FRACTION NO. 2 WORKINGS. 



147 



other mines of the district, has a dull purplish color, due to the presence of fine 

 silver sulphide. Most of the quartz discovered, however, has proved to be of low 

 grade. Adularia (valencianite) is very abundant as a gangue material. 



FRACTION NO. 2 WORKINGS. 



ROCKS EXPOSED IX SHAFT. 



The Fraction No. 2 shaft, which was sunk after the No. 1 shaft and became 

 the main working shaft, lies about 450 feet west-southwest of the No. 1 shaft and 

 is connected with it at the 400-foot level. The collar is slightly higher than that 

 of the No. 1 shaft, and the geologic section exposed is about the same. The shaft 

 passed through about 215 feet of soft dacite and about 8 feet of white breccia 

 (consisting in large part of rhyolite resembling the Oddie rhyolite) into the 

 earlier andesite. The contact of the overlying rocks with the earlier andesite 

 dips to the east at an angle of about 30, but this dip is probably only local. 



Scale 



Fraction No.2 shaft 

 300-ft. level 



FIG. 40. Horizontal plan of veins and faults exposed on the 300-foot level, Fraction workings, showing the relation of 

 the vein fragment in the Fraction No. 2 to the vein on the corresponding level of Fraction No. 1. 



FAULTED VEIN FRAGMENT. 



At about 300 feet from the shaft a body of quartz was drifted on for a short 

 distance to the southwest. This quartz is a definite vein about 3 feet thick. It 

 strikes northeast and dips southeast at an angle of about 40. Some good assays 

 were obtained from it, although most of it was very low grade. On the north- 

 west side of the shaft this vein seems to be cut off by a flat fault that strikes a 

 little west of north and dips at a slight angle to the east. It is very likely that 

 this vein, which has not been very largely explored, may be part of the same 

 vein which is exposed in the Fraction No. 1 workings, although a plotting of the 

 vein on the corresponding levels in the No. 1 and No. 2 workings shows how 

 difficult it is to establish any definite connection (fig. 40). Only the size and 



