WRIGHT A 
WRIGHT 
ND ] DEVELOPMENTS IN SOUTHEASTERN ALASKA. 65 
of Prince of Wales Island; at Hollis, on the northwest side of Twelve 
Mile Arm and in the central part of the island; at the Hoadley Brothers' 
claims, 2 miles north of Ketchikan; at Thorn Arm, on Revillagigedo 
Island; at Miller's camp, on the east shore of Gravina Island, and on 
the southeast side of Dall Island. During the past summer operations 
were in progress on all of the above excepting the Sealevel mine at 
Thorn Arm, and the proposed future developments will probably cause 
these properties to rank as good gold producers. Besides the eventual 
gold production from the quartz ledges considerable copper will also 
be obtained from the above-described mines. 
Dolomi. — In the vicinity of the town of Dolomi, which is on John- 
sons Inlet, 36 miles west of Ketchikan, nearly a hundred locations 
have been made, but investigations have been confined principally to 
the Valparaiso, the Amazon, and the Golden Fleece claims. 
The ore deposit at the Valparaiso consists of a quartz ledge 6 to 8 
feet in width, occurring in a crystalline limestone country rock. A 
concentration of the gold values has taken place along pay streaks on 
the foot wall of the ledge and from this rich portion considerable ore, 
averaging $200 to $250 per ton in gold and silver values, has been 
been recovered. The minerals are principally free gold, tetrahedrite 
and pyrite, with quartz and calcite as gangue. Three inclined shafts 
100, 80, and 35 feet in depth and a few hundred feet of drifting and 
stoping expose the ledge at different points along its strike. The ore 
is well adapted for concentration, and when a mill is installed good 
returns may be anticipated across the entire width of the ledge. 
The quartz deposit at the Amazon claim is composed of ore of some- 
what lower grade, but the gold values are apparently uniformly dis- 
tributed. Its width varies from 10 feet at the surface to 1 foot at the 
bottom of a shaft 123 feet in depth. A calcareous schist, in places 
brecciated with quartz as the binding material, forms the inclosing 
rock. Developments on this relatively recent discovery give very 
encouraging results, and the ore value is reported to vary from $15 
to $30 in gold. 
The most extensively developed property is the Golden Fleece mine, 
located on James Lake, 2 miles from tide water, and connected with 
the wharf by a well-graded tramway. The quartz deposits here also 
have a dolomitic limestone as country rock, which is cut by many 
jsmall diabase dikes. A peculiar and advantageous feature of this 
[mine is the occurrence of several limestone caverns which apparently 
ifollow the mineral deposits. The quartz bodies are irregular lenses, 
[slightly cutting the bedding planes and varying from a fraction of a 
Boot to 8 feet or more in width. The dip is to the southeast at an 
jangle of about 40°. On the main ledge developments consist of two 
iJ200-foot tunnels which connect with, many of the above-mentioned 
Bull. 259—05 5 
