42 Bulletin of the New York State Museum. 



Peroxide of iron ._ 49.98 



Protoxide of iron _ 22.49 



Oxide of manganese — .17 



Alumina _ 1.36 



Lime 4.04 



Magnesia _ 1.97 



Silica 18.44 



Phosphoric acid _ _ .06 



Sulphur .05 



Metallic iron 52.47 



Phosphorus ._ _ .029 



A new slope, between Nos. 2 and 3, at the west end of the line, is 

 to be the main hoisting way, and several of the slopes near it are to 

 be abandoned, thus increasing the efficiency of the working 

 power. 



The ore, as mined, is sorted into furnace and separating ore. The 

 latter is concentrated in the mill near the mines.* These works have 

 a capacity of 300 tons a day ; and, in 1888 the product of sepa- 

 rated ore amounted to 55,000 tons. This separated ore or concen- 

 trates averages sixty-five per cent, of metallic iron, and is used largely 

 at their furnaces at Standish and at Plattsburgh. The company has 

 another separating works at Standish, and a third near a lake north- 

 east of the mines. 



The mining plant here is of necessity extensive, and includes four 

 Dickson Manuf. Co.'s duplex winding engines with 20 drums ; 22 

 boilers with an aggrgate of 1,600-horse-power ; three large Rand and 

 one Clayton air compressors ; 70 power drills and 40 pumps of various 

 sizes. The main line of the Chateaugay railroad runs close to and 

 nearly a parallel course with the vein, and there are branch tracks to 

 all of the docks. 



The extent of this ore belt has been proven by boring three miles 

 to the north-east, where the Parkhurst shaft is in course of sinking, 

 and to the north, under the village, in bore holes 1,800 feet deep. 



The outcrop of ore at Chateaugay w T as discovered many years ago, 

 but no mining worthy of note was done until the railroad was extended 

 to the mines, from Dannemora, in 1879. The present owners, the 

 Chateaugay Ore and Iron Company, came into possession in May, 



* For a description of the mill see paper by Ferdinand S. Ruttmann in the Trans- 

 actions of the Am. Inst, of Mining Engineers, Vol. XVI., pp. 609-623. 



