282 TRANSACTIONS OF THE ROYAL CANADIAN INSTITUTE  [VOL. XI 
has been insufficiently developed to supply the necessary tonnage. The 
mill consists, essentially, of a rock crusher, rolls, picking belts and screens, 
and has produced several tons of medium grade concentrate which it is 
understood are held at the property for future concentration. 
The Chisholm mine opened up as a rather promising prospect and 
was so considered until the property of the Canadian Wood Company 
at Quyon completely overshadowed it in the matter of quick produc- 
tion. The Chisholm mine is being operated by open cut and the manage- 
ment have installed a small roll and screen cobbing plant of sufficient 
capacity to treat 15 tons of ore in 10 hours. This cobbing plant was 
installed with a view of cobbing the run of mine which is in the neigh- 
bourhood of 1% up to a shipping product of 15% molybdenite or better; 
the intention being to send the cobbed mill product to the Testing 
Laboratories at Ottawa, where it will be milled to a commercial grade. 
The Renfrew Molybdenum Mines, Limited, are working a property 
on Mount St. Patrick about 11 miles from Ashdod Station on the King- 
ston and Pembroke railway. This mine is probably in a more advanced 
stage of development than any other molybdenite mine in Ontario. 
Some years ago the mine was opened up by an adit tunnel driven to 
intersect a hillside vein. The tunnel encountered the vein about 80 feet 
on the incline below the surface and proved the ore to exist at that depth 
and to contain about 1% molybdenite. In 1916, active work was 
commenced and we are informed that a shaft has been sunk on the vein 
to a depth of 75 feet at which point the vein has been found to persist 
in both width and molybdenite content. During the fall of 1916, a 
single unit Elmore Vacuum Flotation plant was installed at the property 
and milling operations were commenced some time in December. The 
management state that with the Elmore plant they are treating from 
30 to 40 tons daily and producing therefore 500 to 1,000 pounds of 80% 
concentrate. 
So far, the entire production of the Renfrew Molybdenum Mines, 
Limited, has been exported to France where this Company have a con- 
tract to fill with one of the Metallurgical Departments of the French 
Government. 
BRITISH COLUMBIA. 
While we have records of several promising Molybdenite prospects 
in British Columbia this Province has not—up to the present time— 
produced any merchantable concentrate, the western miner having 
contented himself with making shipments of crude ore. 
In the fall of 1916 the Canadian Munition Resources Commission 
engaged J. C. Gwillim, Professor of Mining Engineering, Queen’s 
