Prospecting for Gold and Silver in North America |
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acid andesite Archæan Aspen assay basalt bed-rock beds blue limestone bodies boulders breccia Cambrian canyon carbonate Carboniferous carry clay COLLIERY ENGINEER color Colorado conglomerate containing copper country rock crater Cretaceous Cripple Creek crystalline crystals decomposed deposits depth diorite district dolomite drill ENGINEER AND METAL eruptive rocks fault feet feldspar fissure veins folds formed fossil fragments free gold galena gangue geological glaciers gneiss gold veins gold-bearing granite gravel gray copper gulch hard heat hills hornblende iron pyrites lava Leadville ledge lime limestone lode mass matter METAL MINER mica mines Mosquito range mountain occur outcrop oxidized Paleozoic pebbles phonolite planes PLATE porphyry portion prospecting prospector quartz quartz veins quartzite range region rich River rusty samples San Juan sand sandstones schists seams sedimentary shales Silurian silver slates sometimes strata stratified streams sulphide surface Tertiary thick true fissure tunnel valley volcanic walls whilst zone