# Relationship history for MSHA mine 1400803

Current hierarchy: **Compass Minerals International, Inc. → North American Salt Company → Brine Wells & 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Carey Salt Div-Interpace Corp → Brine Wells & Plant; 1950-01-01 to 1979-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Jon  Rhine → Brine Wells & Plant; 1950-01-01 to 1979-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Jon  Rhine → Carey Salt Div-Interpace Corp; 1950-01-01 to 1979-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Fording Inc → Brine Wells & Plant; 1979-08-03 to 1988-08-19; source msha-controller-operator-history
- **operator_operates_mine:** Carey Salt Inc → Brine Wells & Plant; 1979-10-15 to 1988-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Fording Inc → Carey Salt Inc; 1979-10-15 to 1988-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Harris Chemical Group → Brine Wells & Plant; 1988-03-11 to 2001-11-27; source msha-controller-operator-history
- **operator_operates_mine:** North American Salt Company → Brine Wells & Plant; 1988-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harris Chemical Group → North American Salt Company; 1988-08-20 to 2001-11-27; source msha-controller-operator-history
- **controller_controls_mine:** Compass Minerals International, Inc. → Brine Wells & Plant; 2001-11-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Compass Minerals International, Inc. → North American Salt Company; 2001-11-28 to current/open; source msha-controller-operator-history