# Relationship history for MSHA mine 4200148

Current hierarchy: **Chief Consolidated & Korea Zinc → Tintic Utah Metals Llc → Burgin/Apex**

- 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

- **controller_controls_mine:** Sunshine Mining & Refining Company → Burgin/Apex; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kennecott Minerals Company → Burgin/Apex; 1950-01-01 to 1981-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Kennecott Copper Corp → Burgin/Apex; 1950-01-01 to 1981-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Kennecott Copper Corp → Kennecott Minerals Company; 1950-01-01 to 1981-06-03; source msha-controller-operator-history
- **controller_controls_mine:** British Petroleum Company PLC → Burgin/Apex; 1981-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kennecott Minerals Company → Burgin/Apex; 1981-06-04 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_operator:** British Petroleum Company PLC → Kennecott Minerals Company; 1981-06-04 to 1985-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Sunshine Mining Company → Burgin/Apex; 1985-04-01 to 1992-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Sunshine Mining & Refining Company → Sunshine Mining Company; 1985-04-01 to 1992-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Chief Consolidated Mining Company → Burgin/Apex; 1993-01-01 to 1996-08-21; source msha-controller-operator-history
- **controller_controls_mine:** Chief Consolidated Mining Company → Burgin/Apex; 1993-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chief Consolidated Mining Company → Chief Consolidated Mining Company; 1993-01-01 to 1996-08-21; source msha-controller-operator-history
- **operator_operates_mine:** Tintic Utah Metals Llc → Burgin/Apex; 1996-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chief Consolidated & Korea Zinc → Burgin/Apex; 1996-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chief Consolidated & Korea Zinc → Tintic Utah Metals Llc; 1996-08-22 to current/open; source msha-controller-operator-history