# Relationship history for MSHA mine 2602020

Current hierarchy: **Nevada Resources & Development Corp → Gd Resources Inc → Toiyabe Project-Saddle Gold Deposit**

- 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:** N A Degerstrom → Toiyabe Project-Saddle Gold Deposit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** N A Degerstrom Inc → Toiyabe Project-Saddle Gold Deposit; 1987-08-01 to 1993-12-31; source msha-controller-operator-history
- **controller_controls_operator:** N A Degerstrom → N A Degerstrom Inc; 1987-08-01 to 1993-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Gd Resources Inc → Toiyabe Project-Saddle Gold Deposit; 1994-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nevada Resources & Development Corp → Toiyabe Project-Saddle Gold Deposit; 1994-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nevada Resources & Development Corp → Gd Resources Inc; 1994-01-01 to current/open; source msha-controller-operator-history