300 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
GEOLOGICAL FEATURES. 
The Moon-Anchor workings are entirely within the breccia, the Midget workings 
are partly in breccia and partly in the fine-grained gray gneiss of this vicinity, and the 
Conundrum workings, which 
for the most part follow the 
Conundrum basic dike, are 
chiefly in gneiss. 
The contact between the 
gneiss and breccia is irregular, 
is often very poorly defined, 
and lias not been exposed in a 
sufficient number of places to 
fully establish its form and 
character. Near the Conun¬ 
drum incline the contact at 
the surface practically coin¬ 
cides with the Conundrum 
dike. It dips, however, at a 
somewhat lower angle to the 
east than does the dike, and 
on the lower levels of the Co¬ 
nundrum mine lies within the 
little-explored hanging wall of 
the lode. Thus on level 8 of 
the Midget, northeast of the 
shaft, the contact is about 35 
feet east of the Conundrum 
dike. On level 9 the Midget 
shaft is in gneiss, showing the 
contact to be here at least 90 
feet east of the dike, and indi¬ 
cating a decided local flatten¬ 
ing of the dip. North of the 
Conundrum incline the breccia 
seems to overlie the gneiss in 
such a manner as to indicate 
an unusually low inclination 
of the contact. This is shown 
by a northeast crosscut from 
level 6, which extends to a 
point 1,050 feet northeast of 
the portal of the Conundrum 
adit or 400 feet north-north¬ 
west of the Moon-Anchor 
shaft. This crosscut is all in gneiss, although a vertical line through its face would 
emerge at the surface in the breccia fully 700 feet from the nearest exposure of gneiss. 
Fig. 29.—Diagram showing relative position of levels in Conundrum and 
Midget mines. 
