Exhibit A

JOINT FILING AGREEMENT

The undersigned agree that this Schedule 13G Amendment No. 4 dated February 5, 2026 relating to the Common Shares without par value, of Vista Gold Corp. shall be filed on behalf of the undersigned.

SUN VALLEY GOLD LLC

By: /s/ Peter F. Palmedo

Name: Peter F. Palmedo

Title:   Managing Member

PALMEDO HOLDINGS LLLP

By: /s/ Peter F. Palmedo

Name: Peter F. Palmedo

Title:   General Partner

SUN VALLEY GOLD MASTER FUND, LTD.

By: /s/ Peter F. Palmedo

Name: Peter F. Palmedo

Title:   Director

PETER F. PALMEDO

By: /s/ Peter F. Palmedo