# Relationship history for MSHA mine 0504855

Current hierarchy: **Robert  Geraghty → Mt Elbert Mining Co LLC → Willow 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Mt Elbert Mining Co LLC → Willow Creek Mine; 2006-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kay B  Blecha → Willow Creek Mine; 2006-08-31 to 2015-01-16; source msha-controller-operator-history
- **controller_controls_operator:** Kay B  Blecha → Mt Elbert Mining Co LLC; 2006-08-31 to 2015-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Geraghty → Willow Creek Mine; 2015-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Geraghty → Mt Elbert Mining Co LLC; 2015-01-17 to current/open; source msha-controller-operator-history