# Relationship history for MSHA mine 0900057

Current hierarchy: **Echols Mill Quarries LLC; Allgood Granite Products LLC; Bear Creek Minin → Savannah Valley Quarries, LLC → Boyd**

- 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:** Boyd Granite Company Inc → Boyd; 1977-09-01 to 2020-11-24; source msha-controller-operator-history
- **controller_controls_mine:** James R  Boyd  et al → Boyd; 1977-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James R  Boyd  et al → Boyd Granite Company Inc; 1977-09-01 to 2020-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Randy K  Smith  et al → Boyd; 2008-03-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Echols Mill Quarries LLC → Boyd; 2020-11-25 to 2022-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Randy K  Smith  et al → Echols Mill Quarries LLC; 2020-11-25 to 2022-01-31; source msha-controller-operator-history
- **controller_controls_operator:** David W  Dye  et al → Echols Mill Quarries LLC; 2020-11-25 to 2022-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Allgood Granite Products LLC et al → Boyd; 2021-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Savannah Valley Quarries, LLC → Boyd; 2022-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allgood Granite Products LLC et al → Savannah Valley Quarries, LLC; 2022-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bear Creek Mining LLC et al → Savannah Valley Quarries, LLC; 2022-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Echols Mill Quarries LLC et al → Savannah Valley Quarries, LLC; 2022-02-01 to current/open; source msha-controller-operator-history