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40 acres Adjoining mines amphibolite andesite auriferous gravels automobile road average basalt bedrock Bibliography Bidwell Bar bornite Butte Valley Mining Calaveras formation Canon chalcopyrite channel claims copper country rock Crescent Mills crosscut Diller diorite dips Downieville drift driven Eureka Flat Mining District Folio 15 Folio 43 foot-wall Fork Feather River Genesee Valley granodiorite Greenville Grizzly hanging wall Hill Honey Lake Johnsville Keddie Lassen Peak lava Lindgren Location lode Meadow Valley meta-andesite meta-rhyolite miles north miles northwest miles south Mining Company Mountain North Fork Feather northeast oxidized Paper 73 placer Plumas porphyry present owners property consists proven length pyrite quartz quartz veins Quincy Mining ridge Round Valley Reservoir Sawpit Flat Mining schist serpentine shaft sheets Indian Valley slate slope southeast southwest Spanish Ranch stoped strikes stringers sulphides surface Survey Bull Survey Folio 37 Survey Prof Survey Topo Taylorsville thence U. S. Geol Valley Mining District wagon road width