MAGNETITE AND PYRITE. 



121 



is really a bed of gneiss very rich in magnetite, rich enough in 

 places to afford a merchantable ore. The greater part of it, how- 

 ever, requires concentration. It is known for several miles on the 

 outcrop. On either side the ore shades out into the walls of bar- 

 ren rock. The Little River mines on the west side, in St. Law- 



FIG. 26. View of open cut and underground work in Mine 21, Mineville, 

 near Port Henry, N. Y. Photographed by J. F, Kemp, 1892. 



rence County, appear to be a similar but larger bed or group of 

 beds of lean ore, said to be from 800 to J500 feet wide and t\vo 

 miles long. The Barton Hill mines, near Mineville, are openings on 

 a single connected zone and extend, together with Fisher Hill, over 

 a mile on the strike. 



2.03.03. Besides these extended beds there are otner deposits 



