93 
On a Method of Extracting Gold, woe and oceans 
Metals from Pyrites 
By W. A. Drxoy, F.C.S., Cor. Mem. Nat. Hist. Soc. Glasgow. 
[Read before the Royal Society of N.S.W., 1 August, 1877.] 
Some three a since, Mr. Wood, Under pec pers for Mi ines, 
suggested to me that the extraction of gold from complex 
minerals was a subject well worthy of nae and one 
which if brought to a successful issue would be of great value to 
metals, that none vo the o nay oe of treatifiont extract 
more than a very small proportion of 
ing on this suggestion, I obtained some pyrites from 
Meneses Reef, Gympie, which in the rough yielded on 
analysis 
‘Ce oc ee GB per cent. 
5 ee eee cee ‘19 
Gold... ... ... 802. 8 dwta 2 grs. per ton. 
Silver ... ... 32 oz. 9 dwts. 3 grs. per ton. 
Another oe sap from the same reef, after being ground 
and washed so as to remove as much as possible of the quartz, 
which was found to sect to about 60 per cent. of the rough 
mineral, gave— 
Copper .,. ... 17°02 or pone a woe wee 48°45 
Rig 00 nage: wae? DOR on op gest OO 
Antimon ver BO Gal ove ok 
at and silver .. “22 Sulphide of antimony - «=544 
Tro . .«» SLAL Sulphide ofarsenic ... ‘68 
Balpbur ... « 37°86 Gold and silver ae 
niet coer role esi: ace eae 
Arsenic and loss "42 
100-00 100°21 
Gold .., 12 oz. 10 dwts. 0 grs. 
Silver... 62 oz. 9 dwis. 16 crs, | Per ton. 
G 
