^8 ALASKAN MTNERAL RESOURCES IN 1906. 
At this depth, 220 feet below the adit tunnel, drifts were extended to 
the northwest and southeast along the vein and the ore thus developed 
was mined. 
In 1906 operations were begun the first of May and discontinued in 
October, and during this period the. 10-stamp mill on the property 
was operated without interruption. 
At the other mines within the Berners Bay region no additional 
developments have been made, principally because of litigation diffi- 
culties. The nature of the ore deposits and mine developments at 
these points was discussed in last year's report. 
MINES SOUTH OF JUNEAU. 
Mining progress during the last year has been very slight along the 
mainland belt to the south of Juneau. None of the mines or pros- 
pects have been extensively worked, and their production has been nil. 
At Taku Harbor and Limestone Inlet gold-bearing veins of excep 
tional promise are said to have been opened up during the year, but 
little work was done on them. At Port Snettisham the only work 
reported was on the Crystal mine. Here the quartz ore was being 
mined in a small way and milled in the 5-stamp mill on the property, 
yielding profitable returns. No noteworthy improvements were made 
on any of the other prospects about this inlet. 
To the south the Holkham Bay group of claims, located on the 
south side of Endicott Arm, is reported to have been sold, and a small 
crew of men are to be employed during the winter to drive a 400-foot 
tunnel, which will develop the vein in depth. The ore body is a min- 
eralized quartz lode, in a schist country rock, within 2 miles of the 
main Coast Range intrusive belt. The ore minerals are galena, 
arsenical pyrite, pyrite, and small" particles of chalcopyrite, all of 
which occur both in the quartz veinlets and inclosed in fragments of 
country rock. Sixty per cent of the gold content is said to be free 
milling, and the concentrates contained in the ore are estimated at 
2 per cent. At 1,800 feet elevation a tunnel undercuts the lode 175 
feet from its mouth, and from this point nearly 200 feet of drifting 
has been extended. Other improvements consist mainly of surface 
cuts exposing the lode at various points along its strike. 
At the Sumdum mine, in Holkham Bay, no attempt was made to > 
renew operations, which were discontinued in 1904. 
At most of the properties at the head of Windham Bay, which were 
energetically developed during 1902-3, operations were discontinued 
soon after that time. The only company which carried on active 
work in 1906 was the Helvetia Gold Mining Company. Long cross- 
cut tunnels have been driven into the mineralized belts of schist, and 
a Wright, F. E. and C W., Lode mining in southeastern Alaska: Bull. U. S. Geol. Survey No. 
1906, pp. 31-34. 
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