rows; 2008-01-28 through 2008-01-28; 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/mount-emmons-project-0500409`
- JSON: `/api/v1/mines/mount-emmons-project-0500409`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0500409/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0500409/relationships`
- MCP resource: `mine://0500409/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`