# Relationship history for MSHA mine 4105109

Current hierarchy: **Dwight Elton  Rice → Big Creek Sand and Gravel, Inc. → Crutch Ranch 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

- **controller_controls_mine:** Dwight Elton  Rice et al → Crutch Ranch Pit; 2012-01-01 to 2019-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Big Creek Sand and Gravel, Inc. → Crutch Ranch Pit; 2015-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dwight Elton  Rice et al → Big Creek Sand and Gravel, Inc.; 2015-02-02 to 2019-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Karen  Rice et al → Big Creek Sand and Gravel, Inc.; 2015-02-02 to 2019-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Dwight Elton  Rice → Crutch Ranch Pit; 2019-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dwight Elton  Rice → Big Creek Sand and Gravel, Inc.; 2019-12-01 to current/open; source msha-controller-operator-history