342 TRANSACTIONS OF THE 



CKAhCOP YmTE—(YeUoio Copper Ore.) 



This is the chief ore of the copper mines of California, as it is lilcewise 

 of the mines of Cornwall, England. It is therefore found at a great 

 number of localities, along the copper bearing belt which stretches in a 

 nearly unbroken zone from Mariposa County northw^esterly to Del Norte 

 Count}^, parallel with and on the western side of the chief gold produc- 

 ing belt of the State. 



In Calaveras Gounti/ the chief localities (for the massive ore) are: The 

 Union, Keystone, Empire, Napoleon, Campo Seco, and Lancha Plana 

 Mines. In good crystals implanted on and among clear quartz crystals, at 

 the Noble copper claim on Domingo Creek. — (Collection of Dr. Jones, Mur- 

 phy's.) In 3Ianposa Comity, the La Victoire Mines, in Hunter's Valle}', 

 and Haskell's claims, below Mariposa Town, and claims along the Chow- 

 chillas Eiver. Amador County, at the Newton Mine. El Dorado Counfy^ 

 at the Cosumnes Mine, Hope Yalley Mine, at the Bunker Hill Mine, El 

 Dorado Excelsior, and other claims at and near Pilot Hill. Flumas 

 County, at the Genesee and Cosmopolitan Mines. It occurs also, in small 

 quantities, in Contra Costa County, in the rocks of Mount Diablo, and in 

 those of the Coast Mountains, south and north of San Francisco. In Los 

 Angeles County, at Eichmond District, and at Big Meadow District, both on 

 the interior slope of the mountains at the margin of the Great Basin. — 

 {Vide Geol Rec. Cat, p. 290.) 



Lower California, a few leagues south, of San Diego, at the "Winder 

 claims. 



Arizona, at the Apache Chief Mine, after getting below the "surface" 

 ores. At the San Pedro Mines, near Fort Buchanan Near Caborca, in 

 northwestern Sonora. 



CHLOEIDE OF SILVEE. 



At the mines about Austin, Lander County, Nevada, this species is abun- 

 dant in the surface ores, being derived from the decomposition of the 

 mixed sulphurets of silver below the water level. It was also found in 

 the decomposed ores of the upper portions of the Comstock lode, and is 

 common to all the silver veins of the Great Basin. Soine remarkably 



fine specimens were obtained at the mine in Slate Eange District, 



California. Occurs also in the Willow Springs District, and in the veins 

 of El Dorado Canon, Arizona. 



CHEYSOCOLLA— (.SiYrca^co/ Copper >) 



Not common in California, where the sulphurets in decomposing give 

 carbonates and oxyds; but in Arizona, along the Colorado Eiver, very 

 common at and near the surface, where the veins containing copper 

 glance are decomposed. Fine specimens were taken from the Great 

 Central claim, about twenty miles from La Paz, and at the Blue lode. 



CHEOMIC lEON. 



Monterey County, in masses, with green crusts and coatings of emerald 

 nickel, ^anta Clara County, near the North Alniadcn Mine. 



