# Relationship history for MSHA mine 2602594

Current hierarchy: **Elliott (Bud) E Farmer; Michael K Farmer → Sierra Ready Mix → Sierra Ready Mix 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:** Harold  Elam → Sierra Ready Mix Quarry; 1950-01-01 to 2011-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Sierra Ready Mix, LLC → Sierra Ready Mix Quarry; 2006-05-16 to 2016-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Jeff W  Davis → Sierra Ready Mix Quarry; 2006-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff W  Davis → Sierra Ready Mix, LLC; 2006-05-16 to 2016-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Sierra Ready Mix Quarry; 2011-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sierra Ready Mix → Sierra Ready Mix Quarry; 2016-05-02 to 2024-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Elam → Sierra Ready Mix; 2016-05-02 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Sierra Ready Mix; 2016-05-02 to 2024-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Sierra Ready Mix → Sierra Ready Mix Quarry; 2024-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Elliott (Bud) E Farmer  et al → Sierra Ready Mix Quarry; 2024-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elliott (Bud) E Farmer  et al → Sierra Ready Mix; 2024-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael K Farmer  et al → Sierra Ready Mix; 2024-01-31 to current/open; source msha-controller-operator-history