# Relationship history for MSHA mine 0102709

Current hierarchy: **Costain Group PLC → B & G Mining Company Inc → West Blocton Test Pit**

- 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:** B & G Mining Company Inc → West Blocton Test Pit; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Costain Group PLC → West Blocton Test Pit; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Costain Group PLC → B & G Mining Company Inc; 1987-01-01 to current/open; source msha-controller-operator-history