# Relationship history for MSHA mine 3608613

Current hierarchy: **John W  Rich → Selkirk Enterprises LLC → Silverton Stripping**

- 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:** Selkirk Mining Company → Silverton Stripping; 1997-03-01 to 2005-06-02; source msha-controller-operator-history
- **controller_controls_mine:** David M  Ryon → Silverton Stripping; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David M  Ryon → Selkirk Mining Company; 1997-03-01 to 2005-06-02; source msha-controller-operator-history
- **operator_operates_mine:** Selkirk Enterprises LLC → Silverton Stripping; 2005-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John W  Rich et al → Silverton Stripping; 2005-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John W  Rich et al → Selkirk Enterprises LLC; 2005-06-03 to current/open; source msha-controller-operator-history