. The copper resources of California. ins in the granite, and some of these are developed sporad-ically as bunches of white quartz (bull quartz). Copperhas been found at a number of points in the neighborhood,and the lodes are usually more or less parallel to the structureplanes of the inclosing rocks, but this is not the case with theGreenback lode, the general trend of which is across the east-west fracture system of the grano-diorite. About one mile KERN COUNTY—COPPKR MINES AM) CLAIMS. 239 southwest of the mine lies a hij;h cast-west ridge known asIron Mountain. The upper part of this ridge
. The copper resources of California. ins in the granite, and some of these are developed sporad-ically as bunches of white quartz (bull quartz). Copperhas been found at a number of points in the neighborhood,and the lodes are usually more or less parallel to the structureplanes of the inclosing rocks, but this is not the case with theGreenback lode, the general trend of which is across the east-west fracture system of the grano-diorite. About one mile KERN COUNTY—COPPKR MINES AM) CLAIMS. 239 southwest of the mine lies a hij;h cast-west ridge known asIron Mountain. The upper part of this ridge is composed ofa variety of rocks, some of which strongly resemble quartzite,but the slopes of the mountain are all of granitic are several cuts and shafts on the top of the mountainin the hard quartzite-like rock, but no strong indications ofcopper appear to ha\e been found, except on the north slope,just west of the line of .section 3, and on the south slope ofthe east end of the mountain, where some work is now being. ORKKXB.\CK COPPEK MINK. KIvKN COrNTV. done on a copper lode. vSeveral claims are located on thislode. At most of the points where copper has been found, thelode at the surface is composed of a gossan of rusty iron-stained material, often apparently rotten granite, generallysomewhat and not always showing copper croppings of the Greenback lode consist of altered granite,decomposed, and impregnated with iron oxide and at somepoints with copper carbonate, and there is more or quartzmixed with it. The Greenback lode has been opened by ashaft which inclines to the north about 60 degrees, and from 240 THK COPPER RESOURCES OF CALIFORNIA.
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