# Relationship history for MSHA mine 4609177

Current hierarchy: **CONSOL Energy Inc → Consol of Kentucky Inc → Big Branch No 1 Belt 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

- **controller_controls_mine:** CONSOL Energy Inc → Big Branch No 1 Belt Mine; 1986-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CONSOL Energy Inc → Big Branch No 1 Belt Mine; 2005-03-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern West Virginia Resources LLC → Big Branch No 1 Belt Mine; 2006-08-16 to 2009-03-24; source msha-controller-operator-history
- **controller_controls_operator:** CONSOL Energy Inc → Southern West Virginia Resources LLC; 2006-08-16 to 2009-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Consol of Kentucky Inc → Big Branch No 1 Belt Mine; 2009-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CONSOL Energy Inc → Consol of Kentucky Inc; 2009-03-25 to current/open; source msha-controller-operator-history