 The single largest and most productive vein in the Galena and Coeur mines is the Galena’s silver vein which has produced over 25 million ounces of silver and is located in the hanging wall of the Polaris fault.The trend-based exploration caused the workings to be developed in northwesterly trend because of numerous secondary ore vein bearing veins in the footwall of the silver vein.This development direction caused the workings to cross into the footwall of the Polaris leaving the entire hanging wall of the Polaris fault virtually unexplored for about from the eastern side of the Galena to the boundary with the Sunshine Mine.