# Relationship history for MSHA mine 4201705

Current hierarchy: **Thele Robert B → Yankee Gold & Silver Inc → Buffalo 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:** Yankee Gold & Silver Inc → Buffalo Mine; 1980-09-01 to 1983-09-19; source msha-controller-operator-history
- **controller_controls_mine:** Cramer Louis W → Buffalo Mine; 1980-09-01 to 1983-09-19; source msha-controller-operator-history
- **controller_controls_operator:** Cramer Louis W → Yankee Gold & Silver Inc; 1980-09-01 to 1983-09-19; source msha-controller-operator-history
- **operator_operates_mine:** Yankee Gold & Silver Inc → Buffalo Mine; 1983-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thele Robert B → Buffalo Mine; 1983-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thele Robert B → Yankee Gold & Silver Inc; 1983-09-20 to current/open; source msha-controller-operator-history