THE COMSTOCK LODE. 59 



now the only supply of the Gould and Curry is the formerly rejected por- 

 tions of this body. The horse material enters the body of red quartz in two 

 wedge-like smasses, closely resembling in form those of the section through the 

 Potosi shaft. 



It is instructive to compare these two sections. In each the red body 

 follows the west wall, and toward the surface thrusts up a central spur, out- 

 cropping in the middle of the vein. Following the western wall to the sur- 

 face is a lesser spur, which, in the Grould and Curry, branches from the large 

 mass just below the Mount Davidson adit. In the Chollar-Potosi, as already 

 shown, the eastern is the larger and ore-favored sheet; in the Gould and Curry 

 on the contrary, the central mass largely predominates, and contains all the ore. 

 From the South Chollar ground to the North Gould and Curry, is an elliptical 

 chamber, widening in the middle, as was shown on the Atlas- Plate 11, to 900 

 feet. It will be seen that in this great central chamber of the Comstock the 

 quartz has made its appearance in two sheets, occupying positions successively 

 lower and eastward; following the east wall for a certain depth, and then 

 diverging in a more vertical course, to be replaced by new east bodies, which 

 in turn fork downward into the vein. The southern half of the eastern curve 

 of the east wall is about in the plane of the long fissure from the Bullion to 

 the North Chollar line. The quartz has a tendency, throughout the whole 

 curve, to swing from the east to the west wall, undoubtedly given by the 

 underlying syenite, which in the north part of the chamber juts boldly to the 



CRSu* 



Atlas-Plate 11 consists of two horizontal sections of the Virginia cham- 

 ber: first, on the level of the North Potosi tunnel, 331 feet below the datum- 

 point; secondly, on the plane of the Savage second station, 625 feet below the 

 datum-point. Both these sections are on levels which are remarkably well 

 known. It would also have been difficult to choose two planes where more 

 interesting conditions could be exposed. In the first is seen the two Chollar- 

 Potosi quartz-masses, together with their included propylite horse, curving 

 over to the west wall, where, against the right angle of syenite, they eventually 

 cease. The Savage-Gould-and-Curry quartz sheet is also seen to part, its larger 

 mass traversing the middle of the lode and ending, like those of the Potosi, 

 in a mere plate upon the west waU. The second or lower section is chiefly 



