# Relationship history for MSHA mine 0900815

Current hierarchy: **Valerie  Carnes → Standard Sand & Silica Company → IVEY SAND 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

- **controller_controls_mine:** Lemuel Baylis  Carnes III → IVEY SAND PLANT; 1950-01-01 to 2024-02-25; source msha-controller-operator-history
- **operator_operates_mine:** M & W Sand Company → IVEY SAND PLANT; 1950-01-01 to 1988-12-31; source msha-controller-operator-history
- **controller_controls_mine:** R Lawrence  Martin → IVEY SAND PLANT; 1950-01-01 to 1988-12-31; source msha-controller-operator-history
- **controller_controls_operator:** R Lawrence  Martin → M & W Sand Company; 1950-01-01 to 1988-12-31; source msha-controller-operator-history
- **operator_operates_mine:** M & W Sand → IVEY SAND PLANT; 1989-01-01 to 2000-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Daniel Ed  Clance → IVEY SAND PLANT; 1989-01-01 to 2000-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Daniel Ed  Clance → M & W Sand; 1989-01-01 to 2000-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Standard Sand & Silica Company → IVEY SAND PLANT; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lemuel Baylis  Carnes III → Standard Sand & Silica Company; 2000-11-01 to 2024-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Valerie  Carnes → IVEY SAND PLANT; 2024-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Valerie  Carnes → Standard Sand & Silica Company; 2024-02-26 to current/open; source msha-controller-operator-history