# Relationship history for MSHA mine 4105470

Current hierarchy: **Ignacio  Martinez → North American Silica Sand, LLC → North American Silica Sand, 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Proppant Tech - Poteet LLC → North American Silica Sand, LLC; 2019-10-21 to 2022-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Bon  Haldar et al → North American Silica Sand, LLC; 2019-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bon  Haldar et al → Proppant Tech - Poteet LLC; 2019-10-21 to 2022-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Murray  Moran et al → Proppant Tech - Poteet LLC; 2019-10-21 to 2022-05-30; source msha-controller-operator-history
- **operator_operates_mine:** North American Silica Sand, LLC → North American Silica Sand, LLC; 2022-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Murray  Moran et al → North American Silica Sand, LLC; 2022-05-31 to 2023-11-19; source msha-controller-operator-history
- **controller_controls_operator:** Murray  Moran et al → North American Silica Sand, LLC; 2022-05-31 to 2023-11-19; source msha-controller-operator-history
- **controller_controls_operator:** Bon  Haldar et al → North American Silica Sand, LLC; 2022-05-31 to 2023-11-19; source msha-controller-operator-history
- **controller_controls_operator:** Ignacio  Martinez et al → North American Silica Sand, LLC; 2022-05-31 to 2023-11-19; source msha-controller-operator-history
- **controller_controls_mine:** Ignacio  Martinez → North American Silica Sand, LLC; 2023-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ignacio  Martinez → North American Silica Sand, LLC; 2023-11-20 to current/open; source msha-controller-operator-history