Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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الصفحة 47
... limestone belt , and on the rivers during the short season of abundant water . The principal mineral resources of the southern mines , at the present time , are vein - mining in the gold - bearing quartz belts and gravel - mining on the ...
... limestone belt , and on the rivers during the short season of abundant water . The principal mineral resources of the southern mines , at the present time , are vein - mining in the gold - bearing quartz belts and gravel - mining on the ...
الصفحة 53
... limestone belt , in basins or flats where , from the nature of the surrounding country , drainage is impossible except by the construction of long and expensive tunnels . These gravel - beds , like the detrital matter in the foot ...
... limestone belt , in basins or flats where , from the nature of the surrounding country , drainage is impossible except by the construction of long and expensive tunnels . These gravel - beds , like the detrital matter in the foot ...
الصفحة 55
... limestone belt , and immense sums were taken from the flat . Rumor says that one claim fifty - five feet square yielded $ 100,000 , and that the total product of the flat was not much less than $ 2,000,000 . While any estimate of the ...
... limestone belt , and immense sums were taken from the flat . Rumor says that one claim fifty - five feet square yielded $ 100,000 , and that the total product of the flat was not much less than $ 2,000,000 . While any estimate of the ...
الصفحة 56
... limestone belt . - Placer mining . - Another prominent feature in the geology of this part of the country is the limestone belt , on which are found the early placers , noted for their immense yield from 1850 to 1855 . This belt runs ...
... limestone belt . - Placer mining . - Another prominent feature in the geology of this part of the country is the limestone belt , on which are found the early placers , noted for their immense yield from 1850 to 1855 . This belt runs ...
الصفحة 57
... limestone belt are deep , we find the towns of Mur- phy's and Vallecito , in Calaveras County , where mining is still prosecuted on a small scale by means of whims and pumps , with a fair profit , but the ground remaining to be worked ...
... limestone belt are deep , we find the towns of Mur- phy's and Vallecito , in Calaveras County , where mining is still prosecuted on a small scale by means of whims and pumps , with a fair profit , but the ground remaining to be worked ...
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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