# Relationship history for MSHA mine 0504847

Current hierarchy: **Bennie C  Koch → Rocky Mountain Excavating LLC → Iron Mtn Rd Gravel 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Cooper Excavating → Iron Mtn Rd Gravel Pit; 2006-05-23 to 2013-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Shane L  Cooper → Iron Mtn Rd Gravel Pit; 2006-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shane L  Cooper → Cooper Excavating; 2006-05-23 to 2013-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Dirt Guys LLC → Iron Mtn Rd Gravel Pit; 2013-07-12 to 2015-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Shane L  Cooper → Iron Mtn Rd Gravel Pit; 2013-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shane L  Cooper → Dirt Guys LLC; 2013-07-12 to 2015-09-20; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Mountain Excavating LLC → Iron Mtn Rd Gravel Pit; 2015-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bennie C  Koch → Iron Mtn Rd Gravel Pit; 2015-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bennie C  Koch → Rocky Mountain Excavating LLC; 2015-09-21 to current/open; source msha-controller-operator-history