Bansome.] AREAL DISTRIBUTION OF THE LODE ORES. 95 
sort referred to at the beginning of this section is afforded by the 
Little (riant lode, on the north side of Arrastra Gulch, which pro- 
duced a free-gold ore. 
In Maggie Gulch the greater number of the lodes contain siliceous 
ores, of which thai of the Ridgway mine maybe taken as the general 
type (PI. X., A). In these ores the quartz is finely crystalline and 
the ore minerals occur as minute dark specks, which, when abundant, 
give thegangue a dark, clouded appearance. In the Ridgway, the only 
mine working these ores on a commercial scale, the ore particles are 
chiefly argent ilc. Bui in other cases they are galena, and apparently 
not always very argentiferous. The erroneous belief of the pros- 
pectors thai these minute ore particles are nearly always "brittle 
silver" lias in some cases resulted in much fruitless labor. In one 
instance a prospecting tunnel of considerable length was being run 
on expectations excited by a few minute bunches of "brittle silver," 
which were in reality worthless specularite. Ores generally similar 
to tlu>se of Maggie Gulch occur at various points in the northeastern 
part of the quadrangle, particularly in the vicinity of Mineral Point. 
In Sunnyside Basin and a1 the head of Placer Gulch the ores are 
commonly of moderately coarse crystallization and carry abundant 
galena,, sphalerite, and chalcopyrite. They are almost invariably 
associated with abundanl rhodonite. Of low grade as a whole, they 
sometimes contain bunches of rich ore, which, in the Sunnyside Exten- 
sion mine, are known to have carried, in carload lots, as much as 74 
ounces of gold per ton, mostly i'v^r. The ore of the Sunnyside mine 
may he considered as typical of this district. 
In Poughkeepsie Gulch the ores partake somewhat of the charac- 
teristics of those of the Sunnyside Basin and of Mineral Point. But 
their most characteristic feature appears to have been in the occur- 
' rence of t he lead and silver in some combination with bismuth, usually 
as an argentiferous sulphobismuthite of lead. The ore of the Alaska 
mine is a well-known example and has been described on page 195. 
In the extreme northeast corner of the quadrangle maii3 T of the 
prospects and some of the mines formerly worked are characterized 
by argentiferous copper ores, usually chalcocite or bornite, with some 
galena and chalcopyrite. 
What may conveniently be termed the Red Mountain Range, 
embracing the region bounded by Cement, Grey Copper, and Mineral 
creeks, is characterized by the predominance of the stock deposits 
and their peculiar ores, which will be described in subsequent pages. 
Lastly, in the northwest corner of the quadrangle, ores carrying 
much galena, and recalling in some of their features those of Silver 
Lake Basin, are associated with gold ores such as those of the Camp 
Bird and Tomboy mines. 
As far as could be determined, the distribution of ore types as briefly 
sketched in the foregoing paragraphs is purely areal and is not 
