256 ECONOMIC GEOLOGY OF SILVERTON QUADRANGLE, [bull. 182. 
present adit; while a second tunnel, about 700 feet in length in Sep- 
tember, L900, is being driven from the mill at Gladstone. This will 
eventually tap the lode about 1,500 feet below the present workings. 
The ore is carried down to the mill at Gladstone on a well-built 
Bleichert wire-rope tramway, running from 300 to 400 buckets of 700 
or 800 pounds per day. A second tramway is being built to the Amer- 
ican tunnel. The mill is equipped with a Gates crusher, 80 stamps, 
and 4<> Frue vanners. Power is supplied by a 250-horsepowcr West- 
inghouse engine. The free gold is amalgamated, but the bulk of the 
product is in the concentrates, which are shipped to the smelter. The 
owners of the Gold King built and control the narrow-gauge railway 
from Silver ton to Gladstone. 
Tungsten ore deposits. — The Adams claim, which has for several 
years furnished cabinet specimens of the tungstate hubnerite, lies on 
the western slope of Bonita Peak at an elevation of about 11,300 feet. 
The hubnerite occurs in a lode which strikes N. 10° E. and dips east 
about 85°. In the main it is a sheeted zone 3 or 4 feet wide, in altered 
andesite of the Silverton series, the fissures being filled with quartz 
and fluorite. The individual stringers or veinlets of the lode are 
rarely more than (3 inches wide and are adherent or "frozen" to the 
walls. The hubnerite does not occur in all portions of the lode, but 
in isolated and irregular bunches, streaks, or nests of bronze-brown 
radial crystals embedded in quartz and fluorite. The development of 
this deposit is very superficial, consisting of a short tunnel and some 
open cuts, and the tungsten ore has never been worked on a commer- 
cial scale. The prospect was evidently opened in search of other ore, 
as the hubnerite lias been thrown with the waste on the dump. 
In Dry Gulch hubnerite occurs in a strong lode, on which have been 
located the Dawn of Day, Sunshine, and Minnesota claims. This 
lode has a course of about S. 00° E. and dips southwest at 65°. Sev- 
eral prospecting openings have been made on it on the south side of 
the gulch. One of these shows a solid vein of quartz 3 or 4 feet wide 
in Silverton andesite. The hubnerite occurs in the quartz in two or 
three small streaks, from 1 to 3 inches wide, and in small isolated 
bunches. The crystals are smaller than those in the Adams lode. 
Owing to its weight (sp. gr., 7.2) and its occurrence in otherwise 
nearly barren quartz and fluorite, the hubnerite of Cement Creek can 
be readily and cleanly concentrated. Some 5 tons of concentrates 
have been produced from the Dry Gulch claims; but whether the 
material occurs in sufficient abundance and in sufficiently continuous 
bodies to pay for mining is a question not yet decided. 
In its occurrence the hubnerite is purely a vein mineral, occurring 
in a quartz or quartz and fluorite gangue, as do galena, pyrite, and 
other ore minerals of the region. 
Red and Bonita mine. — The adit tunnel of this mine runs in an 
easterly direction into Bonita Mountain, from a point about 100 feet 
above Cement Creek. About 3,000 feet of work has been done from 
