# Relationship history for MSHA mine 3100718

Current hierarchy: **Scott L.  Bradsher; Vera  Bradsher → Southern Products and Silica Company → Drowning Creek Dredge & Plant**

- 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:** Southern Products & Silica Company Inc → Drowning Creek Dredge & Plant; 1950-01-01 to 2013-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Marshall B  Gilchrist → Drowning Creek Dredge & Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marshall B  Gilchrist → Southern Products & Silica Company Inc; 1950-01-01 to 2013-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Southern Products and Silica Company → Drowning Creek Dredge & Plant; 2013-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert L  Bradsher → Drowning Creek Dredge & Plant; 2013-01-31 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Bradsher → Southern Products and Silica Company; 2013-01-31 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Robert L. Bradsher Family Trust → Drowning Creek Dredge & Plant; 2021-10-01 to 2024-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Robert L. Bradsher Family Trust → Southern Products and Silica Company; 2021-10-01 to 2024-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Vera  Bradsher et al → Drowning Creek Dredge & Plant; 2024-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vera  Bradsher et al → Southern Products and Silica Company; 2024-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott L.  Bradsher et al → Southern Products and Silica Company; 2024-07-15 to current/open; source msha-controller-operator-history