# Relationship history for MSHA mine 4103491

Current hierarchy: **Summit Materials LLC → Alleyton Resource Company, LLC. → Hockley 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:** Mid America Materials Company → Hockley Plant; 1986-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Materials → Hockley Plant; 1987-10-01 to 2001-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Mid America Materials Company → Hallett Materials; 1987-10-01 to 2001-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Materials → Hockley Plant; 2001-08-11 to 2021-01-10; source msha-controller-operator-history
- **controller_controls_mine:** Rasmussen Group Inc → Hockley Plant; 2001-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rasmussen Group Inc → Hallett Materials; 2001-08-11 to 2021-01-10; source msha-controller-operator-history
- **controller_controls_mine:** Todd  Barten Et Al → Hockley Plant; 2010-03-19 to 2014-01-22; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Hockley Plant; 2014-01-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alleyton Resource Company, LLC. → Hockley Plant; 2021-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd  Barten Et Al → Alleyton Resource Company, LLC.; 2021-01-11 to 2014-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Alleyton Resource Company, LLC.; 2021-01-11 to current/open; source msha-controller-operator-history