1916] TREATMENT OF MOLYBDENUM ORES IN CANADA 285 
‘‘A” through the machine into tanks ‘“‘G”’ and ‘‘H’’. Provided that a 
continuous flow of pulp is supplied, a continuous and entirely automatic 
discharge of tailing and concentrate is secured. The annular space 
‘“K”’ is provided with a thick glass window through which the operation 
of the machine may be observed. 
The apparatus is supplied in single units that are said to have a 
capacity of from 25 to 50 tons of crude per 24 hours, depending upon 
the nature of the ore. 
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1 PULP FROM MILL 
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Section of Elmore Vacuum Concentrator 
MINERALS SEPARATOR PROCESS—-HOOVER VALVELESS APPARATUS. 
This machine is illustrated in Figure 2 which shows a plan and 
section of the apparatus. The ore with its additions of oil and acid is 
fed into ‘‘A”’ where it is agitated for a time and emerges at the opening 
‘““B”’ into box ‘‘C”’. Any sulphide that floats in box ‘‘C”’ is removed 
at its lip ‘‘D’’. The bulk of the pulp is then drawn through port ‘‘E” 
into the mixer ‘‘F’’, whence, after further agitation, it is discharged 
from port ‘‘G’’ into box ‘‘H”’ where more flotary sulphide is removed at 
lip ‘‘I’”’ and so on continuously throughout the series, alternately agitat- 
ing and delivering sulphide froth until the last frothing-box “ J’’, where 
