AP42 12.18 Leadbearing Ore Crushing and Grinding
2021-6-25 · After extraction, the ore is processed by crushing, screening, and milling. Domestic lead mine production for 1991 totaled 480,000 megagrams (Mg) (530,000 tons) of lead in ore concentrates, a decrease of some 15,000 Mg (16,500 tons) from 1990 production. Except for mines in Missouri, lead ore is closely interrelated with zinc and silver. Lead ores
