# Relationship history for MSHA mine 4101048

Current hierarchy: **Hanson PLC → Hanson Aggregates Central Incorporated → SPRING CREEK 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Borger Sand & Gravel Company Inc → SPRING CREEK PLANT; 1950-01-01 to 1998-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Charles D  Baldwin → SPRING CREEK PLANT; 1950-01-01 to 1998-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Charles D  Baldwin → Borger Sand & Gravel Company Inc; 1950-01-01 to 1998-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer International Ltd → SPRING CREEK PLANT; 1984-08-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer South Central Inc → SPRING CREEK PLANT; 1998-02-05 to 2000-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd → Pioneer South Central Inc; 1998-02-05 to 2000-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Central Incorporated → SPRING CREEK PLANT; 2000-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → SPRING CREEK PLANT; 2000-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Central Incorporated; 2000-08-04 to current/open; source msha-controller-operator-history