# Relationship history for MSHA mine 2901637

Current hierarchy: **Douglas E  Hanson → Royal Minerals Inc → NEW LOST SUMMIT #1 BANKS**

- 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

- **operator_operates_mine:** Summit Minerals Inc → NEW LOST SUMMIT #1 BANKS; 1950-01-01 to 1983-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Douglas E  Hanson → NEW LOST SUMMIT #1 BANKS; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas E  Hanson → Summit Minerals Inc; 1950-01-01 to 1983-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Douglas E  Hanson → NEW LOST SUMMIT #1 BANKS; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Inspiration Mines Inc → NEW LOST SUMMIT #1 BANKS; 1983-06-01 to 1987-09-13; source msha-controller-operator-history
- **controller_controls_mine:** Inspiration Resources Corp & Summit Minerals Inc → NEW LOST SUMMIT #1 BANKS; 1983-06-01 to 1987-09-13; source msha-controller-operator-history
- **controller_controls_operator:** Inspiration Resources Corp & Summit Minerals Inc → Inspiration Mines Inc; 1983-06-01 to 1987-09-13; source msha-controller-operator-history
- **operator_operates_mine:** Royal Minerals Inc → NEW LOST SUMMIT #1 BANKS; 1987-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas E  Hanson → Royal Minerals Inc; 1987-09-14 to current/open; source msha-controller-operator-history