نگاهی به ژئوشیمی کانسار انگوران، جنوب غرب زنجان

Angouran ore deposit is located in ۱۲۵ km of SW of Zanjan. During the tertiary, geothermal- hydrothermal volcanic activities caused extensive alterations in the Angouran ore deposit and major primary sulfide ores altered to oxide (carbonate) ores. Main sulfide minerals are sphalerite and galena and some pyrite and arsenopyrite, while main carbonate minerals are smithsonite, hemimorphite and cerussite. This ore deposit could be classified to nonsulfide supergene deposit as formed by direct replacement.

Average of zinc grade is ۲۸.۴۳ % and lead is ۴.۵۵ %. Grade of zinc in sulfide ore is ۳۸.۹۱ % and in carbonate ore is ۲۶.۴۹ %. Grade of lead in sulfide ore is ۲.۰۵ % and in carbonate ore is ۴.۹۵ %. Estimated resources of the ore deposit is more than ۱۵ Mt. Geochemical studies indicate that value of Pb, Mn, As and Sb in carbonate ore is more than sulfide ore; Inversely value of Zn, Hg, Ag and Cu decreases in carbonate ore.