# Relationship history for MSHA mine 0900769

Current hierarchy: **Active Minerals Inc → Floridin Company → Mayfield 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:** Floridin Company → Mayfield Mine; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_mine:** ITT Corp → Mayfield Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** ITT Corp → Floridin Company; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Floridin Company → Mayfield Mine; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rio Tinto Group → Mayfield Mine; 1987-01-01 to 2005-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Rio Tinto Group → Floridin Company; 1987-01-01 to 2005-01-19; source msha-controller-operator-history
- **controller_controls_mine:** Active Minerals Inc → Mayfield Mine; 2005-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Active Minerals Inc → Floridin Company; 2005-01-20 to current/open; source msha-controller-operator-history