W wmGHT ND ] DEVELOPMENTS IN SOUTHEASTERN ALASKA. 51 
In the Wrangell district, farther south, the principal deposits are on 
Woewodski Island, where the ore bodies consist of wide lederes filling 1 
brecciated fissures in the greenstone and carrying principally gold val- 
ues intimately associated with the sulphides, so that they are not suited 
for treatment by amalgamation. 
Copper is the predominating metal of the Ketchikan district, and 
deposits composed essentially of copper and iron sulphides occur in 
wide belts of greenstone in the form of lenticular masses many feet in 
width and often several hundred feet in length. Such ore bodies 
are being developed at Niblack and at Hadley for both copper and 
gold. Contact copper deposits between granodiorite and limestone 
and in some instances along the contact of a basic intrusive' dike, 
are well presented in the vicinity of Copper Mountain and at the 
Green Monster group, on the west side of Prince of Wales Island. 
At Dolomi, Hollis, and Sealevel the deposits, with slate, limestone, 
and schist as country rocks, consist of free-milling gold quartz ledges, 
1 foot to several feet in width, carrying both high and moderately 
ow values in gold. 
PLACEli DEPOSITS. 
The gold-bearing gravel deposits along the southeast coast of Alaska 
ire of low grade and are being worked as such at several localities, 
lamely: Shuck River at Windham Bay, Gold Creek in the vicinity of 
Juneau, McGinnis Creek 15 miles north of Juneau, Windfall Creek 
50 miles north of Juneau, and in the Porcupine placer district. Of 
;hese, only two, Gold and Porcupine creeks, have yielded placer gold 
n profitable amounts, though at the other localities developments are 
progressing rapidly, and it is hoped that they will soon arrive at the 
productive stage. 
MINES AND DEVELOPMENTS. 
SKAGWAY MINES G DISTRICT. 
The Skagway mining district includes that portion of the mainland 
erritory west of Lynn Canal to a point just north of Lituya Bay, 
ommonly known as Cape Fairweather, and also the strip of land on 
he eastern side of Lynn Canal north of a point opposite Sullivan 
sland. The northern termination follows the international bound 
ry between Alaska and British Columbia. The principal mining 
ocality of this section, the Porcupine placer district, was visited and 
eported upon in 1903. a Since that time developments have been con- 
inued on Porcupine Creek by the owners of the Discovery and other 
laims to the mouth of McKinle}^ Creek. The large bed-rock flume, 
egun last season, has been continued several hundred feet upstream 
a Wright, C W., The Porcupine placer district, Alaska: Bull. U. S. Geol. Survey No. 236. 
