# Relationship history for MSHA mine 4609136

Current hierarchy: **Coal Field Transports, Inc. → Big River Mining LLC → Broad Run 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:** Big River Mining LLC → Broad Run Mine; 2005-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randel L  Richmond → Broad Run Mine; 2005-12-06 to 2007-06-27; source msha-controller-operator-history
- **controller_controls_operator:** Randel L  Richmond → Big River Mining LLC; 2005-12-06 to 2007-06-27; source msha-controller-operator-history
- **controller_controls_mine:** Coal Field Transports, Inc. → Broad Run Mine; 2007-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coal Field Transports, Inc. → Big River Mining LLC; 2007-06-28 to current/open; source msha-controller-operator-history