# Relationship history for MSHA mine 4608691

Current hierarchy: **Norman B  Mullins → Black Diamond Enterprises Inc → Algoma Refuse Recovery**

- 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:** Flat Ridge Corp → Algoma Refuse Recovery; 1998-01-01 to 2003-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Brent M  Cook → Algoma Refuse Recovery; 1998-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent M  Cook → Flat Ridge Corp; 1998-01-01 to 2003-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Black Diamond Enterprises Inc → Algoma Refuse Recovery; 2003-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Norman B  Mullins → Algoma Refuse Recovery; 2003-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Norman B  Mullins → Black Diamond Enterprises Inc; 2003-11-15 to current/open; source msha-controller-operator-history