# Relationship history for MSHA mine 5002021

Current hierarchy: **Arctic Slope Regional Corp → ASRC Civil Construction LLC → Bettles 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

- **controller_controls_mine:** Arctic Slope Regional Corp → Bettles Gravel Pit; 2009-03-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** ASRC Civil Construction LLC → Bettles Gravel Pit; 2014-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arctic Slope Regional Corp → ASRC Civil Construction LLC; 2014-06-23 to current/open; source msha-controller-operator-history