# Relationship history for MSHA mine 1518979

Current hierarchy: ** → Big Run Mining → KY No 9**

- 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

- **controller_controls_mine:** Robert O  Roan → KY No 9; 2001-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** ROCO Enterprises Inc → KY No 9; 2006-03-17 to 2009-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Robert O  Roan → ROCO Enterprises Inc; 2006-03-17 to 2009-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Xinergy Ltd → KY No 9; 2009-05-12 to 2013-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Big Run Mining → KY No 9; 2009-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Xinergy Ltd → Big Run Mining; 2009-08-17 to 2013-02-04; source msha-controller-operator-history