MAGNETIC OXIDE OF IRON. 19 



of the magnetic separating machine. With this previous preparation, it is considered one of 

 the best ores in this district. 



Cook Mine. This traverses a hill three miles northwest from Clintonville. There are here 

 two parallel veins, only four or five feet distant from each other ; the one of which is not more 

 than two feet wide ; the other, more recently discovered, is thirteen feet wide. There are also 

 three other veins, parallel with the last, one six feet wide, 'another three, and another two feet. 

 The ore is black, sometimes gi-anular and soft ; at others, compact, or in firm masses. It is 

 strongly attracted by the magnet, and possesses polarity. The gangue of the ore is quartz, 

 black mica and hornblende, and these are so intimately mixed with the ore as to require their 

 separation by washing, or by the magnetic machine. It then yields iron of an excellent 

 quality.* 



Baltic Mine. This, although a mile and a half from the Cook Mine, is to be consideretl as 

 a part of the same deposit, the connexion being traceable by surface ore. Several openings 

 have been made in the immediate vicinity of each other, and there is probably a large quantity 

 of ore. It is, however, more or less mixed with iron pyrites. The gangue is entirely similar 

 to that of the preceding. 



Rutgers Mine. This is situated about eight miles west of Clintonville, in one of the primary 

 ranges. The vein is about ten feet wide, and the gangue or mineral matter associated with 

 the ore is said to be peculiar, and is thought by Dr. Emmons to be new. The course ot this 

 vein is parallel with that of the Arnold and Cook veins ; but as the ore does not yield so good 

 an iron as some others, it is not at present worked. 



Winter Mine. This has been thought to differ in its character from the other deposits of 

 ore in this district, as it appears like a thick plate covering several square rods of the rock 

 with which it is associated, or, as Dr. Emmons expresses it, as if it was deposited horizon- 

 tally on the rock, like an overflowing melted mass of lava. This gentleman states, however, 

 that it presents no appearances which, in reality, differ from those attending the ordinary veins. 

 The layer or mass of ore just noticed, is about one hundred feet in length by forty in 

 breadth, and two or three feet in thickness. This was found to be underlaid by masses of 

 lean ore, exhibiting the parallel bands or stripes which characterize other veins. The deposit 

 is every where traversed by transverse dykes ; and since the removal of the rich superficial 

 mass of ore, there does not seem to be much inducement for working it. 



To those now described may be added the Mace, the Burt, the Jackson and the Mclntyre 

 veins, or mines, which occur in the same district, but which are probably of secondary im- 

 portance. 



The Skinner Mine, situated about tlu^ee miles north of the Saranac river, and about seven 

 miles from Cadyrille, is represented as an inexhaustible deposit of the richest magnetic ore. 

 It is coarsely granular, has a dull metallic lustre, and is but slightly magnetic. It yields a 

 tough and valuable iron.f The accompanying rock is a reddish gi-anite ; but the ore, according 



* Emmons. Ncw-Yorlt Geological Rfporls, 1840. 



I B. S. Roberts, in the Report of the Commissioners lo sur\'ey the route of the Ogdensburgh and Ohaniplain raihoad. Dont. 

 ments of the New- York Legislature, 1841. 



