350 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
used. The new shaft is 560 feet deep and the old shaft a little deeper, as it is higher 
up the slope. There are four levels connecting with the main shaft, designated as 
levels 1. 2. 3. and 4 and nm at 190, 310. 440. and 560 feet, respectively, below the 
collar. The general trend of these levels, as well as of the upper drifts from the old 
shaft, is X. 30° E. There are also some important drifts in the northern part of 
the mine, which run generally X. 75° E. Levels 2 and 4 connect with the old shaft, 
and also with two of the great drainage tunnels of the district, level 2 being contin¬ 
uous with the Standard tunnel and level 4 with the El Paso drainage tunnel. 
GEOLOGICAL FEATURES. 
The El Paso workings are in granite on the western side of the Beacon Hill 
Fig. 39.—Plan of level 2 . El Paso mine, showing relation of veins and ore bodies to phonotitic Lot instants. 
somewhat gneissoid. and contains numerous squeezed lenticular bodies of schist, 
which appear in some cases to have been derived from the granite by local shearing 
under great stress. The granite is cut by numerous dikes and sills of phonolite. 
many of which are clearly offshoots from the main phonolite plug. The most 
important dike is one striking about X*. 55° W.. shown in fig. 39. and also on the 
general geological map (PI. II. in pocket . The dike dips from 55° to 60° MV., and 
is usually 15 to 20 feet wide. From its importance in the El Paso mine this dike 
may be conveniently referred to as the El Paso dike. 
The contact between the phonolite plug and the granite is well exposed in the 
Australia tunnel and on levels 2 and 4 from the main shaft. It is a sharp, irregular 
