82 ALASKAX MINERAL RESOURCES IN 1905. 
shoot which forms the middle of the foot-wall half of the ore. body. The country rock is 
soft black slate, with a few bands of graywacke and black limestone. The strike of the 
rocks is in general parallel to that of the ore body. Greenstone bowlders, evidently from 
rock close al hand, occur 150 feet north of the shaft. The black slate is much fissured and 
crushed and the fragments are commonly slickensided. The ore is in the main massive and 
not fractured, although there are some small cracks which have been filled with calcite. 
Search for other ore bodies in the direction of the strike of the one now being mined does not 
seem to have been made. 
The Bonanza mine is situated near the east shore of Latouchc Island, within half a mile of 
tide water, to which a tramway has been built. The ore now being taken out is from the 
face of a cliff. A working tunnel has been run into the ore body 30 feet below the surface 
workings, and anol her t uimel, intended to crosscut the ore at a depth of about 70 feel below 
the first tunnel, was being run during the summer of 1905. Ore shipments of a few hun- 
dred tons monthly were made last summer, and there is good reason to expect that these 
shipments can he markedly increased in the immediate future. The ore body as first 
exposed rises in a westward-facing cliff, and from this cliff most of the ore now being shipped 
is quarried. The upper tunnel just mentioned crosscuts at least part of the ore body, and 
shows a width of 68 feet of ore which can, with a little soiling, be shipped. Beyond this, to 
the east , t he tunnel cuts about 100 feet of rock which contains stringers of ore. "West of 
the 68 feet of ore just mentioned there is said to be a thickness of about 58 feet of softer 
ore, which is now covered by the timbering of the tunnel, and about 150 feet farther west is 
a band of nearly pure pyrrhotite. It is possible that the ore body extends westward to 
this pyrrhot it c hand. The length, except for about 200 feet, and the depth, below 30 feet , 
of i he ore body have not been explored. The ore is chalcopyrite. This occurs in brecciated 
p*>ii ions of the country rock and in irregular veins, and in places it partially or completely 
replaces the country rock. This ore deposit lies along a brecciated and sheared zone, and 
strikes about X. 10° E., dipping 60° W. This is the general strike and dip of the rocks in 
the vicinity. The main rock in the ore is a very fine-grained, greenish-gray, hard, flinty 
material. To the east of this is graywacke and quartzite, while to the west there is mainly 
black slate. No igneous rocks were seen in the immediate vicinity of this mine, but rocks 
apparently of this nature occur less than a mile to the north, at the Blackbird claim, and 
also at the north end of Latouchc Island. 
COPPER PROSPECTS. 
A considerable number of prospectors were at work in Prince William Sound during the 
summer of 1905, and previous to that time other prospects had been explored which were 
not being worked last summer. Below arc brief descriptions of a number of the prospects. 
Those selected for description are not necessarily the richest in the district, but are those 
which, because of their geographical location or other points, are of interest. In none of the 
places described is machinery used, with the one exception of the workings of the Reynolds- 
Alaska Development Company, at Boulder Bay. The chief center of interest for pros- 
pectors is the vicinity of Copper Mountain. This is a ragged-crested mountain, rising 
nearly 4,000 feet above sea level and situated about 4 miles southeast of Ellamar. Boulder 
Bay is at the west base of this mountain and Landlocked Bay at its south base. The rock 
of Copper Mountain is greenstone, with a small amount of sediments (slate, graywacke, and 
quartzite). 
SOLOMON GULCH. 
Entering the south side of Port Valdez neat its east end is a stream which flows through 
Solomon Gulch. Five miles south from the shore of Port Valdez, and just east of this 
stream, but still in the bottom of the valley, a prospect has been worked to some slight 
extent by Valdez miners. A sheared zone of schistose rocks, impregnated more or less with 
sulphides of copper and iron, is exposed. At the time this locality was visited, m July, pros- 
pecting had uncovered a band of schistose and silicificd rock striking about east and west 
