# Relationship history for MSHA mine 4200077

Current hierarchy: **Wolverine Fuels LLC → Canyon Fuel Company Llc → Soldier Canyon**

- 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:** Premium Coal Company → Soldier Canyon; 1950-01-01 to 1974-12-10; source msha-controller-operator-history
- **controller_controls_mine:** Mariononi John A → Soldier Canyon; 1950-01-01 to 1974-12-10; source msha-controller-operator-history
- **controller_controls_operator:** Mariononi John A → Premium Coal Company; 1950-01-01 to 1974-12-10; source msha-controller-operator-history
- **operator_operates_mine:** Soldier Creek Coal Company → Soldier Canyon; 1974-12-11 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Calmat Company → Soldier Canyon; 1974-12-11 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Calmat Company → Soldier Creek Coal Company; 1974-12-11 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Soldier Creek Coal Company → Soldier Canyon; 1987-01-01 to 1993-09-15; source msha-controller-operator-history
- **controller_controls_mine:** Sunoco, Inc. → Soldier Canyon; 1987-01-01 to 1993-09-15; source msha-controller-operator-history
- **controller_controls_operator:** Sunoco, Inc. → Soldier Creek Coal Company; 1987-01-01 to 1993-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Soldier Creek Coal Company → Soldier Canyon; 1993-09-16 to 1996-12-19; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → Soldier Canyon; 1993-09-16 to 1998-05-31; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Soldier Creek Coal Company; 1993-09-16 to 1996-12-19; source msha-controller-operator-history
- **operator_operates_mine:** Canyon Fuel Company Llc → Soldier Canyon; 1996-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Soldier Canyon; 1996-12-20 to 2013-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Canyon Fuel Company Llc; 1996-12-20 to 2013-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Wolverine Fuels LLC → Soldier Canyon; 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