LODE MINING IN SOUTHEASTERN ALASKA. 63 
xposed. On the surface considerable investigations and improve- 
nents were also made. Two smelter shipments of ore were made 
luring the year, but this ore is by no means a smelting ore. It con- 
tains a high percentage of free gold and but a small proportion of con- 
centrates, and with careful amalgamation and separation it may be 
educed at small cost. 
REVILLAGIGEDO ISLAND. 
The Sea Level mine, on Thorne Arm, which was one of the first gold 
nines of the district and has been idle since 1903, was carefully exam- 
ned late in 1906, with the view of resuming operations early in 1907. 
The properties in the near vicinity of Ketchikan have all been closed. 
CLEVELAND PENINSULA. 
Mining and prospecting on Cleveland Peninsula hav been confined 
:o Helm Bay and Smuggler Cove, on the southwest end. Minerali- 
sation occurs in a narrow belt of schist and slate, and from this belt 
earns and pockets of rich free-gold ore have been mined. Though 
lumerous claims are located upon this belt, the only important work 
lone during the year was on the Gold Standard and Old Glory groups. 
At the former a 2-drill compressor plant was installed, besides explora- 
tory work underground. The 5-stamp mill on the property was 
reported in October to have been in operation for sixty days, crushing 
15 tons of ore per day. The richest ore is sorted out and shipped to 
the smelter. At the Old Glory group small developments were 
advanced and the ore obtained was treated in the 2-stamp testing 
mill on the property. 
WRANGELL MINING DISTRICT. 
Last year brought little progress in the mining enterprises of the 
fWrangell district. Late in the summer interest was revived on 
^W'oewodski Island by the Olympic Mining Company, and a renewed 
jattempt was to be made to mine and mill the ore from the several 
quartz lodes and veins on this company's properties. 
The mineral deposits are zones of brecciation in the greenstone 
country rock, from 5 to 15 feet in width, into which quartz has been 
generously introduced, carrying with it sulphide ores and small 
amounts of gold. But a small percentage of the ore is free milling, and 
as a whole the deposits are rather low in grade. 
Though there are many other prospects in the district there was no 
gold production and but little mining was done within the year. 
