# Relationship history for MSHA mine 1512154

Current hierarchy: **William B  Sturgill → Big Elk Creek Coal Company Inc → No 5 Surface Mine**

- 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:** Paul J  Sturgill → No 5 Surface Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Golden Oak Mining Company Inc → No 5 Surface Mine; 1979-11-01 to 1980-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Paul J  Sturgill → Golden Oak Mining Company Inc; 1979-11-01 to 1980-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Golden Oak Mining Company Inc → No 5 Surface Mine; 1981-01-01 to 1988-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Reading & Bates Corp → No 5 Surface Mine; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reading & Bates Corp → Golden Oak Mining Company Inc; 1981-01-01 to 1988-03-22; source msha-controller-operator-history
- **controller_controls_mine:** William B  Sturgill → No 5 Surface Mine; 1987-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Elk Creek Coal Company Inc → No 5 Surface Mine; 1988-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William B  Sturgill → Big Elk Creek Coal Company Inc; 1988-03-23 to current/open; source msha-controller-operator-history