# Relationship history for MSHA mine 0405950

Current hierarchy: **John R  Struiksma → WEST COAST AGGREGATE SUPPLY INC. → VALLEY SALT**

- 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:** Marvin J  Struiksma et al → VALLEY SALT; 2000-06-19 to 2026-01-26; source msha-controller-operator-history
- **operator_operates_mine:** Valley Salt LLC → VALLEY SALT; 2020-10-15 to 2022-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Terry  Walker et al → VALLEY SALT; 2020-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry  Walker et al → Valley Salt LLC; 2020-10-15 to 2022-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Coleman → Valley Salt LLC; 2020-10-15 to 2022-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Gary A Pedersen et al → Valley Salt LLC; 2020-10-15 to 2022-08-31; source msha-controller-operator-history
- **operator_operates_mine:** West Coast Aggregate Supply Inc. → VALLEY SALT; 2022-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marvin J  Struiksma et al → West Coast Aggregate Supply Inc.; 2022-09-01 to 2026-01-26; source msha-controller-operator-history
- **controller_controls_mine:** John R  Struiksma et al → VALLEY SALT; 2026-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Struiksma et al → West Coast Aggregate Supply Inc.; 2026-01-27 to current/open; source msha-controller-operator-history