# Relationship history for MSHA mine 0202264

Current hierarchy: **BHP Billiton → BHP Copper → San Manuel Sx-Ew Plant**

- 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:** Newmont Corporation → San Manuel Sx-Ew Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bechtel Construction Inc → San Manuel Sx-Ew Plant; 1985-07-01 to 1986-07-31; source msha-controller-operator-history
- **controller_controls_mine:** A P  Yates → San Manuel Sx-Ew Plant; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A P  Yates → Bechtel Construction Inc; 1985-07-01 to 1986-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Magma Copper Company → San Manuel Sx-Ew Plant; 1986-08-01 to 1987-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Newmont Corporation → Magma Copper Company; 1986-08-01 to 1987-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Magma Copper Company → San Manuel Sx-Ew Plant; 1987-03-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Magma Copper Company → San Manuel Sx-Ew Plant; 1987-03-30 to 1996-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Magma Copper Company → Magma Copper Company; 1987-03-30 to 1996-02-21; source msha-controller-operator-history
- **operator_operates_mine:** BHP Copper → San Manuel Sx-Ew Plant; 1996-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Broken Hill Proprietary Company Ltd → San Manuel Sx-Ew Plant; 1996-02-22 to 2012-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Broken Hill Proprietary Company Ltd → BHP Copper; 1996-02-22 to 2012-08-22; source msha-controller-operator-history
- **controller_controls_mine:** BHP Billiton → San Manuel Sx-Ew Plant; 2012-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** BHP Billiton → BHP Copper; 2012-08-23 to current/open; source msha-controller-operator-history