# Relationship history for MSHA mine 3800027

Current hierarchy: **FMC Corp → Spartan Minerals Corp → SPARTAN MINERALS MILL**

- 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:** Spartan Minerals Corp → SPARTAN MINERALS MILL; 1950-01-01 to 1987-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Gulf USA Corp → SPARTAN MINERALS MILL; 1950-01-01 to 1987-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Gulf USA Corp → Spartan Minerals Corp; 1950-01-01 to 1987-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Spartan Minerals Corp → SPARTAN MINERALS MILL; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** FMC Corp → SPARTAN MINERALS MILL; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** FMC Corp → Spartan Minerals Corp; 1988-01-01 to current/open; source msha-controller-operator-history