# Relationship history for MSHA mine 4608777

Current hierarchy: **Core Natural Resources Inc → Wolf Run Mining LLC → Leer South Preparation Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Anker Group Inc → Leer South Preparation Plant; 1990-07-17 to 2005-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Wolf Run Mining LLC → Leer South Preparation Plant; 1999-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anker Group Inc → Wolf Run Mining LLC; 1999-05-01 to 2005-05-31; source msha-controller-operator-history
- **controller_controls_mine:** International Coal Group Inc (ICG) → Leer South Preparation Plant; 2005-06-01 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_operator:** International Coal Group Inc (ICG) → Wolf Run Mining LLC; 2005-06-01 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Leer South Preparation Plant; 2011-06-15 to 2025-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Wolf Run Mining LLC; 2011-06-15 to 2025-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Core Natural Resources Inc → Leer South Preparation Plant; 2025-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Core Natural Resources Inc → Wolf Run Mining LLC; 2025-01-14 to current/open; source msha-controller-operator-history