24 



in it, throughout a length of nearly three miles. That to the 

 northwest is distant from the former about two hundred feet, 

 and, where it has been traced or mined, has been found to pre- 

 serve a parallel direction with it. The first mentioned of these 

 veins extends to within a quarter of a mile of the New York line. 

 Their course is north northeast and south southwest. The rock 

 of this region, containing these veins, is the ordinary granitoid 

 gneiss, abounding in hornblende, and nearly destitute of mica. 

 It has a steep dip to the southeast. 



Following the most southeastern of these two veins, from the 

 southwest to the northeast, the first considerable excavation 

 which displays its structure is an old mine, quarried open to the 

 day, to the depth of perhaps forty feet, and for about three hun- 

 dred and fifty feet along the vein. The pitch of the vein at this 

 point is nearly vertical. Its general regularity is somewhat 

 disturbed by trivial slides and sudden changes of dip. Large 

 wedge-shaped masses of the gneiss rock of the walls intrude 

 themselves into the middle of the ore, subdividing the veins into 

 two or more branches, which send ofl' parallel filaments, that 

 either dwindle out entirely in the rock, or reunite with the main 

 body of the vein. 



The mean thickness of the ore in this mine is about ten or 

 twelve feet, exclusive of these interposed masses of rock. Though 

 not at present used, the ore is stated to be of average purity. 



About one hundred feet to the northeast of this is the mine 

 known as the Blue Mine, from the bluish hue of the ore. The 

 excavation from which the ore has been removed, is about one 

 hundred feet in length by fifty feet in depth, while the width of 

 the vein varies from six to fifteen feet. 



At this place also the vein is divided in the middle of the ore 

 by a vertical w^edge of rock, which increases from one to five 

 feet in thickness, and consists on the one side of red felspar, like 

 the adjacent wall of the vein, and on the other of compact green 

 sahlite. In this part of the vein are several oblique dislocations 

 or slides, always declining to the southeast. 



Within less than half a mile to the northeast of this last open- 

 ing there is another point where excavations have been made, 

 called the Mule Mine. The principal vein of ore here is seven 

 or eight feet thick, swelling out at some spots to twenty feet. 



