# Relationship history for MSHA mine 0301997

Current hierarchy: **White Horse Rider Sand Co; Sand Pros → White Horse Rider Sand Inc. → Harkey Road 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** White Horse Rider Sand Inc. → Harkey Road Plant; 2010-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sand Pros et al → Harkey Road Plant; 2010-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sand Pros et al → White Horse Rider Sand Inc.; 2010-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** White Horse Rider Sand Co et al → White Horse Rider Sand Inc.; 2010-07-01 to current/open; source msha-controller-operator-history