wmght ND ] DEVELOPMENTS IN SOUTHEASTERN ALASKA. 63 
ssociated with quartz, occur in parts of the workings and form what 
i locally termed a jasper ore. 
The developments at Niblack anchorage at the time of the writer's 
isit consisted of an inclined shaft 180 feet deep and, leading from 
lis at three different levels, 660 feet of drifting and crosscutting. 
The ore is said to carry 5 per cent copper and $L.50 to $2 in gold 
alues. Concentration of this ore would not be practicable owing to 
s massive state and the high percentage of valueless iron pyrite, 
hich can not be separated from it except by smelting or some pro- 
Iss of solution and reprecipitation. The mine is most favorably 
tuated and the ore from the shaft may be transported in cars directly 
) scows or barges for shipment to the smelters. A water-power at 
le head of the anchorage is controlled by the company and can be 
sed to develop enough electric power for mining purposes. 
Kasaan Peninsula. — On the northeast side of Kasaan Peninsula is a 
roup of seven claims, the property of the Brown Alaska Company, 
his is one of the recent discoveries in the vicinity of Ketchikan and 
by far the most extensively developed, especially in regard to 
irface equipment. The country rock near Hadley, as well as of the 
reater part of the peninsula, is composed of the Kasaan greenstone 
ith occasional intervening beds of much wrinkled limestone altered 
marble. . Interstratified in the limestones are beds of magnetite, 
! ten carrying chalcopyrite. Dikes of felsite and more basic rocks 
e intruded into both the greenstone and sedimentary beds. The 
Ineral trend of the sedimentaries is north-south, and the dip is to the 
est. The deposits form irregular lenses generally concordant with 
Le dip and strike of the formations, and seven such masses have thus 
r been discovered, varying from 100 to 150 feet in length and 20 to 
I feet in width. The ore, essentially chalcopyrite, is said to contain 
5 to 4.5 per cent copper, with $1 to $2 in gold values. The peculiar 
^currence of these copper deposits and the intimate relation of the 
trusives and magnetite beds to the ore bodies will be treated in 
>tail in the more extended report. 
Considerable underground development of the ore bodies has been 
complished. Two shafts -10 and 80 feet deep, and three tunnels from 
'0 to 200 feet in length, with many drift tunnels, expose the deposits 
various elevations. On the surface a 500-ton smelter has been 
ected, also a large compressor plant and various other necessities for 
e economical extraction of ore. 
On the southwest side of the peninsula is the Mount Andrew group 
claims on copper deposits, which have the same manner of occurrence 
the deposits last described. A tunnel 800 feet in length has been 
iven, but no work was in progress this season. The value of the 
e, chiefly chalcopyrite and magnetite, is said to be li per cent in 
pper and §1 to $3 in gold. 
