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AND OTHER METALS FROM PYRITES. 97 
On assaying a portion of the residue, it was found to contain— 
Gold... .... 3 oz. 14 dwt. 8 grs. per ton. 
Silver...) ... SO on 18 dw 14pm _ 
A portion was gr Zap with mercury and sufficient water to 
make it of the sonicabeninb of thick cream, in which the mereury 
was well broken up for an hour, and afterwards carefully washed, 
‘the tailings being gone over as often as any mercury was fo und. 
This yielded— 
Gold ...l oz. Odwt. 5 grs. leaving 2 oz. 14 dwt. 3 grs. 
Silver...6 oz. 16 dwt. 10 grs.  ,, 33 0z. 2 dwt. dgrs, 
_ Another portion, shaken up with a solution of salt and pieces 
of iron to decompose the chloride of silver, and the residue 
ground up as before, yielded— 
Gold ... 1 oz. 1 dwt. V4 leaving 2 oz. 15 dwt. 8 grs. 
Silver... 34 oz. 3 dwt. 5 grs. , 5 oz. 15 dwt. 9 grs. 
These results showing that even after Ay almost complete 
removal of sulphur, or at all events what would be considered 
complete on the large scale, the ee ae of the gold present — 
was untouched by the mercury, I to examine the 
effect of chlorine, of which I a aoe following as typical 
results : 
A marten treated with chlorine gas exactly as above described 
7 sign recipitated— ielded 1 oz. , leaving 2 ozs. 14 dwts. 8 grs. 
iat beat ue was ee hur 
rtion mixed with brine and the same quantity of re- agents 
as above and otherwise rainy | paca yielded Page” 1 oz. 2 dwts, 
5 grs., pate 2 ozs. 12d y iagsee 
water containing } oz. a of se the solution 
acidified and treated with sulphureted hydrogen, gave— 
ozs. dwts. = 
Gold . ul vie ee. ee 
Silver .. , 22 «14> 19 
Roasted ‘lide vale coisa with hypochlorite of caleium 
and sulphuric acid as above gave—-gold 11 ozs. 15 dwts. 5 grs., 
“The — last results show that with vongend le pyrites the 
with hypochlorite and acid gives very oy ee are sults, and 
this ie a process rath aang troublesome ‘ipparatus it might 
be sometimes applied wit: 
