of Gold in Calaveras county, Cal. 93 
ton of ore. This search for copper has, however, opened up 
these deposits so as to display their character in a conspicuous 
manner. 
strike and easterly dip of the region. All this mass of mate- 
tint, and staining the rocks with brilliant colors, a peculi- 
arity which the miners have characterized by the name of 
“Calico rocks.” This decomposition or oxydation of the sul- 
able to the line of strike. But the decomposition which 
affected other portions of the ore channel appears also to have 
changed them, for they are found to be reduced completely to 
the condition of kaolin and lithomarge, or kindred alterations 
per ores seem to have been confined to a portion of the de- 
found in all the outcrops both in the quartz and in the ‘ calico 
tocks’ resulting from the decomposition of feldspathic and tal- 
se or chloritic constituents. ae 
Accompanying the entire mass of decomposition at both 
localities occur both gold and silver, disseminated with remark- 
able uniformity in all parts of the ore-bearing ground. At 
Whiske Hill, films of metallic silver are visible upon the be 
-Cose-masses stained green by malachite or chrysocolla 
