# Relationship history for MSHA mine 0500409

Current hierarchy: **U S Energy Corp → U.S. Energy Corp. → Mount Emmons Project**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Mount Emmons Mining Company → Mount Emmons Project; 1950-01-01 to 2007-04-02; source msha-controller-operator-history
- **controller_controls_mine:** U S Energy Corp → Mount Emmons Project; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Mount Emmons Project; 1950-01-01 to 2002-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Mount Emmons Mining Company; 1950-01-01 to 2002-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Phelps Dodge Corp → Mount Emmons Project; 2002-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phelps Dodge Corp → Mount Emmons Mining Company; 2002-07-26 to 2007-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Kobex Colorado Corporation → Mount Emmons Project; 2007-04-03 to 2008-05-06; source msha-controller-operator-history
- **controller_controls_mine:** U S Energy Corp → Mount Emmons Project; 2007-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Energy Corp → Kobex Colorado Corporation; 2007-04-03 to 2008-05-06; source msha-controller-operator-history
- **operator_operates_mine:** U. S. Energy Corp. → Mount Emmons Project; 2008-05-07 to 2008-12-29; source msha-controller-operator-history
- **controller_controls_operator:** U S Energy Corp → U. S. Energy Corp.; 2008-05-07 to 2008-12-29; source msha-controller-operator-history
- **operator_operates_mine:** Mt Emmons Moly Company → Mount Emmons Project; 2008-12-30 to 2011-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Thompson Creek Metals Co USA → Mount Emmons Project; 2008-12-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Creek Metals Co USA → Mt Emmons Moly Company; 2008-12-30 to 2011-05-03; source msha-controller-operator-history
- **operator_operates_mine:** U.S. Energy Corp. → Mount Emmons Project; 2011-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Energy Corp → U.S. Energy Corp.; 2011-05-04 to current/open; source msha-controller-operator-history