# Relationship history for MSHA mine 4104224

Current hierarchy: **Eric  Sanchez; Gilbert Lara  Sanchez → Desert Rock Company → Roadrunner Sand Pit**

- 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

- **operator_operates_mine:** Desert Rock Company → Roadrunner Sand Pit; 2000-10-01 to 2010-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Gilbert L  Sanchez → Roadrunner Sand Pit; 2002-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gilbert L  Sanchez → Desert Rock Company; 2002-05-28 to 2010-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Desert Rock Company → Roadrunner Sand Pit; 2010-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gilbert L  Sanchez → Roadrunner Sand Pit; 2010-04-21 to 2017-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Gilbert L  Sanchez → Desert Rock Company; 2010-04-21 to 2017-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Eric  Sanchez et al → Roadrunner Sand Pit; 2018-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric  Sanchez et al → Desert Rock Company; 2018-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gilbert Lara  Sanchez et al → Desert Rock Company; 2018-01-01 to current/open; source msha-controller-operator-history