# Relationship history for MSHA mine 2601543

Current hierarchy: **Davidson Jospeh & James Denholm → Flying J Mines → Florida Canyon Mine And Mill**

- 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

- **operator_operates_mine:** Ore-Nugget Limited → Florida Canyon Mine And Mill; 1979-01-01 to 1979-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Toporowski Robert-Jim Beres Et Al → Florida Canyon Mine And Mill; 1979-01-01 to 1979-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Toporowski Robert-Jim Beres Et Al → Ore-Nugget Limited; 1979-01-01 to 1979-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Flying J Mines → Florida Canyon Mine And Mill; 1979-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davidson Jospeh & James Denholm → Florida Canyon Mine And Mill; 1979-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davidson Jospeh & James Denholm → Flying J Mines; 1979-10-16 to current/open; source msha-controller-operator-history