190 SOUTHWESTERN NEVADA AND EASTERN CALIFORNIA. 
galena as noted in other veins. It may be that the chalcedonic quartz 
appears to carry values simply because sufficient care has not been 
taken to eliminate the older quartz from samples. 
Limonite, hematite, cerussite, free gold, and a little malachite were 
observed as secondary minerals. Probably some chalcopyrite exists 
at greater depths. One of the last changes which these ore deposits, 
like those of Old Camp, have undergone is the local deposition of a 
thin film of bluish-white chalcedony. 
The contact of the granite and limestone here probably has locally 
a rather gentle dip, and deep mines in limestone near the contact may 
encounter granite. Mr. Joseph Mackedon, the manager of the Gold 
Crest Mining Company, states that in several prospect holes the 
quartz veins have past from metamorphosed limestone to granite 
without diminution in size <>r value. From the striking resemblance 
of these veins to those of Old Camp this is to be expected. 
Similar vein- of iron-stained quartz carrying gold values occur at a 
number of place- in metamorphosed Cambrian rocks around Tokop. 
Waters carrying silica and metallic salts in solution appear to have 
deposited these substances in strong fractures which extend, in some 
cases, at least, into the granite. The country rock was to a less extent 
impregnated. The quartz veins were subsequently crushed and iron 
oxide and chalcedonic silica were deposited in the fractures. Simul- 
taneously, probably, iron pyrite was dissolved and the gold set free. 
Water and wood for mining and domestic purposes are near at 
hand, and the distance to the railroad at Goldfield is 25 miles. The 
Rattlesnake mine, near the properties described, appears to be in the 
same rock formation, and its ore deposits and those of Tokop are said 
to be similar. Eight or ten years ago the Rattlesnake produced 
$150,000, and recently it has been reopened. The veins of Tokop, like 
those of Old Gamp, seem strong and will probably be permanent to 
such depths as mining is possible. With depth, however, the ore will 
become refractory and may become leaner. 
ORIENTAL WASH. 
Several prospects, now abandoned, are located in the altered lime- 
stone west of the granite area at the west end of the Gold Mountain 
ridge. At one prospect a thin quartz vein cuts the limestone. Mala- 
chite, azurite, chrysocolla, and limonite-stained chalcedonic quartz 
occur in irregular patches and veinlets through the quartz. Vugs 
occur in the secondary minerals, and the azurite and malachite are in 
places covered with numerous quartz crystals. A little chalcopyrite 
is embedded in the oldest quartz and cores of chalcopyrite are sur- 
rounded by the secondary copper minerals. A vein of malachite 1 
inch in width, apparently replacing the limestone, is exposed in 
another prospect. At still another prospect, in association with mal- 
