Silver and Gold: an Account of the Mining and Metallurgical Industry of the United States: With Reference Chiefly to the Precious MetalsJ.B. Ford, 1873 - 566 من الصفحات |
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النتائج 11-15 من 95
الصفحة 68
... yield more than two dollars a day , and the unworked area is very limited . The best ground is cov- ered with ... yielding from $ 3 to $ 5 per day to the hand , but the available ground is now very limited . Yankee Hill , near the ...
... yield more than two dollars a day , and the unworked area is very limited . The best ground is cov- ered with ... yielding from $ 3 to $ 5 per day to the hand , but the available ground is now very limited . Yankee Hill , near the ...
الصفحة 70
... yield of placer mines has paled , we are content with the more resplendent glories of cement and quartz ; of the first , we are but in our infancy . " Throughout various parts of the county gravel diggings are found , and in several ...
... yield of placer mines has paled , we are content with the more resplendent glories of cement and quartz ; of the first , we are but in our infancy . " Throughout various parts of the county gravel diggings are found , and in several ...
الصفحة 71
... Yield of gold per day .. Height of gravel washed this year . Ground worked in the claim , total . Ground unworked ... Ground worked this year Number of men working . Wages paid to hired men per day , per man .. Composition of auriferous ...
... Yield of gold per day .. Height of gravel washed this year . Ground worked in the claim , total . Ground unworked ... Ground worked this year Number of men working . Wages paid to hired men per day , per man .. Composition of auriferous ...
الصفحة 72
... Yield of one cubic yard of ground Total yield of claim in one year . Wages paid to underground - drifters Number of men working . Composition of deposit from surface downward . Direction of channel .. Bed - rock ... 4 months . 42 feet ...
... Yield of one cubic yard of ground Total yield of claim in one year . Wages paid to underground - drifters Number of men working . Composition of deposit from surface downward . Direction of channel .. Bed - rock ... 4 months . 42 feet ...
الصفحة 73
... Yield of cement gravel washed Total yield last year ..... Total yield since commencement of this claim . Gold , description Wages paid to underground - drifters Number of men hired . Number of men working . Composition of deposit Bed ...
... Yield of cement gravel washed Total yield last year ..... Total yield since commencement of this claim . Gold , description Wages paid to underground - drifters Number of men hired . Number of men working . Composition of deposit Bed ...
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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