342 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
which did not extend for more than 400 feet below the surface, was exhausted 
and the mine was closed. It was subsequently reopened and in spite of serious 
difficulties due to water and copious flow of gas into the workings, exploration 
was continued with great persistency in an endeavor to find deeper ore bodies. 
Early in 1904, however, the search was abandoned and the mine is now idle. 
PRODUCTION. 
The Moose mine has produced about 5,100 tons of ore of a gross value of 
$525,000, or an average value of nearly $103 per ton. The dividends paid by the 
company amount to about $144,000. 
UNDERGROUND DEVELOPMENT. 
The Moose shaft, a steep incline with collar 10,117.96 feet above sea level, is 
1,050 feet deep. It connects with 15 levels at various distances apart. The main 
drifts run nearly north and south and explore the Moose basalt dike for a maximum 
distance of about 2,000 feet. Level 6, 350 feet below the collar of the shaft, extends 
farthest south, being prolonged to the surface as an adit, of which the portal is 
1,200 feet south of the Moose shaft. Level 15 (fig. 37) has the greatest northward 
extension, having been driven beneath the old workings of the Bertha B. mine. 
The country rock on each side of the dike has been explored bj" crosscutting and 
diamond drilling. There are two winzes below level 15, one of 60 feet about 450 
feet north of the shaft and one of 20 feet in the Bertha B. ground. 
GEOLOGICAL FEATURES. 
The general country rock of the Moose mine is breccia of the usual Raven Hill 
type. This is cut by a dike of phonolite of general north-south trend and by the 
Moose “basalt” dike. The latter exhibits the usual tendency of these dikes to 
branch or to pinch out and reappear a few feet away in one wall or the other of 
the particular branch first followed out. The general strike of the basic .dike is 10° 
15° west of north, so that it crosses the phonolite dike. The actual crossing could 
not be seen, but the “basalt” is undoubtedly later in age than the phonolite. The 
general relation of the two dikes, as well as the frequent compound character of the 
basaltic dike, is shown in fig. 37, which is a geological plan of level 15. The phonolite 
dike is usually 10 or 12 feet wide, and is fairly regular and persistent. It is in some 
places aphanitic, in others porphyritic in texture, the latter being particularly the 
case in the southern part of level 6. The dike is practically vertical. The “basalt ” 
dike is usually from 2 to 3 feet in width. Near the shaft it dips steeply to the east, 
but on the whole is nearly vertical. The most interesting feature of the breccia is 
the pronounced local Assuring and shattering that it has undergone, particularly on 
the lower levels north of the shaft. This is well shown on level 15, where, from a 
point 128 feet north of the shaft, the breccia for a distance of 650 feet north is a 
porous mass of partially coherent angular fragments, resembling the material 
described in the Conundrum, Moon-Anchor, and Midget mines. This shattering is 
said to extend for about 400 feet above level 15, but the levels in which it is exposed 
were so filled with gas at the time of visit as to be inaccessible. On level 13 this 
