# Relationship history for MSHA mine 0503599

Current hierarchy: **Horvath George A → Nederland Mines Inc → Caribou 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:** Hendricks Minerals → Caribou Mine; 1950-01-01 to 1984-04-24; source msha-controller-operator-history
- **operator_operates_mine:** Hendricks-Good Milling Company → Caribou Mine; 1980-10-01 to 1983-09-27; source msha-controller-operator-history
- **controller_controls_operator:** Hendricks Minerals → Hendricks-Good Milling Company; 1980-10-01 to 1983-09-27; source msha-controller-operator-history
- **operator_operates_mine:** North American Power Petroleums → Caribou Mine; 1983-09-28 to 1985-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Mc Cleery John B → Caribou Mine; 1983-09-28 to 1985-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Mc Cleery John B → North American Power Petroleums; 1983-09-28 to 1985-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Nederland Mines Inc → Caribou Mine; 1985-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Horvath George A → Caribou Mine; 1985-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horvath George A → Nederland Mines Inc; 1985-05-08 to current/open; source msha-controller-operator-history