1904-5.]| THE CHEMICAL INDUSTRIES OF THE DOMINION. 161 
it and obtained the rights (1896) for Ontario to the Sulman-Tweed patents 
(bromo-cyanide process), working it with only a modified degree of success 
for a couple of years, when the installation of improved machinery and the 
adoption of a combination of amalgamation and leaching with bromo- 
cyanide resulted in the recovery of arsenic from the mispickel concentrates. 
To accomplish this the concentrates are heated to a high temperature in 
specially constructed cylindrical revolving calciners, and the resulting im- 
pure arsenious oxide evolved is condensed in hermetically sealed brick 
chambers.”° The crude arsenic is refined by sublimation, and contains from 
99.6 to 100 per cent. arsenious oxide, the main impurity being silica in a 
finely divided condition.*4_ It is exported chiefly to the United States, 
where it is used for making ‘‘Paris Green,’ etc. The output has increased 
from 113,477 pounds in 1899 to 1,347,000 pounds in rgo1.”!' In time and 
with proper development Ontario should be able to supply the entire de- 
mand for arsenic on the continent of America. 
Auriferous mispickel mines are being opened up at Lake Temagami, 
and concentrating works are in course of erection. The process of refining 
the arsenic will be an electrical one. The ores of the Haileybury region, 
not far distant, discovered last year, contain 60 or 65 per cent. of arsenic, 
but are more valuable for their other constituents, including silver, cobalt 
and nickel.!9 bis. 
ANTIMONY. 
This metal might almost be said to occupy the position of a bye- 
product in the extraction of gold. At Rawdon, in Nova Scotia, the ore 
(stibnite) is auriferous, and from 1898 to rgor no refined antimony was 
produced, the stibnite being mined for the sake of its more precious con- 
tents”. It is also found in Quebec, and recent reports indicate deposits 
of ore in several localities of Ontario and British Columbia. The output in 
1891 had fallen to $60. In 1902 the refining of the metal was renewed. 
GOLD. 
Gold is mined to a small extent in Ontario, in Nova Scotia and Quebec. 
Gold deposits are also found in the Kootenay district, B.C., in Cariboo, B.C., 
and in the Yukon. In the Rossland district the ore is a cupriferous pyrr- 
hotite under a diorite cap, and from Trail on the Columbia River, where the 
(20) C. Kirkegaard, in Eng. and Mining J., Jan. 31, 1903. 
(21) Bureau of Mines Report, Ontario, 1901. 
(22) Assays of two ores give, according to the Nova Scotia Mines Report, 1901:— 
I 
} Per cent. Per cent. 
PASTATUT ITN OMA Ysera as oe NCEE R ASIC e fe OCTET cor TIE RET GA Bap be Ve 45.75 18.21 
Gola(ozs. per tom): Hasse: ieee OR ee ae eee ee ee ae 2.48 0.23 
Silviert(Ozspenibonm) itv icc aces chee ERE ne ee 0.10 0.13 
