472 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
working the mine to cross the main drift close to the granite-breccia contact, about 
150 feet southwest of the shaft. No work, however, has been done on the supposed 
Bobtail on these levels, and it is probable that the Bobtail lode, elsewhere unusually 
regular and persistent, instead of turning practically vertical, maintains its charac¬ 
teristic southwest dip and passes into the granite, as in the Portland mine. If so, 
it may be represented on level 10 by a strong fissure, dipping southwest, which is 
cut in the main drift 250 feet south of the shaft crosscut. 
Southwest of the Bobtail is the Cross lode, striking northwest, and cut by the 
main drift on level 5 about 300 feet south of the shaft. If the fissure zones known 
on the different levels as the Cross vein are really all portions of the same lode, 
that lode exhibits rather notable changes in dip. Between levels 5 and 6 it is vertical 
Between levels 6 and 7 it dips about 75° NE., while between levels 9 and 10 the dip 
is about 65° SW. As there are no continuous stopes on the Cross lode below level 
6 it is not improbable that different fissures, having generally a common northwest 
strike, have been erroneously identified as the Cross lode. It frequently occurs in 
this part of the district that a narrow sheeted zone in granite, after being followed 
for a few hundred feet, becomes very indistinct, while a neighboring fissure zone of 
approximately parallel strike becomes correspondingly more regular and conspic¬ 
uous. On level 5 the Cross vein apparently has no continuation northwest of the 
Granite lode. On level 6, however, a small northwest fissure zone runs off from 
the west side of the Granite lode about 40 feet north of the point where the Cross 
lode comes in on the east side. It is not clear whether the Cross lode follows the 
Granite lode for 40 feet before resuming its northwest course or whether the two 
northwest sheeted zones are really distinct. It is not likely that the offset of 40 
feet is due to faulting of the Cross by the Granite lode, for the latter zone of sheeting 
does not perceptibly fault the granite-breccia contact just north of this point. On 
level 7 the Cross lode is known only on the east side of the Granite lode, and ^n level 
8 it does not appear to have been recognized. On levels 9 and 10 the Cross lode is 
fairly distinct and extends across both the Granite and the West lodes. These facts 
lend additional support to the view that the Cross vein, so called, above level 7 is 
not identical with the Cross lode of levels 9 and 10. 
There is still a third northwest sheeted zone which has been followed on level G 
in a drift north of the shaft and 40 feet northeast of the Bobtail. It dips 70° SW. 
GEOLOGICAL FEATURES. 
While the Granite mine is chiefly in the familiar porphyritic granite exposed 
about Victor, the north end of the mine, including the entire shaft, is in breccia. 
The granite-breccia contact is cut in the main drift at distances ranging from 120 
to 225 feet south from the shaft. The rocks for several feet on each side of the 
contact are usually rather decomposed and show considerable oxidation, even on 
level 10. The general strike of the contact seems to vary from northwest to west, 
but, as there are no drifts on it, this point can not be accurately determined. The 
general dip is northerly, at about 80°. The contact surface, however, is evidently 
very irregular, and there may be local southerly dips between levels 6 and 7 and 
between levels 9 and 10. 
