# Relationship history for MSHA mine 2300458

Current hierarchy: **Renco Group Inc → Doe Run Company → Sweetwater Mine/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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Asarco Inc → Sweetwater Mine/Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ozark Lead Company → Sweetwater Mine/Mill; 1950-01-01 to 1981-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Kennecott Copper Corp → Sweetwater Mine/Mill; 1950-01-01 to 1981-03-25; source msha-controller-operator-history
- **controller_controls_operator:** Kennecott Copper Corp → Ozark Lead Company; 1950-01-01 to 1981-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Ozark Lead Company → Sweetwater Mine/Mill; 1981-03-26 to 1987-01-05; source msha-controller-operator-history
- **controller_controls_mine:** British Petroleum Company PLC → Sweetwater Mine/Mill; 1981-03-26 to 1987-01-05; source msha-controller-operator-history
- **controller_controls_operator:** British Petroleum Company PLC → Ozark Lead Company; 1981-03-26 to 1987-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Asarco Inc → Sweetwater Mine/Mill; 1987-01-06 to 1998-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Asarco Inc → Asarco Inc; 1987-01-06 to 1998-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Renco Group Inc → Sweetwater Mine/Mill; 1994-04-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Doe Run Company → Sweetwater Mine/Mill; 1998-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Renco Group Inc → Doe Run Company; 1998-09-01 to current/open; source msha-controller-operator-history