284 TRANSACTIONS OF THE ROYAL CANADIAN INSTITUTE. [VOL. XI 
understood that the ore contained on the average 1.25% of molybdenite, 
but unfortunately owing to the extremely fine crystallization of the 
molybdenite the International Company have been unable up to the 
present time to attempt the milling of this shipment. 
A third property which may develop into a producer is a prospect 
called the Index mine situated between Cayuse and Cottonwood Creeks, 
Lillooet Mining Division. This property was worked for a short time 
during the fall of 1916 by Mr. Newton W. Emmens, of Vancouver, who 
made a shipment of 8 tons of high grade ore to the concentrator of the 
International Molybdenum Co. at Renfrew, Ontario. 
Other properties mentioned by Professor Gwillim as being worthy of 
some attention are as follows: 
Stave Lake—7 miles north of Stave Lake on Stump River, owned by 
Moses Bouchier, Mission, B.C. 
Pitt River—t1o miles from the north end of Pitt Lake, owned by A. 
Hewitt, Vancouver. 
Grande Prairie—20 miles south of Ducks, owned by C. A. Mackay, 
Adelphi, Post Office. 
THE ELMORE VACUUM FLOTATION PROCESS. 
The apparatus is illustrated diagrammatically in Figure 1, and its 
operation may be briefly described as follows: The crushed ore from 
the pulvérizing mill flows continuously into the mixer ‘‘A”’, into which 
are introduced small quantities of oil (in the separation of molybdenite 
the oil used is preferably kerosene) and if required, of acid also, at 
point “B’’. The pulp with its addition of oil is beaten to an emulsion 
in the mixer by the rotation of the agitator “‘C’’. The emulsion then 
flows from ‘“A”’ into the funnel ‘““D”’. The concentrate and tailing 
discharge pipes ‘‘E”’ and ‘‘F” are both sealed with water in the tanks 
“G” and ‘‘H”’, respectively. The feed pipe from “‘D”’ enters the centre 
of the vacuum or separating chamber ‘“‘I’’. By regulating the flow of 
pulp down tailing pipe ‘‘ F’’ so as to be less the up flow through feed-pipe 
“D”’, a small quantity of liquid is induced to overflow the annular lip 
“K” and to carry with it the floating concentrate down the concentrate 
pipe ‘““E”’ into tank ‘‘G’’. The series of rakes ‘‘L’’ are rotated by means 
of the gear drive at ‘‘M’’, and these rake blades are set at sufficient 
angle to cause the gangue in the pulp to move from the centre of the 
chamber “‘I”’ toward its periphery and to discharge continuously down 
the tailing pipe ‘‘F”’ into tank ‘‘H’’. The feed pipe ‘‘D”’ is usually 
25 to 30 feet long with the concentrate and tailing pipes ‘‘Z’’ and ‘‘F”’ 
made a few feet longer so that the pulp is syphoned from the mixer 
