# Relationship history for MSHA mine 1510415

Current hierarchy: **Cyprus Amax Minerals Company → Cyprus Cumberland Coal Corp → St Creek Job #3**

- 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:** Mountain Coals Inc → St Creek Job #3; 1975-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Straight Creek Mining Company → St Creek Job #3; 1977-05-01 to 1981-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Mountain Coals Inc → Straight Creek Mining Company; 1977-05-01 to 1981-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → St Creek Job #3; 1981-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cyprus Cumberland Coal Corp → St Creek Job #3; 1981-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Cyprus Cumberland Coal Corp; 1981-09-15 to current/open; source msha-controller-operator-history