# Relationship history for MSHA mine 2601675

Current hierarchy: **B M R Gold Corp → Oliver Hills Mining Company Inc → Oliver Hills Leach Facility**

- 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:** Comstock Gold Exploration Ventures → Oliver Hills Leach Facility; 1980-09-01 to 1982-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Intermountain Exploration Company → Oliver Hills Leach Facility; 1980-09-01 to 1982-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Intermountain Exploration Company → Comstock Gold Exploration Ventures; 1980-09-01 to 1982-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Miss Quickly Mines Inc → Oliver Hills Leach Facility; 1982-10-15 to 1984-04-05; source msha-controller-operator-history
- **controller_controls_mine:** Frontier Mining & Oil Corp → Oliver Hills Leach Facility; 1982-10-15 to 1984-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Frontier Mining & Oil Corp → Miss Quickly Mines Inc; 1982-10-15 to 1984-04-05; source msha-controller-operator-history
- **operator_operates_mine:** Nevex Gold Company Inc → Oliver Hills Leach Facility; 1984-04-06 to 1988-01-10; source msha-controller-operator-history
- **controller_controls_mine:** Parks William C → Oliver Hills Leach Facility; 1984-04-06 to 1988-01-10; source msha-controller-operator-history
- **controller_controls_operator:** Parks William C → Nevex Gold Company Inc; 1984-04-06 to 1988-01-10; source msha-controller-operator-history
- **operator_operates_mine:** Canyon Resources Corp → Oliver Hills Leach Facility; 1988-01-11 to 1989-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Canyon Resources Corp → Oliver Hills Leach Facility; 1988-01-11 to 1989-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Canyon Resources Corp → Canyon Resources Corp; 1988-01-11 to 1989-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Oliver Hills Mining Company Inc → Oliver Hills Leach Facility; 1989-04-01 to 1991-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Jolcover Scott → Oliver Hills Leach Facility; 1989-04-01 to 1993-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Jolcover Scott → Oliver Hills Mining Company Inc; 1989-04-01 to 1991-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Oliver Hills Mining Company Inc → Oliver Hills Leach Facility; 1991-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** B M R Gold Corp → Oliver Hills Leach Facility; 1991-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B M R Gold Corp → Oliver Hills Mining Company Inc; 1991-07-01 to current/open; source msha-controller-operator-history