# Relationship history for MSHA mine 1519107

Current hierarchy: **Blackhawk Mining LLC → Blackhawk Mining, LLC → Risner #1**

- 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:** Jim D  Akers et al → Risner #1; 1993-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl  Kirk et al → Risner #1; 1998-02-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** South Akers Mining Company, LLC → Risner #1; 2007-05-08 to 2008-04-27; source msha-controller-operator-history
- **controller_controls_operator:** Jim D  Akers et al → South Akers Mining Company, LLC; 2007-05-08 to 2008-04-27; source msha-controller-operator-history
- **controller_controls_operator:** Harold E  Akers et al → South Akers Mining Company, LLC; 2007-05-08 to 2008-04-27; source msha-controller-operator-history
- **operator_operates_mine:** North Star Mining Inc → Risner #1; 2008-04-28 to 2010-12-26; source msha-controller-operator-history
- **controller_controls_operator:** Carl  Kirk et al → North Star Mining Inc; 2008-04-28 to 2010-12-26; source msha-controller-operator-history
- **controller_controls_mine:** John M  Potter et al → Risner #1; 2010-07-16 to 2013-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Blackhawk Mining, LLC → Risner #1; 2010-12-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John M  Potter et al → Blackhawk Mining, LLC; 2010-12-27 to 2013-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Thomas A  Potter et al → Blackhawk Mining, LLC; 2010-12-27 to 2013-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Blackhawk Mining LLC → Risner #1; 2013-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blackhawk Mining LLC → Blackhawk Mining, LLC; 2013-07-01 to current/open; source msha-controller-operator-history