# Relationship history for MSHA mine 4606818

Current hierarchy: **Arch Resources Inc → Patriot Mining Company Inc → Patriot Mining Company Inc**

- 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

- **operator_operates_mine:** Patriot Mining Company Inc → Patriot Mining Company Inc; 1984-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Anker Group Inc → Patriot Mining Company Inc; 1984-06-01 to 2005-11-17; source msha-controller-operator-history
- **controller_controls_operator:** Anker Group Inc → Patriot Mining Company Inc; 1984-06-01 to 2005-11-17; source msha-controller-operator-history
- **controller_controls_mine:** International Coal Group Inc (ICG) → Patriot Mining Company Inc; 2005-11-18 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_operator:** International Coal Group Inc (ICG) → Patriot Mining Company Inc; 2005-11-18 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Patriot Mining Company Inc; 2011-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Patriot Mining Company Inc; 2011-06-15 to current/open; source msha-controller-operator-history