# Relationship history for MSHA mine 0405579

Current hierarchy: **Raul A Hernandez → Big Iron DG Mine LLC → Big Iron DG 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Big Iron Construction & Landscape Material → Big Iron DG Mine; 2003-12-15 to 2015-11-02; source msha-controller-operator-history
- **controller_controls_mine:** Dan L  Spoor → Big Iron DG Mine; 2003-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan L  Spoor → Big Iron Construction & Landscape Material; 2003-12-15 to 2015-11-02; source msha-controller-operator-history
- **operator_operates_mine:** Big Iron Materials → Big Iron DG Mine; 2015-11-03 to 2024-09-12; source msha-controller-operator-history
- **controller_controls_mine:** Richard W  Bolin → Big Iron DG Mine; 2015-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard W  Bolin → Big Iron Materials; 2015-11-03 to 2024-09-12; source msha-controller-operator-history
- **operator_operates_mine:** Big Iron DG Mine LLC → Big Iron DG Mine; 2024-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raul A Hernandez → Big Iron DG Mine; 2024-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raul A Hernandez → Big Iron DG Mine LLC; 2024-09-13 to current/open; source msha-controller-operator-history