# Relationship history for MSHA mine 2601989

Current hierarchy: **Robert F Flaherty → Phoenix Metals Usa Ii Inc → BLACK MOUNTAIN REFINERY**

- 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

- **controller_controls_mine:** T D  Barnes → BLACK MOUNTAIN REFINERY; 1985-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Geneva Minerals Inc → BLACK MOUNTAIN REFINERY; 1986-11-01 to 1998-04-20; source msha-controller-operator-history
- **controller_controls_operator:** T D  Barnes → Geneva Minerals Inc; 1986-11-01 to 1998-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Phoenix Metals Usa Ii Inc → BLACK MOUNTAIN REFINERY; 1998-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert F Flaherty → BLACK MOUNTAIN REFINERY; 1998-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert F Flaherty → Phoenix Metals Usa Ii Inc; 1998-04-21 to current/open; source msha-controller-operator-history