32 Bulletin of the New York State Museum. 



vertically, running a north-west and south-east course. By reason of 

 irregularities in the course of the foot-w T all, the ore breadth varies 

 considerably, and the pinches are from a few feet to 75 feet long. 

 Generally, magnetite is found in scattered grains in the mass of rock, 

 both in the foot and in the hanging walls. The ore is all quite rich, 

 but varies in the texture. Much of it is rather fine-crystalline. On 

 account of its excellence and its value for Bessemer iron it is sought 

 after, and the mines are worked at a great depth, and on compara- 

 tively small veins. The ore is hoisted through the Roe shaft and Big 

 pit mainly. There is little water, excepting near the surface, and 

 that is collected in the upper levels and raised by small pumps. 

 There are two engine houses from which power for hoisting, pumping, 

 compressing air and the electric light are furnished, one near the Roe 

 shaft and the other, north-east of the Big pit. 



The chemical composition of New Bed ore is, according to an 

 analysis, from W. C. Witherbee : 



Metalliciron 68.97 



Oxygen with iron 26.29 



Lime.. 03 



Alumina _ _ _ 09 



Magnesia _ trace 



Silicious matter (insoluble) _ 4-. 23 



Phosphoric acid 082 



Water .26 



Undetermined and loss ._ _ 048 



100.000 



Metallic iron 68.97 



Phosphorus w __ 036 



BARTON HILL MINES.— Two slopes with their connected 

 workings and open pits on the outcrop, constitute the Barton Hill 

 mines. They are on the eastern side of the ridge, and within 200 

 feet, vertically, of the crest. The strike of the ore is north and the 

 dip to the west, at varying angles, due to the inequalities in the foot 

 and in the hanging wall. Hence the thickness varies greatly, in 

 places being pinched to a few inches ; in others broadening to five 

 and up to eighteen feet. At the north side of the north slope the ore 

 is found abutting against rock, as it were, a longitudinal fault, which 



