 The development on these levels included, drifting on ore and excavation of raises between the 2800 and 3000 levels and some diamond drilling.The “lead ore” was ready for production in 1953 when a drift crew on the east end of the 3000 level exposed a wide siderite-tetrahedrite-chalcopyrite vein that assayed over 50 ounces per ton silver.ASARCO abandoned the silver-lead development and focused on this new high grade discovery.