VALLEY VIEW VEIN SYSTEM. 



131 



Vein zone 



Vein zone 



Quartz veinlcts Quartz Quartz veinfets 



Scale 



s 10 feet 



FIG. 28. Sections showing the structure of the Valley View veins; o, altered andesite; 6, quartz. A, Detailed vertical 

 section of one of the minor Valley View veins at surface. B, Detailed vertical cross section of the same vein as 

 A, taken about 30 feet east of it. C, Detailed sketched cross section of the same vein as A and B taken about 70 

 feet east of S. D, Vertical sketched cross section of the same vein as A, B, and C, at the surface, taken at a point about 

 50 feet east of C. E, Detailed sketched vertical cross section of a fracture zone near Valley View shaft, at surface, 

 showing the nature of the fracture zone, which by replacement may form a solid quartz vein. Even the small stringers 

 shown here have unquestionably originated by replacement of the andesite along mere cracks. 





