COPPER, ETC., OF PRINCE WILLIAM ROUND. 85 
quartz-filled shear zone, which contains a little chalcopyrite. About a mile south of I his 
locality is another claim, on which there is a vein 8 to 15 inches in width. The country 
rock is here gray quartzite, but greenstone is near at hand. The vein consists of rather 
solid sulphides (pyrrhotite and chalcopyrite), with some quartz and country rock. Prac- 
tically no exploratory work has been done at this point. 
About two-thirds of a mile northeast from the northeasternmost arm of Mummy Bay 
(which indents the southwestern shore of Knight Island), and about 1,300 feet above the 
water, close to the divide between this bay and the small bay in which are the prospects 
above mentioned, is another prospect in a shear zone in greenstone. This zone is 1 to ."> 
feet wide, and the ore is in irregular stringers and consists of chalcopyrite, pyrite, and a 
little pyrrhotite. This zone carrying ore is exposed at two points. The general situation 
here is closely similar to that in the vicinity of Copper Mountain. A mile north of the 
west end of Mummy Bay is another prospect, in which there is exposed a lens of ore 7 feet 
long and 2 feet wide at the surface. The ore is fairly solid pyrrhotite, pyrite, and chalco- 
pyrite. The country rock, which is here a rather coarse-grained dioritic greenstone, con- 
tains more or less disseminated sulphides (pyrrhotite with a little chalcopyrite), and in 
one irregular pegmatite vein there is more of this disseminated ore. 
Near the head of Drier Bay, which is near the center of the west side of Knight Island, 
work has been done on a prospect near the divide. This was examined by Sidney Paige, 
who reports as follows: 
A lens of ore approximately 30 feet wide and 40 feet high, consisting of chalcopyrite and pyrrhotite 
in greenstone (diabase) , occurs exposed in the face of a bluff 975 feet above the sea and 2,800 feet from the 
beach. The lens is of nearly solid ore and rather uniform in character. It cuts slightly across the 
general and dominant joint system of the country rock, which is very similar to the rock carrying 
the ore. The strike along the ore body — that is, its length — is S. 72° E., while the cleavage in the 
country rock is N. 80° E. to N. 17° W. Slightly above and to the northwest of this ore body occurs 
a similar but smaller lens, which strikes N. 7° W. and dips 02° N. It measures about 9 feet across 
the strike and is approximately 25 feet long. From all indications it pinches at both ends. Its depth 
is unknown. 
Of the country rocks in this vicinity there are three types — very fine grained, hard, nearly black, 
basic rock; a coarse-grained, black, basic diabase, and a porphyrytic diabase, the latter being the 
freshest of the lot. 
The ores seem to be a replacement of the country rock. The fact that the bodies occur as lenses may 
be suggestive. The strata seem to bend around the second and smaller lens in a manner to suggest a 
possible widening of the space between the walls. 
LATOUCIIE ISLAND. 
Both to the northeast and the southwest of the Bonanza mine prospecting has been done 
at a few points, apparently along the strike of the ore body at that mine. In several 
instances a vein of nearly solid sulphide ore, corresponding to that at the west side of the 
mine, has been encountered. The most extensive prospecting has been done on the Black- 
bird claim, about half a mile northeast of the Bonanza mine. Here there has been a con- 
siderable amount of trenching and a few shallow test pits have been sunk. These w< lik- 
ings show that the ore, which is in considerable amount, occurs both to the east and the 
west of the marked vein of solid sulphide. The ore (chalcopyrite) occurs disseminated 
through the rocks, which are here mainly graywackes and quartzitcs. It also occurs in 
rather solid veins, and a soft schistose rock which contains talc and also small cubes of 
pyrite is associated with it. This rock is probably an altered igneous rock. 1 1 is understood 
that the property has recently changed hands and that the new owners will begin active 
operations in the immediate future. 
About 4 miles southwest of the Bonanza mine work has been done on what is known as 
the Blue Fox claim. Here apparently the same band of solid sulphide, which is here mainly 
pyrite, has been encountered, and a tunnel 50 feet in length has been run along this sul- 
phide vein. Openings have been made also to the west, showing some ore. Crosscutting 
both east and west of the sulphide vein would probably show up more ore than is now in 
view. About half a mile northeast of this point is the Duchess claim, on which a branch- 
ing tunnel 300 feet in length has been run, 
