# Relationship history for MSHA mine 0500294

Current hierarchy: **Oxbow Carbon LLC → Oxbow Mining, LLC → Elk Creek Surface Facilities**

- 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:** United States Steel Mining Company Inc → Elk Creek Surface Facilities; 1950-01-01 to 1985-12-29; source msha-controller-operator-history
- **controller_controls_mine:** Usx Corp → Elk Creek Surface Facilities; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Usx Corp → United States Steel Mining Company Inc; 1950-01-01 to 1985-12-29; source msha-controller-operator-history
- **operator_operates_mine:** Kaiser Coal Corp Of Somerset → Elk Creek Surface Facilities; 1985-12-30 to 1989-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Kaiser Steel Corp → Elk Creek Surface Facilities; 1985-12-30 to 1989-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Kaiser Steel Corp → Kaiser Coal Corp Of Somerset; 1985-12-30 to 1989-07-13; source msha-controller-operator-history
- **operator_operates_mine:** Somerset Mining Company → Elk Creek Surface Facilities; 1989-07-14 to 1995-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Oxbow Carbon LLC → Elk Creek Surface Facilities; 1989-07-14 to 1995-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Oxbow Carbon LLC → Somerset Mining Company; 1989-07-14 to 1995-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Oxbow Mining, LLC → Elk Creek Surface Facilities; 1995-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oxbow Carbon LLC → Elk Creek Surface Facilities; 1995-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oxbow Carbon LLC → Oxbow Mining, LLC; 1995-09-15 to current/open; source msha-controller-operator-history