# Relationship history for MSHA mine 0100617

Current hierarchy: **USS Holdings Inc → U.S. Silica Company, LLC → Hurtsboro 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

- **operator_operates_mine:** Tri-State Sand Company → Hurtsboro Plant; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Wills et al → Hurtsboro Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Wills et al → Tri-State Sand Company; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Dee  Wills Goodwin et al → Tri-State Sand Company; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Ray  Lowery → Hurtsboro Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Warrior Sand & Gravel Company Inc → Hurtsboro Plant; 1979-10-01 to 1987-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Ray  Lowery → Warrior Sand & Gravel Company Inc; 1979-10-01 to 1987-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Rio Tinto Group → Hurtsboro Plant; 1986-04-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** U S Silica Company → Hurtsboro Plant; 1987-11-01 to 1996-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Rio Tinto Group → U S Silica Company; 1987-11-01 to 1996-03-08; source msha-controller-operator-history
- **operator_operates_mine:** U.S. Silica Company, LLC → Hurtsboro Plant; 1996-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** USS Holdings Inc → Hurtsboro Plant; 1996-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** USS Holdings Inc → U.S. Silica Company, LLC; 1996-03-09 to current/open; source msha-controller-operator-history