# Relationship history for MSHA mine 2601343

Current hierarchy: **Universal Explorations Ltd → Universal Gas (Montana) Inc → Bullion Monarch 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Polar Resources Company → Bullion Monarch Mine; 1950-01-01 to 1979-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Hunt Warren C → Bullion Monarch Mine; 1950-01-01 to 1979-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Hunt Warren C → Polar Resources Company; 1950-01-01 to 1979-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Universal Gas (Montana) Inc → Bullion Monarch Mine; 1979-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Universal Explorations Ltd → Bullion Monarch Mine; 1979-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Universal Explorations Ltd → Universal Gas (Montana) Inc; 1979-06-15 to current/open; source msha-controller-operator-history