# Relationship history for MSHA mine 0405879

Current hierarchy: **Morris Ravine Industrial Minerals LLC; Pinnacle Aggregates LLC; Mining a → Industrial Silica Products, LLC → Sierra Silica Resources**

- 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:** Sierra Silica Resources → Sierra Silica Resources; 2014-01-14 to 2023-11-27; source msha-controller-operator-history
- **controller_controls_mine:** Chris  Van Veldhuizen → Sierra Silica Resources; 2014-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Van Veldhuizen → Sierra Silica Resources; 2014-01-14 to 2023-11-27; source msha-controller-operator-history
- **operator_operates_mine:** Industrial Silica Products, LLC → Sierra Silica Resources; 2023-11-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Morris Ravine Industrial Minerals LLC et al → Sierra Silica Resources; 2023-11-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Morris Ravine Industrial Minerals LLC et al → Industrial Silica Products, LLC; 2023-11-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mining and Equipment LLC et al → Industrial Silica Products, LLC; 2023-11-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pinnacle Aggregates LLC et al → Industrial Silica Products, LLC; 2023-11-28 to current/open; source msha-controller-operator-history