# Relationship history for MSHA mine 3609201

Current hierarchy: **Michael T  McCullough → Black Hawk Mining Inc → 3130**

- 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:** Michael T  McCullough → 3130; 1994-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Hawk Mining Inc → 3130; 2004-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael T  McCullough → Black Hawk Mining Inc; 2004-01-26 to current/open; source msha-controller-operator-history