Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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النتائج 11-15 من 62
الصفحة 70
... limestone range in the river by means of a derrick and horse - power , getting good pay . Worthman claim is a tunnel claim now ; formerly a hydraulic claim ; still yielding well . Driscol & Co. are cutting a tail - race and 70 MINING ...
... limestone range in the river by means of a derrick and horse - power , getting good pay . Worthman claim is a tunnel claim now ; formerly a hydraulic claim ; still yielding well . Driscol & Co. are cutting a tail - race and 70 MINING ...
الصفحة 77
... limestone belt , and the characteristics of the placers do not materially differ from those of Co- lumbia and vicinity , already described , except that here long bed - rock cuts and tunnels have been run to open and drain the flats and ...
... limestone belt , and the characteristics of the placers do not materially differ from those of Co- lumbia and vicinity , already described , except that here long bed - rock cuts and tunnels have been run to open and drain the flats and ...
الصفحة 78
... limestone cave . This cave was dis- covered by accident , in 1850 ; but on account of its nearly inaccessible situation it has been rarely visited and never thoroughly explored . The length of the explored passages is about 1,500 feet ...
... limestone cave . This cave was dis- covered by accident , in 1850 ; but on account of its nearly inaccessible situation it has been rarely visited and never thoroughly explored . The length of the explored passages is about 1,500 feet ...
الصفحة 79
... limestone belt , a few miles south of Railroad Flat . There are nu- merous promising quartz - ledges near this town which are but little de- veloped . George Rodocino is engaged in running a tunnel on a ledge 10 to 12 feet wide . The ...
... limestone belt , a few miles south of Railroad Flat . There are nu- merous promising quartz - ledges near this town which are but little de- veloped . George Rodocino is engaged in running a tunnel on a ledge 10 to 12 feet wide . The ...
الصفحة 89
... limestone range . Its mines have been worked continuously since 1849 . The Amador County Canal and Volcano ditch , both of which are owned by San Francisco capitalists , supply the district with water . They take their supply of water ...
... limestone range . Its mines have been worked continuously since 1849 . The Amador County Canal and Volcano ditch , both of which are owned by San Francisco capitalists , supply the district with water . They take their supply of water ...
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50 feet amalgam amount antimony arrastra assay average Bannack base bullion bed-rock bullion Calaveras County California Cañon carbonate cent chemical claim coal commenced company's contains copper cost County course Creek Cupellation December deposits depth developed district ditch drift drill east El Dorado County engine erected Eureka expense extracted feet deep feet in length feet long feet wide furnace galena gangue gold Gold Hill gravel ground Gulch Hill hundred hydraulic inches incline iron labor lead ledge limestone located lode metallurgy metals miles mill miners Mining Company months nearly Nevada opened operations ounces owners placer mines pounds present Professor prospecting quantity quartz quartzite rich River rock San Francisco silver slag slate smelting smelting-works stamps stopes sulphurets sunk supply surface Table Mountain tailings thick tion tons Total tunnel Tuolumne County tuyeres Valley vein width yield