LODE MINING IN SOUTHEASTERN ALASKA. 55 
At the Alaska-Juneau mine operations were renewed in May and 
continued until November, as in previous years. During this time the 
30-stamp mill was in continuous operation, an average of 4,200 tons 
of rock being milled per month. The ore mined was mainly from the 
open cuts and raises which were driven to open the back pits at lower 
levels. 
At the Perseverance mine the greater portion of the work done was 
in the erection of a 100-stamp mill, which is to begin operations early 
in 1907. In the mine developments have been confined to an ore 
body 60 to 80 feet wide, consisting of a heavily mineralized black 
slate, cut by numerous quartz veins carrying pyrrhotite, chalco- 
pyrite, galena, and sphalerite. This lode has a general northwesterly 
strike and dips 65° NE. At the time of the writer's visit it was 
exposed by a drift 1,000 feet in length at tunnel level and partially by 
a raise 920 feet long from the tunnel to the surface. From this raise 
100 feet above the tunnel an intermediate drift, 350 feet long, has 
been driven in both directions along the lode and connected by raises 
with the tunnel drift. Other levels at intervals of 100 feet will be 
started from this main raise. 
On the Boston group of claims, at the mouth of Gold Creek, a min- 
eralized dike 50 feet wide is exposed similar to those found at the 
Ebner mine. This dike as a whole forms a very low-grade ore, and 
as yet no attempt has been made to begin its extraction in large quan- 
tities. The annual assessment work has been accomplished from 
year to year, and the present developments consist of a shaft 118 feet 
deep, from which 500 feet of drifting and crosscutting have been 
extended. 
No improvements worthy of note were made on any of the other 
lode mines or prospects within the Gold Creek or Sheep Creek drainage 
areas last year. 
The placer deposits of Silverbow Basin were again leased by the 
Silver Bow Hydraulic Company, and operations began the latter part 
of April and closed the latter part of October. During September 
work was suspended because of low water. The gravels were worked 
by a hydraulic giant having a 6-inch nozzle, and bowlders were handled 
by a cable with boat attachment. The gravel bank under attack is 75 
feet high and in it the highest values are found where the oxidized 
sand streaks are present. 
At the lower basin, on the property of the Jualpa Mining Company, 
no attempt was made to mine the gravels. 
