# Relationship history for MSHA mine 0200826

Current hierarchy: **Grupo Mexico S A B de C V → Asarco LLC → Hayden Concentrator**

- 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:** Asarco Inc → Hayden Concentrator; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kennecott Minerals Company → Hayden Concentrator; 1950-01-01 to 1981-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Kennecott Copper Corp → Hayden Concentrator; 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 → Hayden Concentrator; 1980-10-16 to 1986-11-17; source msha-controller-operator-history
- **operator_operates_mine:** Kennecott Ray Mines Division → Hayden Concentrator; 1981-06-04 to 1986-11-17; source msha-controller-operator-history
- **controller_controls_operator:** British Petroleum Company PLC → Kennecott Ray Mines Division; 1981-06-04 to 1986-11-17; source msha-controller-operator-history
- **operator_operates_mine:** Asarco Inc → Hayden Concentrator; 1986-11-18 to 2003-03-24; source msha-controller-operator-history
- **controller_controls_operator:** Asarco Inc → Asarco Inc; 1986-11-18 to 2003-03-24; source msha-controller-operator-history
- **controller_controls_mine:** Grupo Mexico S A B de C V → Hayden Concentrator; 1999-11-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Asarco LLC → Hayden Concentrator; 2003-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grupo Mexico S A B de C V → Asarco LLC; 2003-03-25 to current/open; source msha-controller-operator-history