Abstract
Tetrahedrite grains which were taken from flotation products of Kosaka mine were analized for 7 elements such as Cu, Zn, Fe, Ag, Sb, As and S by EPMA. Afterwards, three facts are revealed as follows;
1) Tetrahedrite grains from tails of Cu-Pb cleaner flotation show relatively higher Ag contents than others.
2) After principal component analysis, the chemical difference between tetrahedrite grains of froth of Cu-Pb cleaner flotation and those of tails become very clear. But its meaning is still unknown.
3) All tetrahedrite grains show the regular relation in their chemical components.
