THE MINING INDUSTRY IN 1906. 27 
number of placer mines, but it is fair to presume that they include at 
least 1,200 different operations. In the absence of accurate informa- 
tion about tonnage and values for 1906 it seems worth while to make 
the following quotation in relation to the production of 1905: 
The tonnage of all the lode mines of Alaska in 1905 was 1,422,515 short tons, an 
increase of probably about 40,000 tons over 1904. Of siliceous ores 1,370,316 tons were 
mined, of which 1,296,271 tons must be credited to the three mines of the Treadwell 
group on Douglas Island, near Juneau, leaving only 74,045 tons as the product of the 
other gold-quartz mines. The average gold and silver value of all siliceous ores was 
$2.63 per ton. For the 74,045 tons of siliceous ores other than those from the Treadwell 
group it was $5.60. A total of 52,199 tons of copper ores contained an average of $1.66 
per ton of gold and silver, and copper to the amount of 4.61 per cent. It should be 
stated that the values of the siliceous ores mined thus far lie almost altogether in the 
gold, the silver values being often less than 1 per cent of the total. The high percent- 
age of copper is accounted for by the fapt that the Prince William Sound mines, which 
contributed a large percentage of the total tonnage in 1905, have so far shipped only 
high-grade ores. The copper percentage of ores from the Prince William Sound mines 
is nearly twice that of ores from the mines of southeastern Alaska." 
It can be added that the tonnage and values in the siliceous ore were 
probably about the same in 1906 as in 1905. The copper ores in 1906, 
however, showed an increase of at least 20 per cent, but the values 
remained about the same. 
LODE DISTRICTS. 
The southeastern Alaska districts are fully treated in other pages 
of this report. Prince William Sound and Copper Hiver were not 
visited by any member of the Survey and the following notes are 
compiled from various sources. 
The copper mines and prospects of Prince William Sound thus far 
discovered all fall within a zone about 10 to 20 miles in width stretch- 
ing northeastward from Latouche Island to Boulder and Galena 
bays on the mainland. An examination of the map (PI. I, p. 22) 
shows that much of this zone is under the water of the sound. As 
Grant 6 has shown, the ore bodies, chiefly chalcopyrite, occur as a 
rule along shear zones in the greenstone. 
Two mines, the Gladhaugh and Bonanza, made shipments of ore to 
the Tacoma smelter throughout the year, and several other proper- 
ties undergoing development also made some production. In the 
Gladhaugh mine a sixth level at 600 feet depth is said to have been 
reached. Though only a few properties have reached a shipping 
stage, there are probably two score that have been prospected during 
the past year. Most of this work was done on Latouche and Knight 
islands and at Boulder, Landlocked, and Galena bays. It is esti- 
mated that from 100 to 200 men have been almost continuously 
a Brooks, Alfred H., Mineral resources U. S. for 1905, U. S. Geol. Survey, 1906, p. 129. 
b Grant, U. S., Copper and other mineral resources of Prince William Sound: Bull. U. S. Geol. 
Survey, No. 284, 190G, pp. 78-87. 
