SMJRR.] 
ORES    OF    GOLDFIELD,    NEV. 
135 
pities.     Such  portions  are  apt  to  be  lenticular  or  irregular,  like  the 
main  quartz  reefs,  and  they  are  not  easily  distinguishable  from  the 
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/     X  ',    ' ,    I    s        .  —   1*1 
\,\  /s'/  v- 
l/  is  /•  *  /  V/i'- 
m&Mwwix^ti 
1  /  \ 
r/x'A" 
.->/J 
;  '*  ^ A-/  '  'r\»  \ivvVi  vVi\i  r. 
Scale  of  yards 
00  200 
300 
Pig.  9. — Types  of  quartz  bodies  at  Goldneld.     Horizontal  sections,  sketched  from  outcrops. 
Country  rock  is  andesite  or  rhyolite,  or  both. 
barren  quartz  except  by  panning  or  assaying;    but  these  shoots  arc 
Ihe  real  ore  deposits,  and  the  mass  of  the  reefs  constitutes  merely  a 
