# Relationship history for MSHA mine 0800798

Current hierarchy: **Nutrien LTD → White Springs Ag Chems Inc dba Nutrien → Swift Creek Mine**

- 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:** White Springs Agricultural Chemicals Inc → Swift Creek Mine; 1950-01-01 to 1996-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Occidental Petroleum Corp → Swift Creek Mine; 1950-01-01 to 1996-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Occidental Petroleum Corp → White Springs Agricultural Chemicals Inc; 1950-01-01 to 1996-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Potash Corp Of Saskatchewan → Swift Creek Mine; 1995-11-01 to 2017-12-31; source msha-controller-operator-history
- **operator_operates_mine:** White Springs Ag Chems Inc dba Nutrien → Swift Creek Mine; 1996-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Potash Corp Of Saskatchewan → White Springs Ag Chems Inc dba Nutrien; 1996-02-26 to 2017-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Nutrien LTD → Swift Creek Mine; 2018-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nutrien LTD → White Springs Ag Chems Inc dba Nutrien; 2018-01-01 to current/open; source msha-controller-operator-history