# Relationship history for MSHA mine 3503921

Current hierarchy: **Wilks Ranch Holdings LLC → Wilks Ranch Texas, Ltd. → Auburn Creek Mine**

- 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

- **operator_operates_mine:** Octagon Constructors, LLC → Auburn Creek Mine; 2021-05-26 to 2024-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Yauna  Smith → Auburn Creek Mine; 2021-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Yauna  Smith → Octagon Constructors, LLC; 2021-05-26 to 2024-07-30; source msha-controller-operator-history
- **operator_operates_mine:** Wilks Ranch Texas, Ltd. → Auburn Creek Mine; 2024-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wilks Ranch Holdings LLC et al → Auburn Creek Mine; 2024-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilks Ranch Holdings LLC et al → Wilks Ranch Texas, Ltd.; 2024-07-31 to current/open; source msha-controller-operator-history