# Relationship history for MSHA mine 0404626

Current hierarchy: **CMC Metals Ltd → 0877887 BC LTD → Bishop 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

- **controller_controls_mine:** Mc Coy Dave → Bishop Mill; 1981-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mammoth Lakes Mining Corp → Bishop Mill; 1983-02-01 to 2015-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Mc Coy Dave → Mammoth Lakes Mining Corp; 1983-02-01 to 2015-03-31; source msha-controller-operator-history
- **operator_operates_mine:** 0877887 BC LTD → Bishop Mill; 2015-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CMC Metals Ltd → Bishop Mill; 2015-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CMC Metals Ltd → 0877887 BC LTD; 2015-04-01 to current/open; source msha-controller-operator-history