# Relationship history for MSHA mine 3901609

Current hierarchy: **Colt  Floyd → Ace in the Hole Construction, LLC → Kalisiak Scoria 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

- **operator_operates_mine:** Ace in the Hole Construction, LLC → Kalisiak Scoria Mine; 2015-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Colt  Floyd → Kalisiak Scoria Mine; 2015-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colt  Floyd → Ace in the Hole Construction, LLC; 2015-05-12 to current/open; source msha-controller-operator-history