ransome.] LODES OF UNCOMPAHGKE CANYON. 197 
dipping about 85° to the north. The mine has been quite extensively 
worked through five tunnels. Most of the pay ore has been extracted 
from the four upper tunnels. The lower one was a more ambitious 
venture, opened in connection with a mill in an attempt to work the 
property on a large scale. Although the lode has produced some 
good ore, it is doubtful whether it is sufficiently abundant, or accom- 
panied by enough lower-grade ore, to justify an extensive plant. 
The Mint reports credit the mine with a total product of $105,751 
during the years 1890-1892. In 1899 the second and nearly third 
levels above the mill adit were being worked by Italian leasers at a 
very small profit. The country rock is the andesitic breccia of the 
San Juan formation. 
The lode filling is usually less than a foot in width and frozen to the 
walls. It is accompanied, however, by considerable parallel sheeting 
and veining of the adjacent country rock, and the lode itself contains 
thin sheet-like horses. The fissures are clean cut, regular, and quartz 
filled, carrying greater or less amounts of ore. Where stoped in the 
upper of the two tunnels worked in 1899, the lode consists of numer- 
ous small stringers, frozen to the country rock and separated by thin 
sheets of the latter. It is an excellent example of a deposit filling 
empty spaces in a sheeted zone of much regularity. The pay streak 
is usually only a few inches wide and lies on the south wall of the 
vein. It carries tetrahedrite, galena, sphalerite, pyrite, and chalco- 
ipyrite. The tetrahedrite is not rich in silver. Small vugs and comb 
Structure are common, often with crystals of tetrahedrite and rhodo- 
chrosite projecting with the quartz into the open spaces. The 
country rock is impregnated with pyrite and chalcopyrite, but is 
sharply distinguishable from the vein filling. Fluorite was noted on 
the dump of the uppermost tunnel. 
The Mick} 7 Breen lode is crossed by a conspicuous system of approx- 
imately parallel fissures striking about N. 20° W. and dipping east 
about 80° to 85°. These fissures usually cany small quartz veins, often 
showing comb structure. Two narrow and conspicuous zones of 
sheeting, accompanied by considerable veining, one striking N. 20° 
AY. and the other N. 7° W., are indicated on the map. These con- 
verge toward the north and form the lode of the Silver Link mine, 
and possibly also the Silver Queen lode, in Bear Canyon, on the north- 
ern border of the quadrangle. The relation of these fissures to the 
east-and-west Micky Breen lode could not be determined. 
The Micky Breen mill, on the Uncompahgre River, is equipped with 
a Blake crusher, 2 sets of rolls, 1 5-foot Huntington mill, trommels, 
and 7 4-foot Frue vanners. It was run by water power and steam. 
The mill had been idle some time when visited in 1899. 
Happy Jack mine. — This property is situated just west of the 
Micky Breen, and apparently on the same vein. It at one time shipped 
a little ore and then erected a mill, but the ore gave out. Mine and 
