# Relationship history for MSHA mine 0300313

Current hierarchy: **Covia Holdings LLC → Covia Solutions LLC → Guion 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 → Guion Plant; 1950-01-01 to 2020-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Silica Products Company Inc → Guion Plant; 1950-01-01 to 1988-08-15; source msha-controller-operator-history
- **controller_controls_mine:** Sam C  Cooke → Guion Plant; 1950-01-01 to 1988-08-15; source msha-controller-operator-history
- **controller_controls_operator:** Sam C  Cooke → Silica Products Company Inc; 1950-01-01 to 1988-08-15; source msha-controller-operator-history
- **operator_operates_mine:** Covia Solutions Inc. → Guion Plant; 1988-08-16 to 2024-07-31; source msha-controller-operator-history
- **controller_controls_operator:** S C R-Sibelco Nv et al → Covia Solutions Inc.; 1988-08-16 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Covia Holdings LLC → Guion Plant; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Covia Holdings LLC → Covia Solutions Inc.; 2021-01-01 to 2024-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Covia Solutions LLC → Guion Plant; 2024-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Covia Holdings LLC → Guion Plant; 2024-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Covia Holdings LLC → Covia Solutions LLC; 2024-08-01 to current/open; source msha-controller-operator-history