34 ALASKAN MINERAL RESOURCES IN 1905. 
the adit level, has been exposed 400 feet in length and averages 5 feet in width. Sixty fe 
below the adit level its length is only 100 feet and its average width 2 feet. Both to tl 
north and the south the vein narrows to a fissure filling a few inches wide. The goj 
values arc uniformly distributed throughout this vein and are essentially in a free stat 
Pyrite and chalcopyrite, with malachite and azurite as alteration products, are the accon 
panying minerals. A second and much larger ore body lies to the northwest of the I'oo 
wall vein and has an average width of 10 feet throughout its length of 400 feet. Seven 
thousand tons of ore have been mined from this ledge in past years, but its value is said t 
be too low to warrant further extraction. The third or hanging-wall ore body is to th 
southeast of the first mentioned. It is, however, poorly defined and consists of an irregula 
fissure Idled with mineralized diorite fragments and quartz stringers. The lode is expose 
in a drift for L50 fret in length and from 2 to 6 feet in width. Its gold content is somewha 
greater than that of the second ore body. 
The ore is treated in a LO-stamp mill equipped with Frue concentrators and operated b 
water power. A tramway 5 miles in length is being built from the mine to a point opposit 
deep water near the head of Berners Hay. 
Adjoining the Jualin mine to the uortheasl is the Indiana group, the property of th 
Alaska Gold Mining Company. The claims were located in L896 and were believed to bi 
on the extension of the Jualin and Comet veins. Three tunnels have been driven int< 
diorite count rv rock on t he west slope of Johnson ( 'reek. The main t unnel, at 850 feet ell 
vation, is 1.10') feet in length, with 500 feet of drifting to the north and south near its face 
Sixty feet from its entrance the tunnel crosscuts a narrow belt of quartz stringers carrying 
chalcopyrite and pyrite which yielded a small amount of ore. \'o other lodes were exposes 
by I his lower tunnel or in the two entering at points 100 and 200 feet above it. 
A LO-stamp mill, together with a water-pipe line several thousand feet in length, was con 
st rue led on JohnSOE Creek below the lower t unnel, but !ic\ cr operated. 
Many other prospects are located within the Berners Bay district, and some of the ore 
bodies exposed are worthy of extended development. Those which have received the most 
atti ntion are the Fremming and the Falls groups, located on Johnson Creek below Jualin 
mine, and the Little Johnson, the Gold King, and the Medicine Bird groups of claims at the 
head of Johnson Creek. On Sweney Creek prospecting has continued on a wide quartz lode 
with s ; ,t isfactory results. The construction of a stamp mill and further underground devel- 
opments are planned for L906. 
The properties of the ( rreek Boy Mining Company are located 4 miles from deep water on 
a creek t ributary to Berners Bay River. The ore body exposed consists of a band of mineral 
ized slate S to 20 feet wide cut by quart/, stringers, some of which are a few feet in width. 
The lode follows the contact of the diorite intrusive rock which forms the foot wall, strikes 
X. I.V \\\, and dips 85° SW. Many openings have been made along this contact, but 
most of the prospecting has been confined to one claim on which two tunnels have been 
driven, cadi following the lode for several hundred feet. The sulphide minerals of the 
deposit are irregularly distributed and appear to be small in amount. No work beyond that 
required by law was done in 1905. 
On the south side of Berners Bay prospecting was advanced on various mine locations, 
including the Berners Bay claim. In Echo Inlet assessment work was completed on the 
California and Gold Standard groups and encouraging results were reported. 
YANKEE BASIN. 
The area in and about Yankee Basin was the scene of much mining activity last summer. 
Developments were continued on various properties and several new and promising ore 
bodies were discovered. 
The Julia group of claims is located in the upper portion of the basin at altitudes of 2,000 
to 2,800 feet. On this group six ore bodies have been exposed, namely, the Cascade, a 0-foot 
quartz vain; Julia No. 1, a 12-foot lode of mineralized schist and quartz; Julia \o. 2, an 
8-foot lode of the same character; Dividend, a 12-foot lode of mineralized black slate cut, 
