• May 6, 2026 the ore minerals and their intergrows : Also forms in oxidized zones, with vibrant blue color. Gold and Silver Ore Minerals Native Gold (Au): Occurs as free grains or nuggets. Native Silver (Ag): Often found with gold or as separate mineral deposits. Ag-rich Sulfides: Such as argentite (Ag₂S). Lead and Zinc Ore M BY Darnell Schamberger MD