# Relationship history for MSHA mine 2600731

Current hierarchy: **Canyon Resources Corp → Cr Minerals Corp → Brady Pit**

- 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:** Cyprus Diatomite Company → Brady Pit; 1950-01-01 to 1980-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Mines Corp → Brady Pit; 1950-01-01 to 1980-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Mines Corp → Cyprus Diatomite Company; 1950-01-01 to 1980-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Cyprus Diatomite Company → Brady Pit; 1980-09-22 to 1987-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Brady Pit; 1980-09-22 to 1987-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Cyprus Diatomite Company; 1980-09-22 to 1987-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Cr Minerals Corp → Brady Pit; 1987-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Canyon Resources Corp → Brady Pit; 1987-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Canyon Resources Corp → Cr Minerals Corp; 1987-11-09 to current/open; source msha-controller-operator-history