I 
MINING GEOLOGY 
95 
As the common sulphide of antimony, stibnite, the ore in the 
main is massive, but coarse-grained, and aside from the country 
rock fragments it contains very little foreign material. Large 
crystals of stibnite, with highly polished surfaces, also occur, that 
are as pure as any known. These, of course, are high in the metal 
content, and probably run about 70 per cent, the chemically pure 
product being 71.8 per cent. 
Assays made of fifteen samples taken from different parts of 
the workings gave an average result of over 36 per cent antimony. 
The special tests for the other metals were: Gold, none; silver, 
trace; antimony, 36.40; tin, none; copper, none; iron, 4.90; zinc, 
none; and-lead, none. The analyses indicate an ore of remarkable 
purity for the manufacture of antimony white, which is used so 
largely to give body to the coating of enamelware. This will be 
the chief use of the metal now that the amunition demands of the 
war are over. 
Keyes. 
