# Relationship history for MSHA mine 4101295

Current hierarchy: **Covia Holdings LLC → Unimin Texas Company L P → VanHorn**

- 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:** Southern Clay Products Inc → VanHorn; 1950-01-01 to 1991-09-24; source msha-controller-operator-history
- **controller_controls_mine:** English China Clays PLC → VanHorn; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** English China Clays PLC → Southern Clay Products Inc; 1950-01-01 to 1991-09-24; source msha-controller-operator-history
- **controller_controls_mine:** S C R-Sibelco Nv et al → VanHorn; 1950-01-01 to 2020-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Southern Clay Products Inc → VanHorn; 1991-09-25 to 1992-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Laporte Plc → VanHorn; 1991-09-25 to 2002-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Laporte Plc → Southern Clay Products Inc; 1991-09-25 to 1992-02-23; source msha-controller-operator-history
- **operator_operates_mine:** United Clays Of Texas Inc → VanHorn; 1992-02-24 to 1999-10-03; source msha-controller-operator-history
- **controller_controls_mine:** Watts Blake Bearne & Company Plc → VanHorn; 1992-02-24 to 1999-11-09; source msha-controller-operator-history
- **controller_controls_operator:** Watts Blake Bearne & Company Plc → United Clays Of Texas Inc; 1992-02-24 to 1999-10-03; source msha-controller-operator-history
- **operator_operates_mine:** Unimin Texas Company L P → VanHorn; 1999-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S C R-Sibelco Nv et al → Unimin Texas Company L P; 1999-10-04 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Rockwood Specialties Group Inc → VanHorn; 2002-10-31 to 2013-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Rockwood Specialties Group Inc → Southern Clay Products Inc; 2002-10-31 to 1992-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Altana Group (Germany) → VanHorn; 2013-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Altana Group (Germany) → Southern Clay Products Inc; 2013-10-01 to 1992-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Covia Holdings LLC → VanHorn; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Covia Holdings LLC → Unimin Texas Company L P; 2021-01-01 to current/open; source msha-controller-operator-history