# Relationship history for MSHA mine 4105318

Current hierarchy: **Eric  Sanchez; Gilbert Lara  Sanchez → Desert Rock Co. → Sierra Red Quarry**

- 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:** Gilbert L  Sanchez → Sierra Red Quarry; 2010-04-21 to 2017-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Desert Rock Co. → Sierra Red Quarry; 2017-11-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gilbert L  Sanchez → Desert Rock Co.; 2017-11-22 to 2017-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Eric  Sanchez et al → Sierra Red Quarry; 2018-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric  Sanchez et al → Desert Rock Co.; 2018-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gilbert Lara  Sanchez et al → Desert Rock Co.; 2018-01-01 to current/open; source msha-controller-operator-history