# Relationship history for MSHA mine 1202260

Current hierarchy: **VOTORANTIM CIMENTOS → VCNA Prairie LLC → Yard 78 - Bloomfield**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Prairie Group → Yard 78 - Bloomfield; 1984-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Prairie Material Sales Inc → Yard 78 - Bloomfield; 1999-11-01 to 2008-04-10; source msha-controller-operator-history
- **controller_controls_operator:** Prairie Group → Prairie Material Sales Inc; 1999-11-01 to 2008-04-10; source msha-controller-operator-history
- **controller_controls_mine:** VOTORANTIM CIMENTOS → Yard 78 - Bloomfield; 2008-02-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** VCNA Prairie Aggregates IN, Inc. → Yard 78 - Bloomfield; 2008-04-11 to 2012-04-11; source msha-controller-operator-history
- **controller_controls_mine:** VOTORANTIM CIMENTOS → Yard 78 - Bloomfield; 2008-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** VOTORANTIM CIMENTOS → VCNA Prairie Aggregates IN, Inc.; 2008-04-11 to 2012-04-11; source msha-controller-operator-history
- **operator_operates_mine:** VCNA Prairie LLC → Yard 78 - Bloomfield; 2012-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** VOTORANTIM CIMENTOS → VCNA Prairie LLC; 2012-04-12 to current/open; source msha-controller-operator-history