# Relationship history for MSHA mine 0200017

Current hierarchy: **Magma Copper Company → Magma Copper Company → Camp Grant Open Pit**

- 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:** Andrew J  Gilbert III → Camp Grant Open Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gordon Wainwright-Contractor → Camp Grant Open Pit; 1950-01-01 to 1979-10-29; source msha-controller-operator-history
- **controller_controls_mine:** Wainwright Gordon → Camp Grant Open Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wainwright Gordon → Gordon Wainwright-Contractor; 1950-01-01 to 1979-10-29; source msha-controller-operator-history
- **operator_operates_mine:** A J Gilbert Construction Company → Camp Grant Open Pit; 1979-10-30 to 1989-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Andrew J  Gilbert III → A J Gilbert Construction Company; 1979-10-30 to 1989-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Magma Copper Company → Camp Grant Open Pit; 1987-03-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Magma Copper Company → Camp Grant Open Pit; 1989-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Magma Copper Company → Magma Copper Company; 1989-08-04 to current/open; source msha-controller-operator-history