VALLKY VIEW VEIN SYHTEM. 137 



which is 120 feet deep. An easterly drift cuts the fault and passes into the earlier 

 andesite. On this drift are found the veins encountered in the Stone Cabin 

 workings (tig. 32). The chief vein here seems to run N. 50 to 70 E. and to 

 dip south at an angle of about 80. It is encountered, though in a broken-up 

 condition, just west of the fault, but it is undoubtedly cut off by this on the east. 

 To the southwest of this fault the vein lies in the Stone Cabin ground, and has 

 been developed by the workings on the 100-foot level of this mine for about 100 

 feet. Still farther southwest the vein comes again into the Silver Top ground, 

 and is followed southwest from the Stone Cabin ground for about 140 feet. At 

 somewhat over 100 feet southwest of the Stone Cabin ground the vein forks, 

 and at the end of the drifts both forks are cut off by a fault striking N. 22 

 W. and dipping eastward at an angle of 60. The vein is also developed by a 

 vertical winze HO feet in depth in the portion west of the Stone Cabin ground. 



THE STONE CABIN-SILVER TOP VEINS A PART OF THE VALLEY VIEW VEIN OROl'P. 



The second weaker and parallel vein noted in the Stone Cabin workings, to 

 the south of the main vein, appears also in the Silver Top workings, but has not 

 been developed. 



The probable equivalents of both of these veins, which are shown in the 

 Silver Top and Stone Cabin workings, can be recognized on the surface, almost 

 immediately above, at the east end of the outcrop of the Valley View veins, 

 where they have the same characteristics that are given for the corresponding 

 veins underground. Even the forking of the vein in the Silver Top west drift, 

 as described above, corresponds with a similar forking of the corresponding vein 

 at the surface. 



It is plain, then, that the veins in the Stone Cabin and the Silver Top belong 

 to the Valley View group; and that, as in the case of the Valley View mine, 

 this outcropping group resolves itself underground into a single strong and 

 persistent vein with parallel weaker veins. 



CORRELATION OF VEINS IN DIFFERENT MINES. 



If this is the case, why does the vein go down nearly vertically for a known 

 distance of 450 feet in the Stone Cabin and Silver Top, while in the Valley 

 View the vein dips north at an angle less than 45 for a known vertical depth 

 of 500 feet? 



Effects of the Valley View fault. In approaching this problem we confront 

 first the fact that underground the veins of the Stone Cabin and Silver Top 

 have not been followed westward beyond a certain point, and that the Valley View 

 has not been traced eastward beyond a certain point. The veins are clearly cut off 



