412 MINING INDUSTET. 



the town of Hamilton, 975 feet below; on the east a precipitous wall, 400 

 feet in height, descends to Pocotillo. The limestone strata, at the summit of 

 the hill, dip westerly, at an angle of 9° to 10°, and strike nearly north and 

 south. 



About 200 feet below the crest of the ridge, along the west slope, are 

 situated Bromide, Chloride, and Pogonip '^ flats." In structure they are simply 

 floors of distinctly bedded limestone, which, dipping at a gentle angle, from 7° 

 to 10°, to the west, have received the above designation. The flats are 

 separated from each other by well-marked, natural boundaries — walls of lime- 

 stone, from 12 to 20 feet in height. The three flats, taken together, are a 

 little more than a quarter of a mile in length, by 550 feet in width; at the 

 lower end they terminate abruptly in a cliif, from 150 to 200 feet in height; 

 below which the strata are much disturbed, and of a very irregular dip and 

 strike down to the bottom of Silver Canon. 



At the foot of the escarpment which forms the southern limit of Pogo- 

 nip, occurs the fracture and displacement of strata already mentioned. This 

 fracture extends entirely across the ridge, with a course approximately at a 

 right-angle to the axis of the main anticlinal fold. It contains the Eber- 

 hardt deposit, and caused the formation of the two small east and west canons, 

 heading near the Eberhardt mine, the one trending toward Applegarth and 

 the other toward Silver Canon. 



South of this fracture the formation becomes very irregular, having been 

 broken up by local faults, displacements, and sharp folds. Southeast of the 

 Eberhardt mine, upon the hill on which the Argyle mine is located, the 

 strata of the east side dip toward Applegarth Canon at an angle of 36° ; on 

 the opposite side they dip westerly at an angle of 58°. These westerly dip- 

 ping strata form the east wall of Mahogany Canon, dipping toward the caiion. 

 The strata upon the opposite side of the caiion are found dipping to the east. 



Upon Babylon Hill and the Base Metal Range we find the same lime- 

 stone formation, less disturbed, and more uniform in dip and strike. 



Babylon Hill rises above the town of Swansea, in bold, precipitous clifls. 

 The summit of the hill is broad, sloping gently toward the south and west, 

 until it overhangs Poyonix Canon, where it presents steep, rugged walls. At 

 the northern end of the Base Metal Range the strata strike at an angle of 20° 



