# Relationship history for MSHA mine 3201033

Current hierarchy: **Blackgold LLC; Michael C  Guillardi → Montana Aggregate Company, LLC → Montana Aggregate Williston Pit**

- 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:** Montana Aggregate Company, LLC → Montana Aggregate Williston Pit; 2014-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blackgold LLC et al → Montana Aggregate Williston Pit; 2014-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blackgold LLC et al → Montana Aggregate Company, LLC; 2014-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael C  Guillardi et al → Montana Aggregate Company, LLC; 2014-07-08 to current/open; source msha-controller-operator-history