# Relationship history for MSHA mine 2902082

Current hierarchy: **Gardner B J → Grande River Mines Inc → Henry Blue Moon 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:** Grande River Mines Inc → Henry Blue Moon Mine; 1992-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gardner B J → Henry Blue Moon Mine; 1992-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gardner B J → Grande River Mines Inc; 1992-03-01 to current/open; source msha-controller-operator-history