# Relationship history for MSHA mine 4608791

Current hierarchy: **Core Natural Resources Inc → Wolf Run Mining Company → Sago 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:** Anker Group Inc → Sago Mine; 1990-07-17 to 2005-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Bruce W  Sigler → Sago Mine; 1993-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bjm Coal Company → Sago Mine; 1999-08-01 to 2002-01-10; source msha-controller-operator-history
- **controller_controls_operator:** Bruce W  Sigler → Bjm Coal Company; 1999-08-01 to 2002-01-10; source msha-controller-operator-history
- **operator_operates_mine:** Wolf Run Mining Company → Sago Mine; 2002-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anker Group Inc → Wolf Run Mining Company; 2002-01-11 to 2005-05-31; source msha-controller-operator-history
- **controller_controls_mine:** International Coal Group Inc (ICG) → Sago Mine; 2005-06-01 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_operator:** International Coal Group Inc (ICG) → Wolf Run Mining Company; 2005-06-01 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Sago Mine; 2011-06-15 to 2025-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Wolf Run Mining Company; 2011-06-15 to 2025-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Core Natural Resources Inc → Sago Mine; 2025-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Core Natural Resources Inc → Wolf Run Mining Company; 2025-01-14 to current/open; source msha-controller-operator-history