GOLD MOUNTAIN RIDGE AND HILLS NEAR BY. 
eates a less close connection with waters of the granitic magma. 
Water appears to have filled a most complex zone of fracture with 
quartz and sulphides, the gold probably being originally contained in 
pyrite. Later oxidizing waters attacked the sulphides and altered 
them to oxides and carbonates, setting the gold five. These waters 
apparently carried some silica in solution, which was deposited as 
chalcedony. 
The mines in the vicinity of Old Camp are situated near water 
sufficient for mining and milling purposes. Timber for fuel and 
mining use is standing within 2 or 3 miles. The railroad terminus 
at Goldfield is 35 miles distant. 
TOKOP. 
Tokop is 4 miles in an air line northeast of Old Camp and 25 miles 
by road west of south of Goldfield. The properties c f the Gold Crest 
Mining Company, situated three-fourths of a mile south of Tokop, 
were examined in some detail. On the Ouida claim a vertical vein 
cuts the Cambrian garnet-quartz-epidote rock, which strikes N. 10° 
E. and dips 20° W. This vein is H feet wide and strikes N. 80° W. 
The quartz of the vein, which is white and semitransparent, has been 
intensely crushed, and the fragments have been cemented by hema- 
tite and limonite. Dendrites .of manganese oxide also occur. Some 
portions of the quartz are compact, with here and there an iron- 
pyrite cube unaltered, while other portions have a few vugs lined with 
quartz crystals or are honeycombed with iron-pyrite casts. From 
the fact that the compact varieties are refractory and the honey- 
combed varieties are free-milling, it is evident that the gold was set 
free by the alteration of the pyrite. A mashed greasy phase of the 
garnet-quartz-epidote rock on one side of the vein is said to pan, but 
whether pyrite originally occurred in the metamorphosed limestone 
or whether the values were derived from the surface alteration of 
the quartz vein is unknown. 
Angular fragments of altered limestone and shale are common 
near the borders of some veins. In such places silicification has ex- 
tended into the limestone, and these belts, like the quartz veins, 
Aveather in relief. Such veins grade into sheared and brecciated 
zones of silicified limestone, and these again are reported to carry 
values, 
Another vein is similar to the vertical vein first described, but the 
shattered quartz is cemented by a gray chalcedonic quartz. Still 
another, at first sight, appears crustified, but close inspection shows 
that the appearance is due to a longitudinal fracturing of the vein 
and subsequent filling by limonite and chalcedonic quartz. Both 
forms of quartz are said to assay, but the earlier quartz appeal's to 
carry both the sulphides already mentioned and slight amounts of 
