MINES OF RAVEN AND UUYOT HILLS. 
343 
shattered rock was described by Superintendent Bush as passing into breccia showing 
very conspicuous sheeting parallel with the walls of the basalt dike. Some of the 
fissures of this sheeted zone were so open as to admit a man’s arm. A little sylvanite 
or calaverite was found on the faces of these slabs, associated with fluorite. The 
breccia was clearly indurated, shattered, and to some extent recemented before the 
intrusion of the “basalt,” which shows only the usual platy parting or sheeting 
parallel with its walls. The eruptive contact of the “basalt” is well shown in 
winzes below level 15, and in one or two cases the interstices between the fragments 
of shattered breccia were observed near the dike 
to be filled with basaltic glass or pitchstone. 
Throughout the mine the rocks exhibit a domi¬ 
nant north-south vertical sheeting. 
» 
LODE SYSTEMS. 
The only lode of importance in the Moose 
mine is the basic dike, already described. In 
the northern part of level 15 a sheeted zone in 
breccia, striking about X. 20° E., has been fol¬ 
lowed toward the Kentucky Belle mine, but no 
ore has been found. 
CHARACTER OF ORE. 
The ore which made the Moose one of the 
best-known mines in the early history of the 
district occurred above level 6 and within 300 
feet of the surface (fig. 38). It was for the most 
part oxidized, consisting of dull gold in minute 
irregular fractures in the basic dike. Calaverite 
was occasionally found, and was evidently the 
form in which the gold was deposited prior to 
oxidation. Specimens of this ore preserved in 
the office of the mine show more or less greenish 
emmonsite (?) and earthy tellurite associated 
with the gold. According to Mr. Philip Argali, 
Some of the Moose Ore cont ained as much as 25 Fig. 37 .—Plan of level 15 of the Moose mine, show- 
. , ing relation of phonolite and basic dikes. 
ounces of silver per ton, the average being 
about 1 ounce of silver to 2 ounces of gold. It is not known in what form this 
metal occurred, but it was probably in tetrahedrite. The deeper levels of the 
mine have shown occasionally a little calaverite associated with fluorite in fissures 
in the basalt dike and in the neighboring breccia. In the winzes below level 15 little 
veinlets of tetrahedrite, galena, and sphalerite, associated with quartz, fluorite, and 
dolomite or calcite, were noted at the time of visit. These little veinlets occur in 
the “basalt” or at the contact between the “basalt” and the breccia, and are usually 
less than a quarter of an inch in width, the ore minerals occurring in their medial 
portions. Some of the cavities and small fissures in the shattered breccia near the 
dike are lined with a drusy aggregate of quartz, fluorite, dolomite, pyrite, and 
