66 ALASKAN MINERAL RESOURCES IN 1904. [bull. 259. 
caverns. On another near-by ledge a shaft has been sunk to a depth 
of 80 feet. The present 5-stamp mill is to be enlarged to a 15-stamp 
mill during the winter. 
Hull is. — The bed rock in this vicinity is composed mainly of crystal- 
line limestones and carbonaceous slates with intercalated sills of green- I 
stone, both massive and in part altered to chlorite or amphibole- schists. 
Parallel to and slightly cross-cutting the slates are dikes of a bluish- 
gray porphyritic rock, in or near which the ore deposits occur as true 
fissure veins. 
The properties which have received the most attention are the Puy- 
allup group, li miles west of the bay, and the Crackerjack mine 
with its southeastern extension, the Hollis claim, 2 miles west of Hollis. 
The first mentioned, the Puyallup claim, consists of a rich quartz- 1 
filled fissure, from 4 inches to 2 feet in width, cutting diorite-porphyry I 
country rock. This has been developed by two tunnels, the lower one I 
1,135 feet long, the upper 220 feet long. At the end of the longer I 
tunnel the vein has been lost and has not as yet been rediscovered. J 
On the property a 5-stamp mill treats the ore, and 85 per cent of the j 
gold is found to be free milling. 
The vein which is worked on the Crackerjack claim lies principally 
along the upper contact of a porphyry dike cutting the schist, though 
in places it enters the porphyry. The slate is more or less graphitic . 
and finely bedded. It strikes N. 25° W. and dips southwestward at 1 
an angle of 35°. The porphyry dike is in the main parallel with the I 
bedding of the formation, and varies from 2 to 20 feet in width. It 
is said that this ledge, which varies from 1 foot to 5 feet in width, J 
maybe traced on the surface for more than 3 miles. The values,! 
chiefly free gold with pyrite, are found in ore shoots parallel to the 
dip of the ledge. The deposit has been opened by an 800-foot tunnel 
at an elevation of 800 feet above tide water, and a second tunnel of 1 
about one-half that length. An average value of $15 per ton is 
reported. On the extension claims above this are two tunnels, one I 
120 feet and another, at an elevation of 1,450 feet, 400 feet in length. 1 
In each of these the conditions of occurrence are similar to those j 
above mentioned, and the character of the veins is very uniform. 
About 7 miles northwest of Hollis are located the Commander group, ] 
Flora Nellie, Dew Drop, Red Jacket, Summit, and Rose claims, which I 
are still in the prospecting stage. The quartz ledges here average I 
from 2 to 4 feet in width, and are quartz-filled fissures following slip- 1 
ping planes in a porphyry dike which in places has been rendered! 
schistose. Ore from the various tunnels, essentially galena, pyritej J 
and chalcopyrite, is reported to average from $25 to $50 per ton, and 
with more favorable transportation facilities these properties may 
make profitable mines. 
