# Relationship history for MSHA mine 2102836

Current hierarchy: **Covia Holdings LLC → Covia Holdings Corporation → Kasota 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:** S C R-Sibelco Nv et al → Kasota Plant; 1950-01-01 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_mine:** S C R-Sibelco Nv et al → Kasota Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Unimin Minnesota Corp → Kasota Plant; 1981-06-01 to 2011-05-12; source msha-controller-operator-history
- **controller_controls_operator:** S C R-Sibelco Nv et al → Unimin Minnesota Corp; 1981-06-01 to 2011-05-12; source msha-controller-operator-history
- **operator_operates_mine:** Covia Holdings Corporation → Kasota Plant; 2011-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S C R-Sibelco Nv et al → Covia Holdings Corporation; 2011-05-13 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Covia Holdings LLC → Kasota Plant; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Covia Holdings LLC → Covia Holdings Corporation; 2021-01-01 to current/open; source msha-controller-operator-history