# Relationship history for MSHA mine 2902306

Current hierarchy: **CRH PLC → Oldcastle SW Group Inc → FCM Washplant #2**

- 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:** CRH PLC → FCM Washplant #2; 1998-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Southern Ute Indian Tribe → FCM Washplant #2; 2004-01-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sky Ute Sand & Gravel, LLC → FCM Washplant #2; 2006-02-13 to 2011-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Southern Ute Indian Tribe → Sky Ute Sand & Gravel, LLC; 2006-02-13 to 2011-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle SW Group Inc → FCM Washplant #2; 2011-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle SW Group Inc; 2011-04-15 to current/open; source msha-controller-operator-history