32 



Mount Hope Mine, about a quarter of a mile from the former, 

 and upon the same hne of metalliferous injections. Its position is 

 upon the northeastern brow of a hill, about three hundred feet in 

 elevation, overlooking the old Mount Hope Furnace. The quality 

 of the ore appears to be analogous to that of the Mount Hope 

 Blue Mine. The thickness of the vein varies, being only one foot 

 at the south end of the mine, and six feet at the north end. 

 A shaft has been sunk here between seventy and eighty feet in 

 depth. This mine is now in operation. 



About one-fourth of a mile to the southwest of the last occurs 

 the Teaho Mine, on the southwestern declivity of the same hill. 

 Here the vein of ore is almost ten feet in thickness, holding a 

 nearly vertical position, its inclination being towards the south- 

 east. The walls are regular and unbroken, consisting of a 

 rather micaceous gneiss. This is one of the veins in which the 

 horizontal columnar structure of the ore is very obviously dis- 

 played. A wedge of rock separates the vein in one or two 

 places, but only for a short distance. The ore is of excel- 

 lent quality, though compact, the foreign matter mingled with 

 the magnetic oxide of iron consisting of a green hornblende and 

 some quartz. The mine is about one hundred feet in depth, the 

 length of the excavation exceeding one hundred and fifty feet. 



Upon the same supposed northwestern vein or bell of ore, and 

 one mile further to the southwest, is the Mount Pleasant Mine. 

 The average thickness of the vein may be given at about eight 

 feet, though it is very variable, changing from eighteen inches to 

 twelve feet, and sometimes thinning away, for a short space, 

 almost to nothing. These fluctuations of width take place as 

 well in the vertical as in the horizontal direction. The rock 

 immediately adjacent to the ore, from all appearance protruded 

 contemporaneously with it, is an almost pure hornblende, 

 having an extremely beautiful massive crystallization. The ma- 

 terial of the regular wall, on the one side, is a hard, light- 

 coloured felspathic rock, while that of the other, or hanging 

 wall, is chloritic and often micaceous. In driving to the south- 

 west in one of the galleries of this mine, the progress of the vein 

 was suddenly arrested by a cross dike of (juartz rock, fourteen 

 feet in thickness. After many fruitless borings for the recovery 

 of the vein, it was discovered, heaved to the southeast, many feet 



