SPURR.l 
ORE    DEPOSITS    OF    TONOPAH,   NEVADA. 
101 
die  out.     The  main  vein  and  its  branches  may  together  be  termed  a 
"vein  group." 
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 
North  Star  Shaft  a 
1  Tonopah  Extension  Shaft 
i  MacNamara  Shaft 
Montana  Tonopah  Shaft H 
Tonopah  Mining  Company 
a  Main  Shaft 
^zpah_Vein         - 
a  West  End  Shaft 
fraction  No.l  Shaft 
"Fraction  No. 2  Shaft 
Desert  Queen 
Shaft    a 
B  Silver  Top  Shaft 
a  Stone  Cabin  Shaft 
Valley  View 
Vein  Group 
a  Wandering  Boy  Shaft 
B  Fraction  No.5  Shaft 
a  Gold-Hill  Shaft 
a  Tonopah  City  Shaft 
300  200  100  0         300        600        900  FEET 
California 
-Tonopah 
5   Shaft 
Fig.  3.— Map  showing  outcropping  veins  at  Tonopah. 
that  have  been  sufficiently  developed  to  give  information  concerning 
the  vein  s}7stem.  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.  3). 
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- 
