176 GEOLOGY OF ASPEN MINING DISTRICT, COLORADO. 
there is some ore, both in dolomite and in blue limestone, which shows a 
tendency to follow certain shoots along the Contact fault. The end of the 
incline is in a highly brecciated zone, which is probably near the Justice 
fault. Just southeast of the shaft there is a series of stopes which have a 
northeast-southwest trend and are nearly vertical. Along these ore has 
been taken out continuously from the Contact fault up through blue lime- 
stone to the overlying shale. This shoot continues northeast until cut off 
by the Silver Bell fault. The ore is a broken and mineralized blue lime- 
stone, and its walls are smooth and distinct. It is evident that it formed 
along a fractured zone in the limestone, although neither the dolomite below 
nor the shale above shows any displacement. This ore shoot, in the lan- 
guage of one of the miners, was “‘the bonanza of the park.” 
The ore is in general low grade, is entirely oxidized, and contains a 
large amount of barite, thus corresponding with most of the other 
Tourtelotte Park ores. 
Last Dollar, Minnie Moore, and 0. K.mines—The Last Dollar, Minnie Moore, and 
O. K. form, with the Justice, a continuous series of workings underlying 
the upper part of the Tourtelotte Park basin. Most of these workings run 
on the Contact fault, and consist of inclines dipping with the fault about 
30 degrees to the northwest, from which levels run out. The Contact fault 
in these mines is remarkable for the immense amount of low-grade ore 
which is formed along it. This ore is in many places practically continu- 
ous, and presents to the eye the appearance of great mineralization, since 
it is soft and pulverulent, is stained red and yellow with metallic oxides, 
and contains a large amount of barite. Most of it, however, has a very 
low amount of lead and silver, and the large amount of barite is a disad- 
vantage, so that thousands of tons have been uncovered which can not be 
profitably shipped. Along this mineralized zone the rocks show the 
influence of dolomization and of silicification. 
Those ore bodies which are of higher grade and which have been 
profitably shipped seem to occur in steeply dipping fractured zones which 
traverse the Contact fault. There are several such zones shown in the 
mine, some of which have an east-west trend, while others run north and 
south. Along these the ore has been followed up for varying distances, as 
is the case with the great ore shoot of the Justice (which has been called 
“the Canyon”), and these ore bodies have blue limestone on both sides. 
