# Relationship history for MSHA mine 4200089

Current hierarchy: **Wolverine Fuels LLC → CANYON FUEL COMPANY LLC → SUFCO**

- 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:** Southern Utah Fuel Company → SUFCO; 1970-02-01 to 1997-02-05; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → SUFCO; 1970-02-01 to 1997-02-05; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Southern Utah Fuel Company; 1970-02-01 to 1997-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → SUFCO; 1996-12-20 to 2013-08-16; source msha-controller-operator-history
- **operator_operates_mine:** Canyon Fuel Company LLC → SUFCO; 1997-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Canyon Fuel Company LLC; 1997-02-06 to 2013-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Wolverine Fuels LLC → SUFCO; 2013-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wolverine Fuels LLC → Canyon Fuel Company LLC; 2013-08-17 to current/open; source msha-controller-operator-history