# Relationship history for MSHA mine 2602077

Current hierarchy: **Barrick Gold Corp → Barrick Bullfrog Inc → BULLFROG MINE & MILL**

- 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:** Lac Bullfrog Inc → BULLFROG MINE & MILL; 1988-08-01 to 1995-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Lac Minerals Ltd → BULLFROG MINE & MILL; 1988-08-01 to 1995-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Lac Minerals Ltd → Lac Bullfrog Inc; 1988-08-01 to 1995-04-17; source msha-controller-operator-history
- **operator_operates_mine:** Barrick Bullfrog Inc → BULLFROG MINE & MILL; 1995-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barrick Gold Corp → BULLFROG MINE & MILL; 1995-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barrick Gold Corp → Barrick Bullfrog Inc; 1995-04-18 to current/open; source msha-controller-operator-history