COPPER, ETC., OF PRINCE WILLIAM SOUND. 83 
and dipping steeply to the north. This belt was, as exposed, 30 feet in width, and consisted 
of siliceous schist, flinty slate, quartz, pyrite, chalcopyrite, and pyrrhotite. Later in the 
summer an option on this property was taken by persons interested in a smelter at 1 [adley, 
Prince of Wales Island, and their explorations are reported to have shown a width of about 
80 feet for this zone of schistose, sulphide-bearing rock. Close by is a mass of altered 
greenstone, probably existing as a dike. The country rock is schistose slate and graywacke 
of the Valdez series. 
GALENA BAY. 
Considerable prospecting has been done in a depression known as Vesuvius Valley, which 
extends southward from near the head of Galena Bay to the north flank of Copper Mountain. 
Work has also been carried on to the east and west. Some stripping has been done and 
several short tunnels have been run in on veins in the greenstone. These are along shear 
zones which commonly carry layers of sulphides. The most work has been done on a tun- 
nel which runs eastward under a spur extending to the north from Copper Mountain. This 
tunnel, dug by the Prince William Sound Mining Company, runs along a clay selvage, 
which is from an inch to a foot in thickness. Pyrite, pyrrhotite, and chalcopyrite in string- 
ers occur in and near this selvage, and small amounts of these sulphides are disseminated in 
the wall rock. The tunnel is mainly in greenstone, but a narrow band of black slate is com- 
monly seen along the foot wall of the vein, which strikes in an east-southeast direction and 
dips 75° NNE. This tunnel is about 300 feet long and was driven to intercept a large shear 
zone which occurs in the ridge to the east. The tunnel has not yet reached this shear zone, 
which is about 40 feet wide and contains considerable unsheared rock and locally carries 
bands and scattered grains of sulphides. 
BOULDER BAY.' 
Boulder Bay is situated about 4 miles southeast of Ellamar and is so named from the fact 
that on the beach are a few large bowlders made up of iron and copper sulphides. The 
largest of these is 20 feet in diameter. Several veins of the usual type have been discovered 
on both the east and the west shores of this bay. The principal development work has been 
done by the Reynolds- Alaska Development Company. At the location of the bowlders of 
iron-copper sulphide a steam engine, an air compressor, and power drills have been installed 
and a tunnel has been run eastward into the mountain about 300 feet, with the expectation 
of crosscutting some veins of ore which were known to outcrop higher up on the face of the 
mountain. In November, 1905, it was reported that a vein carrying a good grade of chal- 
copyrite was struck at a distance of 400 feet from the mouth of the tunnel. In addition to 
this tunnel the same company has done other development work on the west slope of Copper 
Mountain above this tunnel, and other prospectors, working on veins in shear zones in the 
greenstone have done work to the north of this and also on the west side of Boulder Bay. 
LANDLOCKED BAY. 
On the shores of this bay and running up on the south and east flanks of Copper Mountain 
are a number of rather well-exposed shear zones, mainly in the greenstone. Many of 
these carry copper and iron sulphides and have attracted much attention from prospectors. 
What is known as the Alaska Commercial Company claim is situated on the north shore 
of Landlocked Bay, and work was done here a few years ago. Recently another company 
has acquired this property and expects to resume explorations. About 500 feet above the 
sea, on the face of a cliff, is a shear zone 4 feet in thickness. The strike is N. 68° E. and 
the dip 75° to 80° N. In this zone is a layer of sulphides (pyrrhotite and chalcopyrite) 
2 to 8 inches in thickness. A tunnel has been run in on this vein and the ore taken out 
was lowered by a wire cable to the dock at the foot of the cliff. Perhaps 70 tons of ore 
mined a few years ago was shipped in the summer of 1905. Below this vein, 200 feet 
above the water, a tunnel was run northward into the cliff to intersect the above vein. 
