Occnrrence of Silver in Donggangshan Ag-polymetallic Deposit

There are 3 types of Ag-polymetallic deposits in Donggangshan area in which the most important one is the cassiterite-Ag sulfide deposit.The mineralization of silver is at the late stage of formation of sulfides,i.e.,the stage of the formation of boulangerite-galena-chalcopyrite-Ag-tetrahedrite.Silver has 3 kinds of Occur-rances in the ore:1)in independant mineral phase,Ag-tetrahedrite,in main ore minerals; 2)in isomorphic state but the possibility of its existance in submicrocrystals of tetrahedrite may not be excluded;3)in secondary argen-tite in the lower part of oxidized zone.