# Relationship history for MSHA mine 3001710

Current hierarchy: **Leardi John → Empire Emery Mining Corp → Big John 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:** Ernest Bates → Big John Mine; 1950-01-01 to 1979-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Bates Ernest → Big John Mine; 1950-01-01 to 1979-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Bates Ernest → Ernest Bates; 1950-01-01 to 1979-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Gillan Frederick D → Big John Mine; 1950-01-01 to 1989-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Emeri-Crete Inc → Big John Mine; 1979-08-28 to 1984-04-01; source msha-controller-operator-history
- **controller_controls_operator:** Gillan Frederick D → Emeri-Crete Inc; 1979-08-28 to 1984-04-01; source msha-controller-operator-history
- **operator_operates_mine:** Empire Emery Mining Corp → Big John Mine; 1984-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Leardi John → Big John Mine; 1984-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leardi John → Empire Emery Mining Corp; 1984-04-02 to current/open; source msha-controller-operator-history