62 GEOLOGY OF ASPEN MINING DISTRICT, COLORADO. 
a fact which has been noticed in the parallel faults which belong to the 
same system as the Pride that the throw diminishes toward the south, and 
that there is, consequently, a gradual dying out; but this disappearance of 
fault movement is not so rapid in these cases as is shown for the Pride, 
so that it is probable that this fault continues much farther ito the granite 
toward the south. Its dip is nearly vertical, but it often, and perhaps 
usually, has a steep easterly dip, as shown in the cross sections. 
Along the Pride fault there has been extensive mineralization, which 
is shown in many places. The ore im the Pride of Aspen mine is found 
near this fault, as well as that in other workings. There is even a marked 
mineralization at the contact of quartzite on the east side of the fault with 
granite on the west side, at the very top of the hill, before the fault passes 
finally into the granite. This mineralization is shown in tunnels, where the 
quartzite is much altered and impregnated with iron and copper. Although 
the ore at this point has not proved to be of any great value, it is interest- 
ing as showing that the fault itself has been the chief channel for the ore 
solutions, and one of the chief things in determining the final location of 
WO@ ORE 
Saddle Rock faut. This fault, like the Pride, is well located and defined 
along most of its course by explorations which have been made in the 
search for ore. Its point of junction with the Pride fault is probably a 
short distance north of the breast of the Pioneer tunnel. ‘This tunnel runs 
across the fault from shale into blue Leadville limestone. Opposite and 
just west of this locality the Pride fault is shown cropping between the 
Broadway tunnel and the Sixty-six shaft. The belt between these faults 
at this point is very narrow, being but 150 or 200 feet, showing a marked 
convergence of the two toward the north; they probably unite not far north 
of this point, for only one fault is indicated by the- lgneous tunnel. Just 
south of the point where the Saddle Rock fault is cut by the Pioneer tunnel 
the fault describes a curve toward the east for a distance of 300 or 400 feet. 
This curving is sufficiently well indicated by various tunnels and outcrops 
along the line on which it is drawn on the map. From this extreme east- 
erly point of outcrop the line of faulting on the surface swings back a little 
to the west, and then continues nearly parallel with the main Pride fault, 
but apparently slightly approaching it. This curving of the fault outcrop 
is probably due to a local flattening, so that its dip here must be compara- 
ee EEO 
