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.

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Authors, continuously from last report, have made clear up the effects of surfactants in O. A. method.
Especially in this report, they have discussed the relative merits of surfactant addition test in comparison with blank test, considering the relation between ash removal and several factors, for example mean size of coal, slurry density, quantity of binder oil, pelletizing temp., retention time and so on.

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