# Relationship history for MSHA mine 1800709

Current hierarchy: **Arch Resources Inc → Vindex Energy LLC → Frostburg Blend Yard**

- 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 → Frostburg Blend Yard; 1984-06-01 to 2005-11-17; source msha-controller-operator-history
- **operator_operates_mine:** Black Diamond Energies → Frostburg Blend Yard; 1984-10-01 to 1990-10-11; source msha-controller-operator-history
- **controller_controls_mine:** Fay E  Leydig → Frostburg Blend Yard; 1984-10-01 to 1990-10-11; source msha-controller-operator-history
- **controller_controls_operator:** Fay E  Leydig → Black Diamond Energies; 1984-10-01 to 1990-10-11; source msha-controller-operator-history
- **operator_operates_mine:** Patriot Mining Company Inc → Frostburg Blend Yard; 1990-10-12 to 2007-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Anker Group Inc → Patriot Mining Company Inc; 1990-10-12 to 2005-11-17; source msha-controller-operator-history
- **controller_controls_mine:** Anker Group Inc → Frostburg Blend Yard; 1997-02-10 to 2005-11-17; source msha-controller-operator-history
- **controller_controls_mine:** International Coal Group Inc (ICG) → Frostburg Blend Yard; 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 2007-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Vindex Energy LLC → Frostburg Blend Yard; 2007-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** International Coal Group Inc (ICG) → Vindex Energy LLC; 2007-07-17 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Anker Group Inc → Vindex Energy LLC; 2007-07-17 to 2005-11-17; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Frostburg Blend Yard; 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 2007-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Vindex Energy LLC; 2011-06-15 to current/open; source msha-controller-operator-history