280 TRANSACTIONS OF THE ROYAL CANADIAN INSTITUTE. [VOL. XI 
tion since 1915. During the past year this company have milled ap- 
proximately 2,419 tons of molybdenite ores of which approximately 
26 tons were derived from the United States. According to figures 
supplied by the management of the company, the average content of 
the ore milled was 1.23% MoS: with a production of approximately 
60,000 pounds of molybdenite. The recovery has been estimated to be 
80% of the total amount of molybdenite received. 
This company are under contract with the Imperial Munitions 
Board for 50 tons of ferro-molybdenum of which they have already 
delivered in the neighbourhood of 30 tons. The ferro-molybdenum 
must comply with the following specification: 
Miolytcenaminii es Chea at eee ee 70% minimum. 
Gove AEM Wd A AL I td eR doe A 4% maximum. 
Reve palate: PR er As PR ES Hy ee 0.4% maximum. 
The alloy must be arsenic and copper-free. 
The International Company manufacture their ferro at Orillia from 
commercial molybdie acid produced in their chemical plant. The 
concentrate required as raw material is supplied partly from their own 
concentrator at Renfrew and partly by the Imperial Munitions Board 
at Ottawa. The ferro alloy produced by the International Company 
has been found entirely satisfactory as regards analyses, and is sold to 
the Imperial Munitions Board at a price of $3.25 per ton of contained 
molybdenum, delivered f.o.b., Montreal. Therefore, a ton of 2,000 
pounds of ferro-molybdenum containing exactly 70% Mo., is worth 
$4,550. The ferro-molybdenum is shipped to the Testing Laboratories 
of the Department of Mines at Ottawa where it is crushed, sampled, 
assayed and repacked for shipment to Europe by the Mines Branch 
officials; and it may be of interest to note that the weighing and analytical 
work of the Mines Branch has to date proved so satisfactory that the 
weights and assays determined by the Department are final and binding 
on both parties to the contract. The International Company control 
two molybdenite mines, the O’Brien, situated on Mount St. Patrick, 
Renfrew County, Ontario, and the ‘‘Molly’’ mine at Salmo, Sheep 
Creek, B.C. These two properties, however, are insufficiently developed 
to meet the capacity of the concentrating mill at Renfrew and the 
Company have treated a considerable tonnage of customs ore during the 
year. 
The method of concentration adopted by the International Molyb- 
denum Company is water film flotation, but the machine developed 
by the Company staff is somewhat differently constructed than either 
the Wood Machine or the apparatus developed by the Department of 
Mines. The principles involved are, however, exactly similar, and 
