# Relationship history for MSHA mine 4202725

Current hierarchy: **CRH PLC → Ash Grove Cement Company → Ash Grove Tooele 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Ash Grove Cement Company → Ash Grove Tooele Plant; 1950-01-01 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Ash Grove Tooele Plant; 2018-06-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Geofortis, LLC. → Ash Grove Tooele Plant; 2021-04-08 to 2024-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Old Harbor Native Corporation Et Al → Ash Grove Tooele Plant; 2021-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Old Harbor Native Corporation Et Al → Geofortis, LLC.; 2021-04-08 to 2024-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Jarrett Et Al → Geofortis, LLC.; 2021-04-08 to 2024-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Ash Grove Cement Company → Ash Grove Tooele Plant; 2024-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ash Grove Cement Company → Ash Grove Cement Company; 2024-09-12 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Ash Grove Cement Company; 2024-09-12 to current/open; source msha-controller-operator-history