84 ALASKAN MINERAL RESOURCES IN 1905. 
This tunnel is 412 feet long and contains practically no ore. The vein was not encountered, 
unless a barren, narrow shear zone represents this vein where crossed by the tunnel. 
Fait her cast, on the west side of Landlocked Bay, near the head, the Three Man Mining 
Company has recently conducted explorations. Three tunnels, the longest being 50 feet 
in length, have been run in along a shear zone containing a layer of fairly solid sulphides. 
This layer varies from an inch to 2 feet in thickness and has on its hanging-wall side some 
chalcopyrite disseminated in the sheared country rock. The vein has a general east- 
west direction and dips toward the north. A small shipment of ore has been made from 
this place. To the west, on the south slope of Copper Mountain, the same company has 
oilier prospects of a similar nature. 
In this immediate vicinity other prospectors (especially Messrs. Putz, Steinmetz, Egan, 
Bourke, and Steele) have been working on similar veins, which show layers of solid sul- 
phides up to 3 feet in thickness. At one of these (Centaur and Standard claims), a mile 
northeast of the summit of Copper Mountain, the vein has been exposed at intervals for 
a distance of 400 feet. Here there is a layer of sulphides (chalcopyrite and pyrrhotite) 
from 2 inches to 3 feet in thickness. The shear zone of this layer averages 15 to 18 inches 
in width and contains a little ore. The strike of the vein is N. 48° E. and the dip is from 
80° to 90° E. 
ORCA. 
A mile and a half southwest of Orca is a small sand spit known as Flemming Spit. Two 
streams enter the hay near this point. On the westerly and larger of these streams, three-* 
fourths of a mile from its mouth and about 500 feet above the sea, there are two small 
prospeel holes. The country rock is a much crushed, reddish, amygdaloidal basalt, withi 
irregular stringers of epidotized rock. These stringers are of all widths up to 2 feet, and 
while some of them have a vein-like form, striking in an east-northeast direction and stand- 
ing vert icalk . most of them show no common direction of elongation and pinch out in short 
distance-. With the epidote is quart/,. The ore, which is chaleoeite, occurs associated 
with and in the epidote-quartz stringers, although in places it is associated with the non- 
epidotized country rock. No vein of ore can be said to exist here — only irregular masses 
of -mall size. Some native copper has been reported from this locality. The country 
rock, its alteration to epidote-quartz masses, and the occurrence of copper ore with these 
masses all resemble conditions in parts of the Lake Superior copper district, except that in 
the latter district the ore is native copper, 
GLACIER ISLAND. 
Glacier Island is composed almost exclusively of greenstones of the Orca series. There 
are several prospects on and near the east end of the island and also on the eastern shore 
of the hay which indents the southern coast of the island. These prospects are (1) in 
veins running along shear zones, and are closely similar to those about Copper Mountain, 
(2) in irregular stringers in the greenstones, and (3) in quartz veins. One of the last typo 
occurs just southwest of a small lake less than a mile from the east end of the island. 
Here a short tunnel has been run in to cut a vein 10 feet in width. The strike is N. 2'A° E. 
and the dip 70° N. Along the foot wall of the vein is a 2-inch seam of clay gouge. The 
vein material is mainly quartz and fragments of country rock (greenstone), with small 
amounts of chalcopyrite, pyrite, and apparently marcasite. 
KNIGHT ISLAM). 
In a few places along the eastern shore of Knight Island a small amount of prospecting 
has been done. One of these points is about 4 miles north of the south end of the island 
and at the north side of the entrance to a small bay. There are two tunnels here, running 
northward from the shore. The western tunnel is about 150 feet long and in its last AO 
feet passes out of the rock into the glacial drift. The ore is chalcopyrite, which occurs 
in small stringers in greenstone. The eastern tunnel is 25 feet long and runs along a 
