60 ALASKAN MINERAL RESOURCES IN 1900. 
about Mount Edgecumbe. The core of both of the islands is made 
up of granitic intrusives, forming broad belts that strike across the 
island in a northwesterly direction and invading all the bedded rocks 
except the recent lavas. Near the contact of these granite masses are 
located the mineral deposits. 
BARANOF ISLAND. 
Many gold- and silver-bearing quartz veins and lodes, usually of 
low grade, have been discovered in the area adjacent to Silver Bay. 
Of importance are the Cache, Lucky Chance, Liberty, and Silver 
Bay prospects, at which much development work was done in former 
years. For a number of years, however, no attempt has been made 
to work these properties and only meager developments have been 
accomplished. 
At Rodman Bay, on the north side of the island, mining operations 
were closed in 1904, and most of the machinery and mine equipment 
has been sold and removed from the property. A vast amount of 
capital was invested in these prospects, and not until a railroad and 
120-stamp mill had been built did the investors realize the actual 
value of their mine. 
( )t her prospects were observed in Port Conclusion and Port Lucy, 
but these, too, have been abandoned. 
CHICHAGOF ISLAND. 
The only area on Chichagof Island within which auriferous veins 
of importance have been discovered lies to the east of Cape Edward, 
an island point projecting into the Pacific Ocean. These deposits 
were first noted early in 1905 by Indian fishermen, and within the 
last two years valuable veins have been developed at this locality. 
The prospects are on the north and south slopes of a mountainous 
divide between Klag Bay and Hirst Cove. The country rock is made 
up of an outlying belt of slates, graywackes, and conglomerates con- 
stituting the lowlands along the coast and overlying the slate and 
greenstone tuff beds which compose the flanks of the bordering 
mountain range. Farther inland and to the east of this series belts 
of limestone interstratified with metamorphic schists skirt the contact 
of the granodiorite intrusive which forms the core of the island. 
The auriferous veins so far discovered lie near the line of contact 
between the outlying slate-graywacke beds and the slate-greenstone 
strata, at a distance of 3 miles from the granodiorite belt to the north- 
east. These strata strike northwest and dip steeply to the south- 
west. The veins have a general trend parallel with the rock beds, 
though some of them crosscut decidedly and in a northerly direction. 
The occurrence of the ore in shoots is apparent from the localization 
of very rich ore at certain points and the barrenness of the veins at 
