1916] TREATMENT OF MOLYBDENUM ORES IN CANADA 279 
advertised their willingness to treat small parcels of ore originating 
from other localities and while no other mines of the magnitude of the 
‘“Moss’’ have been encountered to date, the Department received 
during the year about 217 tons from other sources. 
The method first adopted for the purchase and settlement of these 
ores was as follows: 
The miner was required to deliver his ore carriage paid to the Testing 
Laboratories of the Department, and after the ore had been milled he 
was to receive the proceeds from the sale of his molybdenite at approxi- 
mately $1.09 per pound of MoS: f.o.b., Ottawa, less the cost of con- 
centration—between $5.00 and $6.00 a ton. No definite recovery was 
guaranteed... In December, 1916, it was found possible to standardize 
milling operations and to fix a definite cost per ton for the ore treated 
together with definite schedule of guaranteed recovery of molybdenite. 
This schedule is as follows: 
Terms of Purchase of Molybdenite Ores, Department of Mines, Ottawa. 
(1) On assay returns from samples dried at 212° F. 
(2) For dry ores—moisture to be deducted. 
(3) The cost of concentration to be $5.65 per net ton. 
(4) The value of Molybdenite (MoS:) to be $1.00 per pound, Ottawa. 
(5) Payment to be calculated as follows per ton of 2,000 lbs. dry ore 
delivered on siding at Mines Branch Testing Laboratories, Ottawa: 
Molybdenite Ores containing: 
(a) Betweeno.5% and1% _ for 70% of the total Molybdenite (MoS) Content. 
(b) 1.1% and 1.5% for 78% 
(c) OY ESL ane OF, for 84%) \' it a q 
(d) aie 7 andes oO, for 87%, \.: ‘ oy i i 
(e) “ 2.51% and 3.0% for 90% “ aN ‘ ai ri 
(f) Nae AanEN YN LOM G27.) *\ s i: Us 
(6) Net returns to the miner will be the value of the ore calculated 
as indicated above less $5.65 per net ton concentration charges. 
The Departmental Plant has operated since June, 1916, and up to 
the first of February, 1917, has treated 2,397 tons of crude ore and 
picked flake with the production of 34.85 tons of pure molybdenite in 
the form of a concentrate averaging 80% MoS. The ore treated con- 
tained 1.84% molybdenite and the actual molybdenite shipped has 
been 79.09% of the total amount received. The total recovery would 
be slightly over 80% as no account has been taken in this calculation 
of the several tons of middling product in process of milling. 
THE INTERNATIONAL MOLYBDENUM COMPANY OF ORILLIA. 
The International Molybdenum Company of Orillia, Ontario, with 
concentrating mill at Renfrew and smelter at Orillia, have been in opera- 
