106 ON A METHOD OF EXTRACTING GOLD, SILVER, 
These numbers are very satisfactory; and, although it is 
scarcely to be expected that the results would be equally satis- 
factory working ona large scale, it seems more than probable 
that returns better than those by any other process would 
obtained. 
Whilst experimenting on the removal of copper from solution, 
I found that this could be conveniently done by filtering the 
slightly acid aciatibth through ground matt obtained from the 
same ore by simple melting. This method of separating — 
from solution may be of advantage in treating poor copper 0 
superabundant ts of P acid, would be Fg "N Scithe er of these 
containing more or less sulphide of copper; and by diene 
through a bed of this matt the solution of sulphate of ree 
cent. to 33 per cent., aaa therefore to cepper pyrites, 
which contains 34°6 per cent. of copper. cs om this residue 
refined or er could ey rads e in thres operatio 
This method of treatment, as well as ges one pation, a 
for the Seaton of the various metals, have in common with 
ordinary copper smelting the advantage. that no materials cies 
thou or iby the ore are required, with the exception of fuel, 
water, 
ore p: e lite: 
end the erushed ore ma = washed when any ny Sener 
contained in the quartz may be recovered by amalgamation, 
\ 
A Peer: 25200 Liha eal 
be TS, eae hae ae a Ree SF eae pra 
