174 SOUTHWESTERN NEVADA AND EASTERN CALIFORNIA. 
some chalcopyrite. The secondary ore is a porous yellowish lead 
carbonate with some malachite stains. The surface outcroppings are 
heavily stained by limonite. At another place a 4-foot vein of quartz 
lies between the gently dipping hornblende schist and the sericite 
schist and altered limestone above it. The quartz is free milling and 
heavily iron stained, and the crushed portions have been recemented 
by limonite. The writer traced the vein 200 feet, but it extends much 
farther. It is reported that one sampling across the vein gavi 
value- in gold averaging $1,500 per ton. At a third prospect a 
reversed fault cuts the schist member of the series, which here strikes 
X. 60° W. and dips 15° XE. A quartz vein 2 to 3 feet wide occupies 
the fissure. The quartz i- stained by limonite, and pyrite is the only 
original sulphide seen. Small nodules of native copper are. in rare 
instances, associated with the limonite stains. The ore is said lo 
assay from si:', to $500 per ton in free gold. The values are associ- 
ated with limonite. 
The prospects at Chloride ( Till' are either fissure fillings or deposits 
along contacts. In some cases the quartz and accompanying sul- 
phide- probably filled open fissures; in others the limestone was 
metasomatically replaced. There is a distinct tendency for galena to 
be the predominant sulphide in lime-tone, and pyrite in the other 
country rocks. Since the deposition of the quartz the veins have been 
crushed and surface waters have produced from the original sul- 
phides native gold, copper, cerussite, malachite, and limonite. The 
deposit- are structurally similar to those which hold their values well 
with depth, and if surface enrichment has not been out of all propor- 
tion to the original sulphide value-, further development is well 
justified. 
Water i> at present packet! on burro- from Keane Spring, 4 miles 
distant. Wood suitable for fuel occurs on the Amargosa Range, 10 
miles north of the prospects, but at present must be teamed by way of 
Bullfrog. A fair road connects the prospects with Bullfrog, the 
shipping and supply point. 
Ores from ;i number of mines in the Cambrian rocks in the vicinity 
of Chloride Cliff were examined, but the mines themselves were not 
visited. At the Keane Wonder mine a blanket vein of quartz, dip- 
ping gently westward, is said to lie along the bedding planes of the 
Cambrian rocks. The gold ore is quartz heavily stained by limonite 
and is said to be free-milling. The Trio mine, in the next gulch south 
of the Keane Wonder, i- -aid also to be on a quartz vein in the Cam- 
brian rocks. The ore is a limonite-stained quartz containing chal- 
copyrite and galena and some cerussite. Free gold is reported to 
occur in schist and limestone along a fault fissure down the gulch 
from Keane Spring. The ore of this deposit closely resembles that 
from the metasomatic replacement deposits of Chloride Cliff. The 
