Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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الصفحة 47
... lode , as at Angel's Camp , Calaveras County , where this class of mining is extensively carried on , it is generally believed they are outlying " stringers " of the main lode . Copper mining . — An extensive belt of copper veins exists ...
... lode , as at Angel's Camp , Calaveras County , where this class of mining is extensively carried on , it is generally believed they are outlying " stringers " of the main lode . Copper mining . — An extensive belt of copper veins exists ...
الصفحة 48
... lode . - The Mother lode of California is a vein , or , more properly , a series of veins of quartz which has been traced on a longitu- dinal line , with occasional interruptions , for a length of about seventy- five miles , from Bear ...
... lode . - The Mother lode of California is a vein , or , more properly , a series of veins of quartz which has been traced on a longitu- dinal line , with occasional interruptions , for a length of about seventy- five miles , from Bear ...
الصفحة 49
... lode . Beyond the Cosumnes the lode is not traceable . 66 Between its southern and northern extremities it is frequently broken up and lost , ( invariably so at the intersection of the principal rivers , ) making its appearance again at ...
... lode . Beyond the Cosumnes the lode is not traceable . 66 Between its southern and northern extremities it is frequently broken up and lost , ( invariably so at the intersection of the principal rivers , ) making its appearance again at ...
الصفحة 50
... lode is the improvident manner in which work has been carried on , resulting in the exhaustion of the surface deposits , which were worked by open cuts at various places down to the water - line , when operations ceased until shafts ...
... lode is the improvident manner in which work has been carried on , resulting in the exhaustion of the surface deposits , which were worked by open cuts at various places down to the water - line , when operations ceased until shafts ...
الصفحة 58
... lode in May , 1872 . This cross - cut will give them three hundred feet of backs . This mine has always paid large ... lode is from 4 to 12 feet thick , and is traceable for miles through the country - is opened by an adit level ...
... lode in May , 1872 . This cross - cut will give them three hundred feet of backs . This mine has always paid large ... lode is from 4 to 12 feet thick , and is traceable for miles through the country - is opened by an adit level ...
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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