# Relationship history for MSHA mine 4703319

Current hierarchy: **Greg  Darnick → Ridge Stone Products, Inc. → RSP-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:** Sharon  Darnick et al → RSP-Sand Plant; 1999-02-01 to 2022-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Ridge Stone Products Inc → RSP-Sand Plant; 2002-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sharon  Darnick et al → Ridge Stone Products Inc; 2002-07-24 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Darnick et al → Ridge Stone Products Inc; 2002-07-24 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Ron  Darnick et al → RSP-Sand Plant; 2023-01-01 to 2023-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Darnick et al → Ridge Stone Products Inc; 2023-01-01 to 2023-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Greg  Darnick et al → Ridge Stone Products Inc; 2023-01-01 to 2023-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Greg  Darnick → RSP-Sand Plant; 2024-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greg  Darnick → Ridge Stone Products Inc; 2024-01-01 to current/open; source msha-controller-operator-history