# Relationship history for MSHA mine 3102014

Current hierarchy: **Blue Ridge Sand  Holdings LLC → Blue Ridge Sand Operations LLC → Great Pit**

- 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

- **operator_operates_mine:** Pretty Good Sand Company Inc → Great Pit; 1988-03-01 to 2016-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Roger E Sauerborn → Great Pit; 1988-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger E Sauerborn → Pretty Good Sand Company Inc; 1988-03-01 to 2016-05-31; source msha-controller-operator-history
- **operator_operates_mine:** PGS Aggregates, LLC → Great Pit; 2016-06-01 to 2023-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Matthew R Pipkin → Great Pit; 2016-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew R Pipkin → PGS Aggregates, LLC; 2016-06-01 to 2023-06-04; source msha-controller-operator-history
- **operator_operates_mine:** Blue Ridge Sand Operations LLC → Great Pit; 2023-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blue Ridge Sand  Holdings LLC → Great Pit; 2023-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blue Ridge Sand  Holdings LLC → Blue Ridge Sand Operations LLC; 2023-06-05 to current/open; source msha-controller-operator-history