# Relationship history for MSHA mine 1000083

Current hierarchy: **Bunker Hill Mining Corp → Silver Valley Metals Corp. → BUNKER HILL 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:** Bunker Hill Company → BUNKER HILL MINE; 1950-01-01 to 1982-11-21; source msha-controller-operator-history
- **controller_controls_mine:** Gulf USA Corp → BUNKER HILL MINE; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gulf USA Corp → Bunker Hill Company; 1950-01-01 to 1982-11-21; source msha-controller-operator-history
- **operator_operates_mine:** Bunker Limited Partnership → BUNKER HILL MINE; 1982-11-22 to 1986-06-01; source msha-controller-operator-history
- **controller_controls_mine:** BH Properties Inc  et al → BUNKER HILL MINE; 1982-11-22 to 1986-06-01; source msha-controller-operator-history
- **controller_controls_operator:** BH Properties Inc  et al → Bunker Limited Partnership; 1982-11-22 to 1986-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Bunker Hill Mining Company (Us) Inc → BUNKER HILL MINE; 1986-06-02 to 1992-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Bunker Hill Mining Company Inc → BUNKER HILL MINE; 1986-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bunker Hill Mining Company Inc → Bunker Hill Mining Company (Us) Inc; 1986-06-02 to 1992-08-26; source msha-controller-operator-history
- **operator_operates_mine:** Placer Mining Corporation → BUNKER HILL MINE; 1992-08-27 to 2022-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Hopper → BUNKER HILL MINE; 1992-08-27 to 2014-03-23; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Hopper → Placer Mining Corporation; 1992-08-27 to 2014-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Hopper Jr → BUNKER HILL MINE; 2014-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Hopper Jr → Placer Mining Corporation; 2014-03-24 to 2022-02-17; source msha-controller-operator-history
- **operator_operates_mine:** Silver Valley Metals Corp. → BUNKER HILL MINE; 2022-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bunker Hill Mining Corp → BUNKER HILL MINE; 2022-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bunker Hill Mining Corp → Silver Valley Metals Corp.; 2022-02-18 to current/open; source msha-controller-operator-history