64 ALASKAN MINERAL RESOURCES IN 1904. [bull. 259. 
Retta Inlet. — The Copper Mountain-Sulzer properties are on the 
south side of Hetta Inlet, a deep indentation in the southwest coast of 
Prince of Wales Island. The ore occurrences in this area, though 
rather widely scattered, are all of copper, with a few dollars per ton 
in gold values, and are remarkably similar in character. The ores 
are found principally along the contacts of a limestone, with either 
granite belts or diabase dikes. The original ores are principally chad 
copyrite, pyrite, pyrrhotite, and magnetite, with quartz, calcite, gar- 
net, and epidote, as gangue minerals. In many of the deposits surface 
oxidation has altered the sulphides to a considerable depth and formed 
carbonate and oxide ores. 
Alaska Copper Company.— At the Alaska Copper Company's prop- 
erty, on the south slope of Copper Mountain, development follows a con- 
tact of granite with limestone and shows the usual contact phenomena. 
This ledge, known as the "New York," is located at an elevation ofj 
3,300 feet near the summit of a steep mountain slope, and is exposed 
by large open cuts and short tunnels. At 2,400 feet elevation a tun- 
nel, already 1,400 feet in length, is being driven to undercut the ledge 
below the surface workings, and this purpose was almost accomplished 
at the time the property was visited. A few thousand feet east of 
the New York ledge is the Oregon ledge, which is over a hundred 
feet in width, but of lower-grade ore. This has not as yet been devel- 
oped. The extent and final average value of the ore can not be deter- 
mined from the present indications. However, the surface showings 
appear to justify a continuation of the proposed developments. A 
250-ton smelter has just been completed, a water-power plant sufficient] 
for all purposes has been built, besides a 5,000-foot-cable tram from 
the uppermost workings to the smelter. 
Alaska Industrial Company. — Two large groups of claims are being 
developed Iry the Alaska Industrial Company, namely, the Jumbo 
group of 29 patented claims, on the north slope of Copper Mountain, 
and the Green Monster group, 6 miles east of Copper Mountain. On 
each of the above groups several copper-bearing ledges have been 
exposed by tunnels and open cuts, and on some there are large surface 
exposures of rich chalcopyrite ore. On the Jumbo claims diabase ana 
limestone are in most cases the inclosing rock. At the Green Mon- 
ster group the deposits are more often at or near the granite limestone 
contact. As yet neither mining nor water-power plants have beer] 
built, though these will probably follow when further mine develop- 
ments bring to view sufficiently large ore deposits to warrant such 
construction. 
COLD. 
Though gold is not extensively mined in the region under discussion 
it has been sought in many localities. Work beyond the annual assess 
ment requirements has been done only at Dolomi, on the southeast side 
