# Relationship history for MSHA mine 1601581

Current hierarchy: **Richard Ryan  Dawson; Charles  Dawson → U.S. Sports Field Sand, LLC → U.S. Sports Field Sand- Greensburg 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Pioneer Mining Company LLC → U.S. Sports Field Sand- Greensburg Plant; 2018-11-15 to 2024-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Christopher B McDaniel et al → U.S. Sports Field Sand- Greensburg Plant; 2018-11-15 to 2021-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Christopher B McDaniel et al → Pioneer Mining Company LLC; 2018-11-15 to 2021-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Richard R Dawson et al → Pioneer Mining Company LLC; 2018-11-15 to 2021-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Michael L Busby et al → Pioneer Mining Company LLC; 2018-11-15 to 2021-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Richard R Dawson et al → U.S. Sports Field Sand- Greensburg Plant; 2021-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard R Dawson et al → Pioneer Mining Company LLC; 2021-03-01 to 2024-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Christopher B McDaniel et al → Pioneer Mining Company LLC; 2021-03-01 to 2024-07-31; source msha-controller-operator-history
- **operator_operates_mine:** U.S. Sports Field Sand, LLC → U.S. Sports Field Sand- Greensburg Plant; 2024-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Dawson → U.S. Sports Field Sand- Greensburg Plant; 2024-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Dawson → U.S. Sports Field Sand, LLC; 2024-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard Ryan  Dawson → U.S. Sports Field Sand, LLC; 2024-08-01 to current/open; source msha-controller-operator-history