# Relationship history for MSHA mine 1509960

Current hierarchy: **Basic American Industries → Mullin Creek Coal Company Inc → No 1 (D)**

- 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

- **operator_operates_mine:** Green Valley Coal Company Inc → No 1 (D); 1976-09-01 to 1978-12-11; source msha-controller-operator-history
- **controller_controls_mine:** John P  Church → No 1 (D); 1976-09-01 to 1978-12-11; source msha-controller-operator-history
- **controller_controls_operator:** John P  Church → Green Valley Coal Company Inc; 1976-09-01 to 1978-12-11; source msha-controller-operator-history
- **operator_operates_mine:** Green Valley Coal Company Inc → No 1 (D); 1978-12-12 to 1979-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Basic American Industries → No 1 (D); 1978-12-12 to 1979-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Basic American Industries → Green Valley Coal Company Inc; 1978-12-12 to 1979-10-08; source msha-controller-operator-history
- **operator_operates_mine:** Mullin Creek Coal Company Inc → No 1 (D); 1979-10-09 to 1980-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Stanley Kenneth D → No 1 (D); 1979-10-09 to 1980-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Stanley Kenneth D → Mullin Creek Coal Company Inc; 1979-10-09 to 1980-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Mullin Creek Coal Company Inc → No 1 (D); 1980-06-24 to 1981-02-18; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Terry → No 1 (D); 1980-06-24 to 1981-02-18; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Terry → Mullin Creek Coal Company Inc; 1980-06-24 to 1981-02-18; source msha-controller-operator-history
- **operator_operates_mine:** Mullin Creek Coal Company Inc → No 1 (D); 1981-02-19 to 1983-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Basic American Industries → No 1 (D); 1981-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Basic American Industries → Mullin Creek Coal Company Inc; 1981-02-19 to 1983-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Mount Calvery Coal Company Inc → No 1 (D); 1983-02-16 to 1984-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Varney Emery & Glenn → No 1 (D); 1983-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Varney Emery & Glenn → Mount Calvery Coal Company Inc; 1983-02-16 to 1984-11-29; source msha-controller-operator-history
- **operator_operates_mine:** Mullin Creek Coal Company Inc → No 1 (D); 1984-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Basic American Industries → Mullin Creek Coal Company Inc; 1984-11-30 to current/open; source msha-controller-operator-history