 The new discovery was called the Silver vein and has been the largest vein found at the Galena to date with estimated production of over 100 million ounces of silver at averages grades of over 20 ounces per ton.From 1953 until present, all exploration, development and production has been focused on the tetrahedrite silver-copper ores.Because ASARCO focused its efforts in 1953 on the silver-copper veins no systematic exploration program was ever conducted at the Galena for silver-lead ore until USSC took over in 2006.