AND OTHER METALS FROM PYRITES. _ 105 
tray, an and t the copper ext 
by "lute a are oe The dried residue weighed 21} ozs., 
ith some oxide of iron and a little carbonate 
of sce and carbon gave a brittle button weighing 5$ ozs. To 
remove the antimony, as being the most convenient for laboratory, 
use, this button was fused with carbonate of sodium and nitrate 
n, 
mate of sodium gave a button weighing 158-65 
cupel bottom was ground up and fused with sodium carbonate, 
and charcoal, when it gave a butten of lead weighing 2 oz 
The mother liquors from the sulphate of copper eis were 
evaporated to dryness (this evaporation was necessary in the 
when the oxides cath added and metallic copper rine ei whieh 
with a prill obtained on cane the slags Sea 
be on a large scale. ere are good working methods for 
smelting out the lead and antimony with the gold ; and silver, and 
for separating these metals, which I need not detail. 
agra of sulphate of iron extracted from the roasted pyrites 
the use of sulphurous acid would give on calcination more 
ro enough sulphuris acid to extract the oxide of copper formed, 
The average quantity of sulphate of iron obtained trom this ore 
was about one-half the weight of the sulphate of copper produced. 
To conclude, the yields obtained from 12 lbs., as compared 
with those shown by analysis and assay, were— 
Analysis. 
ik “aaa ‘02 per cent. re 5 per ehh: 
Lease ivcict ) i: ae 
Antimony... 39 _,, , Not recovered. 
Silver ......620zs. 9dwts.18grs. 61 ozs. 13 dwis. 22°7 gers. 
Gold: 25) 12 ozs. 10 dwts. 0 grs. 14 ozs. 11 dwts. 23°2 grs. 
