# Relationship history for MSHA mine 2200792

Current hierarchy: **Michel B  Moreno → Green Field Energy Technologies, LLC → Nicholson Pit**

- 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

- **operator_operates_mine:** Sand Specialties and Aggregates LLC → Nicholson Pit; 2009-01-15 to 2009-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Marc  Nunez et al → Nicholson Pit; 2009-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marc  Nunez et al → Sand Specialties and Aggregates LLC; 2009-01-15 to 2009-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Moncrief et al → Sand Specialties and Aggregates LLC; 2009-01-15 to 2009-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Mass P  Blackwell → Nicholson Pit; 2009-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blackwell Aggregates, Inc. → Nicholson Pit; 2009-09-01 to 2011-11-06; source msha-controller-operator-history
- **controller_controls_operator:** Mass P  Blackwell → Blackwell Aggregates, Inc.; 2009-09-01 to 2011-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Michel B  Moreno et al → Nicholson Pit; 2011-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Green Field Energy Technologies, LLC → Nicholson Pit; 2011-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michel B  Moreno et al → Green Field Energy Technologies, LLC; 2011-11-07 to current/open; source msha-controller-operator-history