76 W.P. Blakeonthe Gold Region of California and Oregon. 
An occasional excitement is produced by glowing reports from — 
this locality, and according to recent accounts new placers have 
been found in the vicinity of Los Angeles. Although we are not 
yet aware of the extent of these placers, it may be safely asserted 
that they will not compare fal in area or richness with those 
of the Sierra Nevada. They are comparatively local in their ex- 
tent, but the region is worthy ‘of a careful examination. 
Gold of the Great Basin—Tulare Co.—Armagosa Mines. EB 
—A vein of auriferous quartz traverses one of the granite a : 
of the Great Basin vear the * neta trail to Salt Lake a 
¥ bent 170 miles from Los Angeles. The vein has been pro- — 
ted and attempts to work ‘ tiie been made by several com- 
panel Caen in San Francisco, but it is now abandoned. 
The- s fonnd in wire- like. filaments ramifying through 
quartz a nd earboat of lime. I have an interesting specimen in 
ig of gold traverses a rhombohedron of carbonate of 
lime and eentetl des from its opposite faces. The form was re 
duced to a rhombohedron by cleavage 
The occurrence of ‘gold in place, in one of the ridges of the 
Great Basin, so far remove an the Sierra Nevada gold field, is 
an important fact, and rendets it more than probable that exten-— 
sive placers will be found throm tits length and breadth. 
Colorado River—-San Diego Co.—It en frequently re- 
ported that gold exists along the Colorado river not far from Camp — 
Yuma at the mouth of the Gila. I could not obtain satisfactory. 
evidence of the truth of this statement; but if it does occur, it is — 
far from water and vegetation and prospectors are obliged to carry — 
the earth they wish to test many miles before water enough to 
wash it ont can be foun 
On the western sine: of the mountains between San Diego and — 
the desert, there are good indications of gold at several points — 
west of Santa Isabel and near the travelled road. The region is 
bd the attention of prospectors, 
Coast Mountains, Santa Cruz Range. —According to J. B. 
Trask,* gold has been found in the Coast meee. in the coul- 
ties of Monterey, Santa Clara and San Luis Obi 
AURIFEROUS QUARTZ.—Quartz veins are found in sila numbers 
traversing the slates, the granite and greenstone racks of various — 
portions of the Sierra Nev ada gold field; but comparatively few — 
of them have been worked to any extent: Among those that — 
produce the most interesting specimens, the following may be — 
oti : 
Co., Lafayette and Helvetia Mine.—Beautifal a : 
and ingiilar masses of gold are found imbedded in snow-while — 
quartz in this mine. They are frequently intimately associa 
Re on the Geol of 
I ag Beet eed the Coast Mountains. Sacramento. Senate Doc, 
