152 FieLp CoLuMBIAN MustumM—GEo_ocy, VOL. I. 
Granular blende and galena with coarsely crystalline calcite and 
an indeterminate chloritic gangue, form a vein three inches wide. 
Some chalcopyrite is present. 
‘¢231. Pyrite and galena, ore from the Condé mine.” 
‘¢232. [E 1105.] Pyriteand galena, ore from the Condé mine.” 
This is a quartz impregnated with small crystals of galena, 
pyrite and blende. Tuff is enclosed in the form of angular fragments 
and streaks where the replacement has been incomplete. 
‘¢233, Pyrite and galena, ore from the Condé mine.” 
‘©234. [FE 1106.| Black blende, ore from the Condé mine.” 
This is a fine granular blende with quartz. 
‘235. Molino ore from the Condé mine.”’ 
‘¢236. Blende and pyrite, ore from the Condé mine.” 
‘6237. [E 1107.] Yellow blende on feldspathic veinstuff from 
the Condé mine.” 
This is a yellow blende with some granules of quartz and pyrite 
on coarsely crystalline calcite. 
‘¢238. Yellow blende on calcite.”’ 
Caso] a sa0ne eo tnt teen 
Typical radiated black stibnite forms a pocket in rhyolite tuff. 
Around the edges of this pocket are hollows where radiating stibnite 
crystals have been dissolved. Kermesite is present as an alteration 
product. 
‘¢ 240,.))| 1108.4) souarteites: 
This proves to be a trachyte which is much altered and impreg- 
nated with pyrite and with small amygdules partially filled with cal- 
cite. In its present condition it contains, as determined by analysis 
by the writer, 57.4% silica. Before the impregnation with pyrite and 
calcite the amount must have been somewhat larger as there has been 
little or no silica added during the alteration and impregnation. 
‘©241. Colorado gold ore from the San Cayetano mine.” 
‘©242. Colorado gold ore from the San Cayetano mine.”’ 
‘©243. [E 1109.| Colorado gold ore from the San Cayetano 
mine,” 
‘‘244. Decomposed pyrites, gold ore from the San Cayetano 
mine.’’ 
‘‘245. Auriferous pyrites, ore from the San Cayetano mine.” 
‘246. Auriferous pyrites, ore from the San Cayetano mine.’’ 
‘¢247, Gold ore from the Zareimalito mine.” | 
‘248. Gold ore from the Zareimalito mine.”’ 
‘‘249. Gold ore from the Zareimalito mine.” 
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