# Relationship history for MSHA mine 0503505

Current hierarchy: **Deseret Generation & Transmission Co-operative → Blue Mountain Energy Inc → Deserado 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:** Western Fuels-Utah Inc → Deserado Mine; 1979-12-01 to 1996-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Western Fuels Association Inc → Deserado Mine; 1979-12-01 to 1996-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Western Fuels Association Inc → Western Fuels-Utah Inc; 1979-12-01 to 1996-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Blue Mountain Energy Inc → Deserado Mine; 1996-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Deseret Generation & Transmission Co-operative → Deserado Mine; 1996-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deseret Generation & Transmission Co-operative → Blue Mountain Energy Inc; 1996-10-16 to current/open; source msha-controller-operator-history