THE MINING AND QUARRY INDUSTRY I9QI2 99 
crushing machinery, so that the crushing and grinding can be con- 
ducted in separate rooms, a great factor in relieving the dusty con- 
ditions that are often very objectionable if not unhealthful. 
The International Pulp Co., whose activity in former years was 
divided among a large number of mining and milling properties 
secured by repeated consolidations and by leaseholds, has concen- 
trated attention recently upon a few which are more advantageously 
situated. The principal mines now worked are No. 2% and No. 3 
at Talcville, and the Wight mine near Sylvia lake. The operation 
of No. 3 mine was hampered during the last year by the loss of the 
water power plant at Talcville, but a new steam plant has been 
installed. The mine is one of the largest in the whole district, 
having a depth of about 500 feet on the incline and a system of 
levels which extends nearly double that distance along the strike. 
The working thickness of the body ranges from 15 to 40 feet. The. 
Taleville mill was burned down with the power plant and only 
No. 6 and the Columbia mill were steadily operated. 
The Ontario Talc Co., with mine and mill near Fullerville, was 
a steady producer. 
The new developments in tale mining at Natural Bridge have 
been attended with much interest as the first important under- 
taking of the kind outside of the Gouverneur district. The property 
began regular shipments of talc with the completion of the mill last 
season; and the initial operations are reported to have been very 
successful, as the product proved well adapted for paper manu- 
facture. The St Lawrence Talc Co., Inc., the owner, has already 
begun the enlargement of its milling capacity and continued the 
development of the mine. The talc from this section, as has been 
already mentioned in earlier reports, differs from the characteristic 
Gouverneur product which for the most part is of fibrous nature 
with subordinate amounts of foliated or scaly talc. The material 
at Natural Bridge, however, has a massive appearance, or at most 
shows an indistinctly granular habit, and is really a complex of 
alteration products. The color is prevailingly grayish, but there is 
also more or less of a greenish waxy. substance intermingled with 
the gray talcose minerals. The green comes in part from serpentine, 
but mostly is referable to a chloritic mineral which has a compact 
massive appearance, lacking the cleavage that characterizes ordinary 
chlorite. Chemical analysis confirms the presence of such a mineral 
which may be identical with the variety called pseudophite. The 
apparently massive talc resolves itself under the microscope into 
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