# Relationship history for MSHA mine 1513696

Current hierarchy: **Paul J  Sturgill → Big Elk Creek Coal Company Inc → No 1 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

- **operator_operates_mine:** Bledsoe Surface Mining Company Inc → No 1 Surface Mine; 1982-12-01 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Geo-Energy Ltd → No 1 Surface Mine; 1982-12-01 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Geo-Energy Ltd → Bledsoe Surface Mining Company Inc; 1982-12-01 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Paul J  Sturgill → No 1 Surface Mine; 1983-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Elk Creek Coal Company Inc → No 1 Surface Mine; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul J  Sturgill → Big Elk Creek Coal Company Inc; 1985-04-01 to current/open; source msha-controller-operator-history