# Relationship history for MSHA mine 4202720

Current hierarchy: **Bonnie Jo  Mathews; Steve Dean  Mathews → Dixie Dirt LLC → Snow Field Rock Products LLC**

- 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

- **operator_operates_mine:** Dixie Dirt LLC → Snow Field Rock Products LLC; 2020-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steve Dean  Mathews Et Al → Snow Field Rock Products LLC; 2020-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve Dean  Mathews Et Al → Dixie Dirt LLC; 2020-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bonnie Jo  Mathews Et Al → Dixie Dirt LLC; 2020-09-10 to current/open; source msha-controller-operator-history