# Relationship history for MSHA mine 5001309

Current hierarchy: **Enserch Corp → Enserch Exploration Inc → Independence Mine**

- 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:** Coronado Mining Corp → Independence Mine; 1980-02-01 to 1983-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Hawley Resource Group Inc → Independence Mine; 1980-02-01 to 1983-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Hawley Resource Group Inc → Coronado Mining Corp; 1980-02-01 to 1983-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Enserch Corp → Independence Mine; 1982-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Enserch Exploration Inc → Independence Mine; 1983-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Enserch Corp → Enserch Exploration Inc; 1983-02-28 to current/open; source msha-controller-operator-history