# Relationship history for MSHA mine 0503455

Current hierarchy: **Energy Fuels Coal Resources Ltd → Energy Fuels Coal Inc → Southfield 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:** Damson Oil Corp → Southfield Mine; 1978-07-01 to 1987-02-06; source msha-controller-operator-history
- **operator_operates_mine:** Dorchester Coal Company → Southfield Mine; 1979-08-01 to 1985-03-21; source msha-controller-operator-history
- **controller_controls_operator:** Damson Oil Corp → Dorchester Coal Company; 1979-08-01 to 1985-03-21; source msha-controller-operator-history
- **operator_operates_mine:** Energy Fuels Coal Inc → Southfield Mine; 1985-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Energy Fuels Coal Resources Ltd → Southfield Mine; 1985-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Energy Fuels Coal Resources Ltd → Energy Fuels Coal Inc; 1985-03-22 to current/open; source msha-controller-operator-history