# Relationship history for MSHA mine 0203514

Current hierarchy: **AMS Southwest LLC; Sand River Holdings LLC → PREMIER MATERIAL GROUP LLC → AGG #1**

- 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

- **controller_controls_mine:** Sand River Holdings LLC et al → AGG #1; 2022-03-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Premier Material Group LLC → AGG #1; 2024-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sand River Holdings LLC et al → Premier Material Group LLC; 2024-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** AMS Southwest LLC et al → Premier Material Group LLC; 2024-04-06 to current/open; source msha-controller-operator-history