514 MINmG lEDUSTEY. 



Mining Company. The same company own other claims on the same lode, one 

 of them 200 feet in length, about 1,200 feet farther west, between the Narra- 

 gansett mine and the Mammoth lode ; the other 250 feet in length, about 1,000 

 feet further east, on the eastern extension. They also own, as already stated, 

 76 feet on the Bobtail, now lying idle, besides some less developed property 

 in the region ; but their M^ork at present is concentrated on the 300 feet of 

 the Gregory first referred to. 



There are three shafts, one central and one near each end of the mine. 

 Of the two latter the westernmost has been abandoned, so that operations are 

 carried on only through the other two, which in August, 1869, had reached a 

 depth of 576 and 531 feet. In the northeastern part of the mine the vein, at 

 a depth of about 300 feet below the surface, is divided into two branches, 

 which are generally considered, although the connection had not been actually 

 traced, as the same branches that in the claims further east are distinguished 

 as the Gregory crevice, on the northwest side, and the Briggs crevice, on the 

 southeast side. The line of junction of these branches appears to be between 

 the eastern and the central shafts, occurring, as has already been said in the fore- 

 going, further and further west as the depth increases. Thus, all the ground 

 in the upper portion of the mine and for the whole depth west of the central 

 shaft has been worked as one vein, while below a depth of 250 or 300 feet, in 

 the eastern portion, the two branches have been recognized. It should be 

 observed that in the eastern, lower portion of the mine, where the Briggs has 

 been chiefly worked, the Gregory is small, poor, and so far not worked. 



The general course of the Gregory or main crevice on this property is 

 north 45° to 47° east, true, while that of the Briggs, near its point of diver- 

 gence from the Gregory, is north 50° to 52° east. The dip of both branches 

 is southeasterly, though not deviating far from the vertical. The average 

 width is three or four feet, though in the western part of the mine, where appear- 

 ing as one crevice only, it expands in places to twelve or fifteen feet. The pay- 

 ground, as already shown, consists usually of a solid seam of pyrites, with a 

 course of vein-matter impregnated with the same. The compact seam is fre- 

 quently two or three feet wide. The whole of the vein-matter is usually 

 taken out and crushed together in the stamping mill, yielding, it is said, from 

 $20 to $25 per ton, in coin. The bottom of the mine, where accessible, was 



