# Relationship history for MSHA mine 1515424

Current hierarchy: **Canada Donnie → River Hurricane Coal Company Inc → No 6**

- 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:** United  Company → No 6; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Canada Donnie → No 6; 1978-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Star Coal Corp → No 6; 1985-10-01 to 1987-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Stiltner Denver → No 6; 1985-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stiltner Denver → Blue Star Coal Corp; 1985-10-01 to 1987-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → No 6; 1987-02-11 to 1987-03-12; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1987-02-11 to 1987-03-12; source msha-controller-operator-history
- **operator_operates_mine:** River Hurricane Coal Company Inc → No 6; 1987-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Canada Donnie → River Hurricane Coal Company Inc; 1987-03-13 to current/open; source msha-controller-operator-history