Operations in The United States
Doe Run's U.S. mines are all on the Viburnum Trend, a 64 km long mineralized shoot with an average width of 150 meters, thickness of 3 to 30 meters and average depth of 300 meters. It is a classic Mississippi Valley type lead/zinc deposit in Cambrian carbonate rocks though it contains an unusually high proportion of lead. The principal minerals are galena (lead, PbS) and sphalerite (zinc, ZnS) with lesser amounts of chalcopyrite (copper, CuFeS2). At the end of October 2005, ore reserves were approximately 34 million proven and probable tons at average grades of 6.23% lead, 1.36% zinc and 0.26% copper.
As of end October 2006, the company had six production shafts feeding four mills with a combined capacity of 21,000 metric tons per day which produced 255,600 metric tons of lead in concentrate plus zinc and copper byproducts. This was transported by public road to the primary lead smelter at Herculaneum, 56 km (35 mi) south of St Louis. It has a capacity of 227,000 metric tons of lead annually but is limited by permit to 181,500 metric tons. 2006 production was 140,300 metric tons of primary lead. The balance of the lead concentrates plus the zinc and copper concentrates were sold to other smelters One shaft, mill and smelter (Glover) were not in operation..
The recycling smelter at Boss, Missouri, handles old batteries, scrap lead and lead-bearing hazardous waste. It is permitted to produce 152,410 metric tons of lead annually and in 2005 produced only 123,800 metric tons of secondary lead due to a tight scrap market. Fabricated Products produces value-added lead products such as lead oxide, lead sheet and lead pipes at facilities in Arizona and Washington.
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