A Zinc-lead-zinc ore dressing plant in Sweden with the daily output of 1000t, Zinc content of 0.58 , lead content of 2.85 and zinc content 4.90 Xinhai adopted Zinc-lead mixed flotation. Final Zinc concentrate contains Zinc 20.25 and lead 6.75 , and the lead concentrate contains lead 58.73 and Zinc.Mar 30, 2020 Near the mines in which zinc ore is extracted in underground or open-cast operations, some plants enrich the zinc content of the ore (5 to 15 ) to about 55 in so-called concentrates. The separated rock with low zinc content remains in place.