# Relationship history for MSHA mine 1518998

Current hierarchy: **Blackhawk Mining LLC → Spurlock Mining LLC → Spurlock #2 Surface 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Edsel H  Preece et al → Spurlock #2 Surface Mine; 2005-01-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Zag Resources Inc → Spurlock #2 Surface Mine; 2006-05-16 to 2007-02-18; source msha-controller-operator-history
- **controller_controls_mine:** Jonathan  McKenzie → Spurlock #2 Surface Mine; 2006-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jonathan  McKenzie → Zag Resources Inc; 2006-05-16 to 2007-02-18; source msha-controller-operator-history
- **controller_controls_mine:** David  Ison  et al → Spurlock #2 Surface Mine; 2006-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Twin Energy L.L.C. → Spurlock #2 Surface Mine; 2007-02-19 to 2008-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Edsel H  Preece et al → Twin Energy L.L.C.; 2007-02-19 to 2008-03-11; source msha-controller-operator-history
- **operator_operates_mine:** American Contracting Group LLC → Spurlock #2 Surface Mine; 2008-03-12 to 2011-04-12; source msha-controller-operator-history
- **controller_controls_operator:** David  Ison  et al → American Contracting Group LLC; 2008-03-12 to 2011-04-12; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Horton  et al → American Contracting Group LLC; 2008-03-12 to 2011-04-12; source msha-controller-operator-history
- **controller_controls_mine:** John M  Potter et al → Spurlock #2 Surface Mine; 2010-07-16 to 2013-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Blackhawk Mining LLC → Spurlock #2 Surface Mine; 2011-04-13 to 2015-06-30; source msha-controller-operator-history
- **controller_controls_operator:** John M  Potter et al → Blackhawk Mining LLC; 2011-04-13 to 2013-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Thomas A  Potter et al → Blackhawk Mining LLC; 2011-04-13 to 2013-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Blackhawk Mining LLC → Spurlock #2 Surface Mine; 2013-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blackhawk Mining LLC → Blackhawk Mining LLC; 2013-07-01 to 2015-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Spurlock Mining LLC → Spurlock #2 Surface Mine; 2015-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blackhawk Mining LLC → Spurlock #2 Surface Mine; 2015-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blackhawk Mining LLC → Spurlock Mining LLC; 2015-07-01 to current/open; source msha-controller-operator-history