GOLDFIELD HILLS. 71 
In the rhyolite north of the east end ©f the copper belt are some 
prospects. The values reported are gold, and these deposits arc un- 
doubtedly late Tertiary veins. 
Water is hauled from Stonewall Spring, IT miles distant. Wood, 
except the almost valueless yucca, is equally distant. The Cuprite 
mines, however, are only 18 to 25 miles from the railroad at Goldfield, 
and ore may be shipped from the district at a comparatively low cost. 
Sulphur of good quality, said to occur in a vein in the rhyolite 
about three-fourths of a mile northeast of Cuprite, was examined. 
VALLEY NORTH OF SLATE RIDGE. 
. The valley north of Slate Ridge is connected by two narrow arms 
of gravels with Sarcobatus Flat and by a single similar arm with 
Stonewall Flat. The valley has an east-west extension and is of mod- 
erate grade. Pla}^as are situated in its eastern portion at elevations 
between 4,500 and 4,600 feet above sea level. Buttes of late Tertiary 
lavas are scattered over the lower portions of the valley. South of 
Mount Jackson a number of low white domes and dissected mesas of 
the older alluvium protrude from the Recent gravels, and the position 
jf the more important of these is shown on the map. The exposures, 
where examined, consist of stratified clay beds lying horizontally. 
The area immediately south of Mount Jackson is 300 feet above the 
lowest deposits in the valley, and this may be taken as the minimum 
:hickness of the formation, which is evidently a playa deposit of the 
)lder alluvium. The Recent gravels are probably thin throughout the 
yalley. Some water lies most of the year in a tank at Forks Station. 
GOLDFIELD HILLS. a 
TOPOGRAPHY AND GEOGRAPHY. 
The Goldfield hills are separated from the northeastern spur of 
he Silver Peak Range and the Mount Jackson hills by low mesas of 
)asalt and from the Southern Klondike hills and the Cactus Range 
>y low ridges of desert gravels. Most of the low hills and ridges 
[round Goldfield have a north-south trend, but some run east and 
vest. The highest summits are less than 7,000 feet above sea level. 
xcept for the usual desert shrubbery the Goldfield hills are bare. 
Several springs occur in the eastern portion of the hills, and a spring 
The ore deposits and geology of the Goldfield special area have already been de- 
cribed by Mr. F. L. Ransome (Bull. U. S. Geol. Survey No. 303). The map made by 
Ir. Ransome and his assistants, Messrs. G. H. Garrey and Wm. II. Emmons, has been 
eneralized and incorporated in PI. I, and the writer is indebted to these gentlemen for 
jiany suggestions as to the stratigraphy in these hills. The description here given 
ipplies mainly to the Goldfield hills beyond the area shown on the special map. The 
veology of these outer hills was studied practically without a topographic base, a fact in 
iart accounting for the shortcomings of the map. 
