# Relationship history for MSHA mine 1512684

Current hierarchy: **Russell Jerome E → Big Chase Mining Company Inc → No 1 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

- **controller_controls_mine:** White Ulys P & Edward V Cole → No 1 Mine; 1979-06-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thacker Energy Corp → No 1 Mine; 1981-01-01 to 1985-07-31; source msha-controller-operator-history
- **controller_controls_operator:** White Ulys P & Edward V Cole → Thacker Energy Corp; 1981-01-01 to 1985-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Big Chase Mining Company Inc → No 1 Mine; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Russell Jerome E → No 1 Mine; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Russell Jerome E → Big Chase Mining Company Inc; 1985-08-01 to current/open; source msha-controller-operator-history