# Relationship history for MSHA mine 0502563

Current hierarchy: **Blue Rock Resources Ltd → Blue Rock Energy Corp → Tramp**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Russell D Neesham → Tramp; 1950-01-01 to 2007-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Russell D Neesham → Tramp; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Russell D Neesham → Russell D Neesham; 1950-01-01 to 2007-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Blue Rock Energy Corp → Tramp; 2007-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blue Rock Resources Ltd → Tramp; 2007-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blue Rock Resources Ltd → Blue Rock Energy Corp; 2007-11-19 to current/open; source msha-controller-operator-history