LODE MINING IN SOUTHEASTERN ALASKA. 57 
EAGLE RIVER. 
At the Eagle River mine there has been a steady output during the 
year, and the 20-stamp mill has been in operation most of the time. 
The ore body, which is a wide quartz vein containing shoots of rich 
ore, is displaced by faulting, which is apparently confined to a depth 
of a few hundred feet from the surface. These displacements have 
shattered the country rock across considerable width and have been 
the cause of much trouble in the exploitation of the vein and in the 
extraction of the ore from it. Late reports, however, state that 
developments have extended into the solid formation below the 
faulted area, and that the vein is apparently in place. The total 
amount of drifting, crosscutting, and shaft sinking amounts to about 
6,000 feet. 
YANKEE BASIN. 
The principal work done in the Yankee Basin area was the driving 
of a crosscut tunnel to undercut the Dividend and Cascade lodes. 
This tunnel begins at a point just above the miner's cabin and was 
400 feet in length in October of last year. It was estimated to under- 
cut the Dividend lode at a distance of 530 feet and the Cascade at 
1,200 feet from the mouth of the tunnel. 
Except the small annual developments necessary no important 
progress was made on any of the other mines or prospects in this belt, 
extending as far as Berners Bay. 
BERNERS BAY. 
The limits of the Berners Bay region include the drainage areas of 
both Johnson and Sherman creeks. Extensive mineral bodies, con- 
sisting of huge stockwork deposits, well-defined fissure veins, and 
lodes, are exposed up these creeks. From these ore bodies the total 
gold production has been nearly a million dollars in value, the larger 
portion of which was obtained from the Sherman Creek mine previous 
to 1900. 
Since 1901 the only producing property has been the Jualin mine, 
located on Johnson Creek, 4 miles from its mouth and 730 feet above 
tide water. Three separate ore bodies, inclosed in the diorite country 
rock and having a general northwesterly trend and a dip of 60° NE., 
are exposed in the mine workings. Of these the foot-wall vein car- 
ries the highest values, and upon it mining and developments have 
been concentrated this last year. This west vein, as it is called, is a 
strong quartz-filled fissure, about 400 feet in length and averaging 5 
feet in width. Just below the adit level a fault was encountered with 
steep pitch toward the northwest; the displacement, however, was 
not great and the vein was readily recovered. This year a 50-foot 
inclined shaft was sunk from the 170-foot level below the adit tunnel. 
