# Relationship history for MSHA mine 1517960

Current hierarchy: **Arch Resources Inc → ICG East Kentucky LLC → Blackberry Creek 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** John M  Potter et al → Blackberry Creek Mine; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sunny Ridge Mining Company Inc → Blackberry Creek Mine; 1997-07-01 to 1999-06-07; source msha-controller-operator-history
- **controller_controls_operator:** John M  Potter et al → Sunny Ridge Mining Company Inc; 1997-07-01 to 1999-06-07; source msha-controller-operator-history
- **controller_controls_operator:** Thomas A  Potter et al → Sunny Ridge Mining Company Inc; 1997-07-01 to 1999-06-07; source msha-controller-operator-history
- **operator_operates_mine:** Sunny Ridge Mining Co., Inc. → Blackberry Creek Mine; 1999-06-08 to 2004-10-26; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → Blackberry Creek Mine; 1999-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Sunny Ridge Mining Co., Inc.; 1999-06-08 to 2004-10-26; source msha-controller-operator-history
- **operator_operates_mine:** ICG East Kentucky LLC → Blackberry Creek Mine; 2004-10-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** International Coal Group Inc (ICG) → Blackberry Creek Mine; 2004-10-27 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_operator:** International Coal Group Inc (ICG) → ICG East Kentucky LLC; 2004-10-27 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Blackberry Creek Mine; 2011-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → ICG East Kentucky LLC; 2011-06-15 to current/open; source msha-controller-operator-history