# Relationship history for MSHA mine 2300457

Current hierarchy: **Renco Group Inc → Doe Run Company → Buick 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:** Fluor Corp → Buick Mine/Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Amax Lead Company Of Missouri → Buick Mine/Mill; 1950-01-01 to 1986-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Amax Inc et al → Buick Mine/Mill; 1950-01-01 to 1986-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Amax Inc et al → Amax Lead Company Of Missouri; 1950-01-01 to 1986-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Homestake Lead Company Of Missouri → Buick Mine/Mill; 1986-06-01 to 1986-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Homestake Mining Company → Buick Mine/Mill; 1986-06-01 to 1986-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Homestake Mining Company → Homestake Lead Company Of Missouri; 1986-06-01 to 1986-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Doe Run Company → Buick Mine/Mill; 1986-11-01 to 1994-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Fluor Corp → Doe Run Company; 1986-11-01 to 1994-04-03; source msha-controller-operator-history
- **operator_operates_mine:** Doe Run Company → Buick Mine/Mill; 1994-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Renco Group Inc → Buick Mine/Mill; 1994-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Renco Group Inc → Doe Run Company; 1994-04-04 to current/open; source msha-controller-operator-history