ransome.] MINES OF SULTAN MOUNTAIN. . 253 
inches of excellent ore, largely tetrahedrite, which averaged LOO 
ounces of silver and 10 per cent of copper. In 1883 the Ajax and 
Victoria were being developed by tunnels. None of these lodes lias 
thus tar been worked on an extensive scale. 
They are all simple, nearly vertical fissure veins in monzonite. 
The ore is mineralogically similar to that found in the North Star lode, 
viz, galena, sphalerite, tetrahedrite, chalcopyrite, and pyrite, in a 
gangue consisting chiefly of quartz with sonic barite. With the pre- 
vailing price of silver, the ore is, as a whole, Low grade 
The Empire tunnel enters the mountain about L50 feet above the 
bed of .Mineral Creek, and has a straight course of S. ;35° W. It cuts 
the Little Dora vein about 1,230 feet from the tunnel mouth. About 
900 feet farther in it passes through a fissure about L0 feet wide, 
filled with crushed rock and gouge, but containing no ore. This is 
probable the Jennie Parker-Hercules lode, which it was expected to 
cut about 800 feet beyond the Little Dora. The tunnel was 150 feet 
beyond the large fissure in August, L900, and si ill driving on in solid 
monzonite. An upper tunnel. 208 feel vertically above and aboul 
400 feel west of the Empire 1 unnel, formerly known as the Montezuma 
and used to work the little Dora, has been relocated as the Boston 
tunnel and extended through to the Hercules lode, here found to be 
a strong vein up to 1<» feel wide dipping to the southeasl at about 85 
It showed evidence of post-mineral movement along the fissure, par- 
ticularly along the foot wall. The Empire-Victoria vein, as drifted on 
from the Boston tunnel, is fairly regular and shows a width up to 7 
feel. Its dip is somewhat variable — in places as low as 65 to the 
southwest. Hiibnerite, associated with fluorite, occurs as crystalline 
streaks and hunches next the hanging wall, and usually surrounded 
by sofl gouge. It is probably of later formation than the ore. 
On aceonnt of the very favorable location of the Empire tunnel it 
is expected thai ore considerably below what is commonly regarded 
as the lowest grade for profitable working in this region can be here 
successfully handled. 
Other mines a ml prospects. — The Eairview is a prospect a little 
more than a mile south of Si lverton, ai the contact between the intru- 
sive monzonite stock of Sultan Mountain and the Algonkian schists 
and overlying limestone. The property includes a nearly uorth-and- 
south vein, carrying ore mineralogically similar to thai of the Hercules 
lode. Tin- Devonian limestone also, near the monzonite, has been 
mineralized and carries particles of native silver. Argentite is also 
reported. Two tunnels, one 200 and the other 600 feet in length, have 
been run, but there is not enough development to allow satisfactory 
study of the deposit. 
The King lode is a quartz vein in Algonkian schists in Cataract 
Gulch, and outcrops just below the basal conglomerate (Cambrian:') 
which underlies the Devonian limestone and rests unconformably 
