AMARGOSA RANGE, ECONOMIC GEOLOGY. 173 
trike faults having the same strike are common in the vicinity of 
Thorp's mill and form numerous fault scarps. The Siebert lake beds 
outh of the Staininger ranch have been flexed and are broken by 
mall normal faults of north-south strike. 
Unimportant folding and faulting are recorded in the basal! and 
!>lder alluvium areas. The basalt below the Staininger ranch dips to- 
fed Death Valley and has apparently been tilted westward along a 
orth-south axis. Normal faults of 4 to 5 feet displacement, usually 
rith north-south trend, cut the basalt in the vicinity of Grapevine 
Canyon. The older alluvium at Hole in the Rock Spring for the most 
)art dips toward Death Valley, although northeasterly dips here and 
here indicate that since the deposition of the conglomerate the range 
las not only been uplifted, but also somewhat folded. 
ECONOMIC GEOLOGY. 
Active mining operations are being caried on at three points in the 
Vmargosa Range within the area mapped — at the Happy Hooligan 
nine, at Chloride Cliff, and at Lee's Camp. 
HAPPY HOOLIGAN MINE. 
The Happy Hooligan mine is situated at the eastern base of the 
Grapevine Mountains, 9 miles northwest of Bullfrog. A number of 
est pits have been sunk at the contact of the eroded surface of the 
Pogonip limestone, with its interbedded quartzite and the Tertiary 
lava flows. The predominant lava is a kaolinized rhyolite, from 
which the feldspar phenocrysts have been largely removed by 
weathering. This is underlain by a flow of basalt which rests upon 
the limestone. At the contact with the limestone the basalt is reddened 
by hematite and altered to a greasy substance, which pans fine free 
gold, as does the limestone when decomposed. Gold values also 
occur where the lava comes in contact with the quartzite. The con- 
tact has been traced several hundred feet and values are reported 
from all the test pits. The ore is free milling, and no sulphides were 
observed. It is said to run $40 in gold per ton, the values appearing 
to be closely associated with limonite and hematite. Several springs 
are situated near the mine and fuel can be obtained within 6 miles. 
The road to Bullfrog is rather heavy. 
CHLORIDE CLIFF. 
Chloride Cliff is situated in Inyo County, CaL, on the crest of the 
Amargosa Range, 15 miles south of Bullfrog. At this point the 
Cambrian limestone strikes N. 15° W. and dips 30° E. A steeply 
inclined fault trending N. 50° W. cuts the limestone. The limestone 
along the fault is silicified and in it are disseminated galena and 
