# Relationship history for MSHA mine 0505099

Current hierarchy: **Summit Materials LLC → Peak Mtls → Cottonwood Quarry**

- 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:** Harold  Elam → Cottonwood Quarry; 1950-01-01 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Cottonwood Quarry; 2011-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peak Mtls → Cottonwood Quarry; 2018-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Elam → Peak Mtls; 2018-10-09 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Peak Mtls; 2018-10-09 to current/open; source msha-controller-operator-history