SPUBB.] 
VEIN GROUPS. 
19 
die out. The main vein and its branches may together be termed a 
"vein group. 11 
Veins probably of the early andesite period have been discovered 
in various mines outside of Mizpah Hill, where the first discoveries 
were made. Among these later developments may be mentioned the 
California Tonopah, the MacNamara, the West End, the Ohio Tono- 
pah, and other workings. But it is only the veins on Mizpah Hill 
Nortb Star Shaft a 
s Tonopah Extension Shaft 
a MacNamara Shaft 
Montana Tonopah Shaft a 
Tonopah Mining Company 
a Main Shaft 
Mizpah Vein 
a West End Shaft 
H Eraction No.l Shaft 
"Fraction No. 2 Shaft 
' Desert Queen 
Shaft 
Mizpah 
Group 
Valley View 
a Silver Top Shaft 
a Stone Cabin Shaft 
Valley View 
Vein Group 
3 Wandering Boy Shaft 
B Fraction No.5 Shaft 
a Gold-Hill Shaft 
a Tonopah City Shaft 
300 200 100 
California 
-Tonopah 
3 Shaft 
Fig. 2.— Map showing outcropping veins at Tonopah. 
that have been sufficiently developed to give information concerning 
the vein system. On Mizpah Hill there may be recognized at present 
three main groups of veins — the Valley View group, the Mizpah group, 
and the Montana Tonopah group. These are all strong and distinct 
(fig. 2). 
The Mizpah group lies in the center, between the other two, and was 
the first discovered. The trunk vein of the group is called the ' ' Miz- 
