QUEENS GULCH. 203 
is well determined by underground workings and by outcrops, and has a 
heavy downthrow on the northwest side. As is usually the case in faults, 
it does not necessarily consist of a single plane of movement, but of sev- 
eral, which include between them narrow slices of rock that distribute 
the total displacement. In the Aspen Contact and Leadville mines, for 
example, two of these interdependent faults are well exposed. 
A large part of the fault is entirely barren of ore, the explorations in 
the Bimetallic tunnel being especially significant. In the Aspen Contact 
and Leadville mines, however, large quantities of rich ore have been taken 
out. Every characteristic of this ore shows that it was not formed in place, 
but was dragged into its present position by the faulting. The movement 
along the fault was nearly vertical, so that the rocks on the southeast side 
have probably dragged up this ore from some point almost directly below. 
Where this point is it is not possible to prove, but the fact that ore occurs 
in place along the Silver fault in the Tilly shaft is significant. 
Section A of the 300-foot map (Atlas Sheet XXX) shows the probable 
depth of the Silver fault between the shales and the Leadville dolomite on 
the northwest side of the Lenado fault, in the region of the Aspen Contact 
mine, and it is very probable that the ore may have actually been dragged 
up aloug the Lenado fault from this lower horizon. The Silver fault, which 
is displaced by the Lenado fault, is shown only on the northeast corner of 
the map as it runs down into Woody Creek. Its continuation on the 
southeast side of the Lenado fault is not shown, since it runs: into this 
fault a short distance beyond the southern edge of the mapped area. 
Section A is taken through the Aspen Contact tunnel; Section B 
through the Bimetallic tunnel. The geology shown in both these sections 
has already been described. 
QUEENS GULCH. 
On the west side of the Castle Creek fault, and southwest of Tourte- 
lotte Park, there is considerable mineralization in a strip beginning in Ophir 
Gulch and extending southward. In many places small quantities of rich 
ore have been discovered, and it is possible that in the future the district 
may become a heavy producer. One of the best opportunities for studying 
this mineralization is in Queens Gulch. Pl. XXX is a view of Queens 
Gulch taken from the west side of Castle Creek and looking across the 
