# Relationship history for MSHA mine 1102673

Current hierarchy: **VOTORANTIM CIMENTOS → VCNA Prairie Aggregates Illinois, Inc → Yard 96 - Springbay**

- 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:** Construction Materials Company → Yard 96 - Springbay; 1979-01-01 to 1997-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Lone Star Industries Inc → Yard 96 - Springbay; 1979-01-01 to 1997-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc → Construction Materials Company; 1979-01-01 to 1997-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Prairie Group → Yard 96 - Springbay; 1984-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Prairie Material Sales, Inc. - Aggregate Division → Yard 96 - Springbay; 1997-03-27 to 2008-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Prairie Group → Prairie Material Sales, Inc. - Aggregate Division; 1997-03-27 to 2008-02-01; source msha-controller-operator-history
- **operator_operates_mine:** VCNA Prairie Aggregates Illinois, Inc → Yard 96 - Springbay; 2008-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** VOTORANTIM CIMENTOS → Yard 96 - Springbay; 2008-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** VOTORANTIM CIMENTOS → VCNA Prairie Aggregates Illinois, Inc; 2008-02-02 to current/open; source msha-controller-operator-history