# Relationship history for MSHA mine 2902077

Current hierarchy: **Sanders Gary → Grubstake Mining & Exploration Inc → Grubstake Mining & Exploration Incorpora**

- 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:** Grubstake Mining & Exploration Inc → Grubstake Mining & Exploration Incorpora; 1991-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sanders Gary → Grubstake Mining & Exploration Incorpora; 1991-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sanders Gary → Grubstake Mining & Exploration Inc; 1991-10-01 to current/open; source msha-controller-operator-history