# Relationship history for MSHA mine 4105187

Current hierarchy: **Summit Materials LLC → Alleyton Resource Co. LLC → Duncan Plant**

- 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

- **controller_controls_mine:** Todd  Barten Et Al → Duncan Plant; 2010-03-19 to 2014-01-22; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Duncan Plant; 2014-01-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alleyton Resource Co. LLC → Duncan Plant; 2016-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd  Barten Et Al → Alleyton Resource Co. LLC; 2016-04-07 to 2014-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Alleyton Resource Co. LLC; 2016-04-07 to current/open; source msha-controller-operator-history