PANAMINT RANGE. 211 
ECONOMIC GEOLOGY. 
No mining camp exists in the portion of the Panamint Range in- 
cluded in the area under consideration. Harrisburg lies near the 
Emigrant Spring-Ballarat road, about 6 miles south of the boundary. 
Assays reported by prospectors indicate that gold-bearing copper ores 
occur in the quartz monzonite and silver-bearing galena ores in the 
limestone areas. 
Goldbelt, a deserted camp, is situated at the Goldbelt Spring, near 
the contact of the Pogonip limestone, here marmorized, and the quartz 
monzonite. A number of men are said to have rushed to this camp 
in the spring of 1905, but little work was done. The more important 
development work was on certain thin veins or lenses in the quartz 
monzonite. The ore contains a little chalcopyrite, probably a portion 
of the original sulphide unaltered. Of later origin are malachite, 
chrysocolla, and a dark-brown or black, iron-stained, flinty chalced- 
ony, of approximately contemporaneous age. These minerals are 
coated with small quartz crystals. This ore is said to have panned 
free gold. Similar ore is reported from other localities in this mon- 
zonite area. A specimen from a vein near the source of Cottonwood 
Creek consists of dark limonite-stained jasperoid and chrysocolla, in 
which, occur radial crystals of bottle-green brochantite. This also is 
reported to pan gold. In the soda-syenite mass GJ miles southeast of 
Tin Mountain thin veins of limonite, presumably after iron sulphide, 
occur. 
The areas most favorable to prospecting for precious metals are 
the Cambrian rocks of Tucki Mountain and the Pogonip limestone 
in the vicinity of the quartz-monzonite mass. Quartz veins, usually 
of lenslike form, are common on Tucki Mountain. They reach an ob- 
served maximum width of 3 feet and usually appear barren, although 
in some instances they have been crushed and are heavily stained by 
limonite and hematite. It is said that an old lead mine was at one time 
worked on this mountain, and several promising camps in the Aniar- 
gosa Range are situated on similar veins in the same rocks. Veins 
of two ages in the Pogonip limestone are formed of barren-looking 
calcite. Some occupy overthrust fault fissures, and these are faulted 
by other veins. The older veins are composed of massive crystalline 
calcite ; the younger are often beautifully crustified. On the Cotton- 
wood Canyon trail magnificent calcite veins 1 feet wide occupy fault 
fissures. The crustified calcite curves around included fragments 
of limestone in concentric bands. Near the quartz-monzonite m;i sse- 
j) few small quartz veins occur and some of these contain pyrite. En 
other portions of the area surveyed ore-bearing veins have been found 
in limestone near granite contacts, and by analogy they probably 
also exist near the related monzonite. At a number of places in tin 
