# Relationship history for MSHA mine 2601624

Current hierarchy: **Placer Dome Ltd → Placer Dome U S Inc → Alligator Ridge 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:** Placer Dome Ltd → Alligator Ridge Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bp Gold Company → Alligator Ridge Mine; 1980-03-01 to 1989-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Bp Minerals America & Nerco Minerals Co → Alligator Ridge Mine; 1980-03-01 to 1989-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Bp Minerals America & Nerco Minerals Co → Bp Gold Company; 1980-03-01 to 1989-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Pegasus Gold Inc Et Al → Alligator Ridge Mine; 1988-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kennecott Alligator Ridge Company → Alligator Ridge Mine; 1989-06-30 to 1990-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Rio Tinto Group → Alligator Ridge Mine; 1989-06-30 to 1990-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Rio Tinto Group → Kennecott Alligator Ridge Company; 1989-06-30 to 1990-05-30; source msha-controller-operator-history
- **operator_operates_mine:** Usmx Inc → Alligator Ridge Mine; 1990-05-31 to 1993-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Pegasus Gold Inc Et Al → Usmx Inc; 1990-05-31 to 1993-12-06; source msha-controller-operator-history
- **operator_operates_mine:** Placer Dome U S Inc → Alligator Ridge Mine; 1993-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Placer Dome Ltd → Placer Dome U S Inc; 1993-12-07 to current/open; source msha-controller-operator-history