210 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
W 
Damon shaft 
on the ore shoot, locally depressing the values or wholly eliminating them. This, 
however, is exceptional. 
Although the location of ore shoots is so striking^ dependent upon intersec¬ 
tions of veins that it might at first glance be considered as the only factor influencing 
the distribution of the ore, this as will be seen further on, is by no means true. 
The ore shoots occur very commonly on intersections of veins, but this is observed 
chiefly in the case of smaller shoots and in smaller mines in which fissures intersect 
in various directions. The largest ore shoots in the camp can not be explained by 
the simple intersection of two or more 
fissures. In the occurrence of these 
smaller ore shoots along intersections 
the so-called “flats,” or gently dipping 
joint planes, are of especial importance, 
as bodies of ore are very frequently 
found where they cross the vertical or 
steep fissures. In some cases the pay 
ore occurs exclusively in the “flats,” 
but very close to the intersection, while 
in other cases the ore is contained chiefly 
in the steep veins and is suddenly cut 
out by gently dipping seams. Some 
very large bodies of ore have been found 
on these flat seams, which in themselves 
are rather inconspicuous. In the fol¬ 
lowing paragraphs a few examples from 
among the more important mines of the 
district will be given in order to illus¬ 
trate this remarkable dependence of 
shoots on intersections. 
In the Abe Lincoln the pay shoots now worked occur southeast of the shaft at 
the intersection of two or more of the individual, indistinct, and not very persist¬ 
ent fissure zones in gneiss. 
In the Jerry Johnson little ore was found down to the 300-foot level. At this 
place an ore shoot about 80 feet long occurred along the vein, but was cut off 40 
feet above the level Iw a flat seam. A similar flat seam cut off the values in the 
W. P. 11. vein. In other parts of the mine, however, the flat veins carry some ore. 
At the Damon mine (fig. 17) the principal ore bodies were found on several flat 
veins near the place where these intersected or joined a steep-dipping fissure. 
In the Howard flat vein an ore body, in places 6 feet thick, occurred where 
this vein was intersected by a perpendicular fissure. In the same vicinity the 
Work lode contained ore where it intersected No. 2 Mary McKinney lode. On the 
Anaconda adit level the breccia contains many fissures of various strikes and dips. 
Where two or more intersect there is usually a small body of ore. 
Although the main ore body of the Mary McKinney mine has no apparent 
connection with crossing fissures, many instances of the rule here discussed may 
be found in the northern part of the mine at the intersection of lodes. The Le Clair 
Volcanic breccia Schist St opes and vein 
Sea I e oF -feet. 
0 ioo 200 300 
i-1_i___» 
Fig. 17.- 
-Diagram of veins and stopes in upper levels of 
Damon mine. 
