WEST OF CARBONATE FAULT. 429 



in the Iron fault, shows that the original ore deposition was prior to the 

 faulting, and that whatever ore is found on its plane was brought there 

 mechanically or is the result of secondary deposition. 



North of the Pendery and yEtna workings it was difficult to obtain 

 accurate information in regard to the underground structure of the lower 

 slopes of the hill, west of Carbonate fault. Many prospecting shafts have 

 been sunk, a few of which penetrated the porphyry to the underlying lime- 

 stone, but they had mostly been abandoned. The St. Mary's was the only 

 one which was accessible. From information obtained in this and by dili- 

 gent questioning of persons who had visited the others, it appears that the 

 limestone in this region probably falls off to the west in a series of irregular 

 steps or benches, which may be actual faults or sharp flexures. The result 

 is a probable dip to the westward, as indicated in a generalized form in 

 Sections F and G, the only break or fold which could be actually located 

 being that assumed as the northern continuation of the Pendery fault and 

 which was actually seen in the St. Mary's workings. This fault is supposed 

 to pass into an anticlinal fold in the northern half of the area mapped, as 

 will be explained below. 



In the lower part of the Yankee Doodle claim are several old prospect- 

 ing shafts, now abandoned. That marked on the map as the lower shaft is 

 said to have found limestone and ore at about fifteen feet, which was cut off 

 to the westward by a sudden break. The break was followed by an incline 

 seventy-five to one hundred feet farther, and work was then discontinued. 

 This break is evidently the continuation of the Carbonate fault. 



NORTHERN GROUP OF MINES. 



In the northern half of the area shown on the Carbonate Hill map, 

 another ore body parallel with that already described, but of much greater 

 dimensions, has been developed east of the line of Carbonate fault, and a 

 smaller, but very rich body, in somewhat peculiar relations, to the west of 

 this line. 



The first of these bodies extends northeastward from its outcrop in 

 the Crescent claim through the Catalpa, Evening Star, Morning Star, and 

 Waterloo claims, and probably beyond these into the ground of the Maid 



