68 ALASKAN MINERAL RESOURCES IN 1904. [bull. 259. 
deposits comprise two quartz-filled fissures which are in part inclosed 
in a porphyritic dike; but at the north end of the claim these leave 
the porphyry and enter a greenstone-schist which here forms the 
country rock. The ledges are about 15 feet apart, average from 2 to 
6 feet in width, and have been traced over 2,000 feet along the surface. 
The ore is reported to carry $6 in gold per ton. 
Other prospects. — In the vicinity of Ketchikan and on Gravina 
Island are many other prospects more or less developed, and some with 
favorable ore exposures. A discussion of these, however, is not pos- 
sible in this brief summary. 
MARBLE. 
During the last few years much attention has been paid to the mar- 
ble deposits on the Prince of Wales Island. The largest of these is 
located close to tide water, 3 miles from Shakan on the northwest side 
of the island. The deposit has been developed by several open cuts, 
which expose a white, finely crystalline marble. Jointing planes and 
cracks are reported to occur in this rock which will prevent the mining 
of large slabs or columns, though its favorable location will probably 
make the deposit of value for building stones. 
At the head of North Arm, west of Dolomi, on the east side of 
Prince of Wales Island several claims have been located on a marble 
deposit similar in character to the Shakan deposit. It is exposed for 
a moderately large width and the marble is reported to be of good 
quality. 
