# Relationship history for MSHA mine 1504314

Current hierarchy: **Cyprus Amax Minerals Company → Straight Creek Mining Company → #1 Strip**

- 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:** Laurel Mining Company Inc → #1 Strip; 1950-01-01 to 1975-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Laird T  Orr Jr. → #1 Strip; 1950-01-01 to 1975-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Laird T  Orr Jr. → Laurel Mining Company Inc; 1950-01-01 to 1975-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Straight Creek Mining Company → #1 Strip; 1975-07-01 to 1981-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Mountain Coals Inc → #1 Strip; 1975-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mountain Coals Inc → Straight Creek Mining Company; 1975-07-01 to 1981-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Straight Creek Mining Company → #1 Strip; 1981-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → #1 Strip; 1981-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Straight Creek Mining Company; 1981-09-15 to current/open; source msha-controller-operator-history