124 ALASKAN MINERAL RESOURCES IN 1906. 
wide and cost $10 per running foot. By extending a tailrace across 
this flat, as debris collects, a practically unlimited dump may be ob- J 
tained. A flume 3 feet wide and 2 feet high, fitted with block riffles, 
will be used. Lumber, either whipsawed or brought in, costs about 
$100 per thousand. It is reported that abundant water to work two 
No. 1 hydraulic giants under a head of 400 feet can be secured by a 
1 , 000-foot pipe line 8 inches in diameter. The gravel bank, of which 
the greater part may be piped to the sluice, is 25 feet deep and is 
reported to run 50 cents to the yard. The gold is coarse, nuggets up 
to $20 and $60 having been found. 
COPPER. 
KNIK RIVER. 
In August, 1906, prospectors reported the discovery of copper in 
the high mountains between Knik and Matanuska rivers, but this 
locality was not visited. The ore is chalcopyrite (sulphide of copper 
and iron) and is associated with pyrrhotite (magnetic iron pyrites). 
The ledge is reported to be nearly vertical and has been traced 
through four claims. No actual development work has been done. 
The ore body is said to be 3 feet thick, consisting of 18 inches of solic 
chalcopyrite and 18 inches of quartz irregularly cut by stringers oj 
ore. Graphitic gouge matter occurs near the ledge. From the fore- 
going description it appears probable that the deposit occupies a 
mineralized shear zone similar to those found in the Prince William 
Sound region, both in its manner of occurrence and in the bed rock 
with which it is associated. The mountains between Knik and 
Matanuska rivers, though difficult of access, are thought worthy of 
prospecting. 
KASHWITNA RIVER. 
During the summer of 1906 assessment work was done on copper 
claims near the head of the north fork of Kashwitna River, a tribu- 
tary of the Susitna from the east. Samples of bornite said to occur 
in a granite were seen. The claims are about 1 20 miles from Knik and 
10 miles from timber. 
SUNRISE DISTRICT 
A copper prospect located on the west side of Lynx Greek, a south- 
ern tributary of East Fork, near the summit of the divide near its 
head, is being developed by the Ready Bullion Copper Company. J 
Boston, Mass. The country rock at this locality is a part of the 
gray wacke-sl ate series composing the central and northern mass o* ine 
Kenai Mountains. The dominant cleavage at this point is N. i0° E., 
a direction nearly parallel with the ridge in which the copper deposit 
to be described occurs. 
