# Relationship history for MSHA mine 1514279

Current hierarchy: **Costain Group PLC → Wolverine Mining Corp → #2 Surface**

- 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:** Costain Group PLC → #2 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wolverine Mining Corp → #2 Surface; 1983-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Costain Group PLC → Wolverine Mining Corp; 1983-10-01 to current/open; source msha-controller-operator-history