# Relationship history for MSHA mine 4201517

Current hierarchy: **Cyprus Amax Minerals Company → Castle Gate Holding Company → Castle Gate Prep Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Mc Culloch Oil Corp → Castle Gate Prep Plant; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Braztah Corp → Castle Gate Prep Plant; 1978-11-01 to 1979-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Mc Culloch Oil Corp → Braztah Corp; 1978-11-01 to 1979-12-14; source msha-controller-operator-history
- **controller_controls_mine:** American Electric Power Company Inc → Castle Gate Prep Plant; 1979-12-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Price River Coal Company → Castle Gate Prep Plant; 1979-12-15 to 1986-05-29; source msha-controller-operator-history
- **controller_controls_operator:** American Electric Power Company Inc → Price River Coal Company; 1979-12-15 to 1986-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Castle Gate Holding Company → Castle Gate Prep Plant; 1986-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Castle Gate Prep Plant; 1986-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Castle Gate Holding Company; 1986-05-30 to current/open; source msha-controller-operator-history