# Relationship history for MSHA mine 2102404

Current hierarchy: **Covia Holdings LLC → Unimin Corp → Unimin Corp-Jordan Pit And 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** S C R-Sibelco Nv et al → Unimin Corp-Jordan Pit And Plant; 1950-01-01 to 2020-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Jordan Quartz Company Inc → Unimin Corp-Jordan Pit And Plant; 1950-01-01 to 1980-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Jordan Quartz Company Inc → Unimin Corp-Jordan Pit And Plant; 1950-01-01 to 1980-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Jordan Quartz Company Inc → Jordan Quartz Company Inc; 1950-01-01 to 1980-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Minnesota Frac Sand → Unimin Corp-Jordan Pit And Plant; 1980-09-01 to 1986-08-05; source msha-controller-operator-history
- **controller_controls_mine:** J L Shiely  Company → Unimin Corp-Jordan Pit And Plant; 1980-09-01 to 1986-08-05; source msha-controller-operator-history
- **controller_controls_operator:** J L Shiely  Company → Minnesota Frac Sand; 1980-09-01 to 1986-08-05; source msha-controller-operator-history
- **operator_operates_mine:** Unimin Corp → Unimin Corp-Jordan Pit And Plant; 1986-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S C R-Sibelco Nv et al → Unimin Corp; 1986-08-06 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Covia Holdings LLC → Unimin Corp-Jordan Pit And Plant; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Covia Holdings LLC → Unimin Corp; 2021-01-01 to current/open; source msha-controller-operator-history