46 SILVER-LEAD DEPOSITS OF EUREKA, NEVADA. 



followed the southwestern branch of this drift, but in all probability it 

 widens out again in the manner shown on the map, as it is found at the south- 

 east on the first level of the Albion 30 feet above the Richmond sixth. It 

 there follows a course almost identical with that exposed above it on the 

 fourth. It seems to have the same bends and twists exhibited on that level, 

 and it is likely that its position at any intermediate point between the two 

 levels could be calculated within a few feet. Both in the Albion first and 

 in the Richmond fourth, 170 feet above it, the quartzite also comes in con- 

 tact with shale bodies, and the manner of occurrence in the two cases is 

 very similar. The quartzite on the Albion first is very narrow, and although 

 it lies along a well-defined fissure it is not an easy matter to obtain character- 

 istic specimens, as it is much mixed with limestone and clay. 



On the seventh level of the Richmond there is a fault 190 feet from the 

 shaft, but it lies over 200 feet to the southwest of the point at which its 

 position above would indicate its reappearance. The quartzite and its 

 accompanying fissure is found at the southeast end of the Albion second 

 or intermediate level. At this point it has been cross-cut ten feet and the 

 back limestone has not been encountered. In following along this level, 

 the fissure, which is here nearly perpendicular, leaves the quartzite. It is 

 true that this fissure contains more or less ckw and quartzite for a consid- 

 erable distance, but the limestone on the southwest side of it does not seem 

 to have the usual characteristics of the back limestone. In passing along 

 the eighth level a fault is again noticeable, at a point where there is a sharp 

 bend in the drift 390 feet west of the shaft. The point is nearly directly 

 below the fault on the sixth. 



As the seventh level does not extend far enough south to expose this 

 fault, were it in the position on that level indicated by its occurrence on the 

 sixth and eighth, it is impossible to tell whether the fault which is exposed 

 on the seventh, 190 feet from the shaft, is the same as the one on the sixth 

 and eighth. It possibly is another fault, but those exposed on the sixth and 

 eighth must be identical. Shortly after leaving this point nothing inure i> 

 to be seen of this quartzite on the eighth level until it is laid bare in the 

 south cross-cut west of this fault. It is here about 30 feet wide, and is 

 somewhat different in character from the ordinary quartzite. It is grayish 



