# Relationship history for MSHA mine 4502358

Current hierarchy: **Black Leonard → High Country Mining → Valley 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

- **operator_operates_mine:** Ruby Mines Inc → Valley Mine; 1950-01-01 to 1983-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Wolley La Mar → Valley Mine; 1950-01-01 to 1983-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Wolley La Mar → Ruby Mines Inc; 1950-01-01 to 1983-10-31; source msha-controller-operator-history
- **operator_operates_mine:** High Country Mining → Valley Mine; 1983-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Black Leonard → Valley Mine; 1983-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Black Leonard → High Country Mining; 1983-11-01 to current/open; source msha-controller-operator-history