Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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Halaman 18
... less . Reduce the ore dry through say No. 20 wire - cloth screens ; mix all thoroughly , then spread it out upon a floor about two inches thick . Lay it out in 12 - inch squares , take a smaller quantity from each square , take samples ...
... less . Reduce the ore dry through say No. 20 wire - cloth screens ; mix all thoroughly , then spread it out upon a floor about two inches thick . Lay it out in 12 - inch squares , take a smaller quantity from each square , take samples ...
Halaman 19
... less than from five to ten minutes . Can you save gold of this kind by running water down stream ? Again , can you obtain the gold of this fineness , without minute reduction ? Therein lies the secret of high assays before working , and ...
... less than from five to ten minutes . Can you save gold of this kind by running water down stream ? Again , can you obtain the gold of this fineness , without minute reduction ? Therein lies the secret of high assays before working , and ...
Halaman 21
... less , to- wards swelling the aggregate bullion product of the State ; and as several of them are already well advanced , with the prospect of being carried to an early completion , we may hope to soon enjoy the benefits of their co ...
... less , to- wards swelling the aggregate bullion product of the State ; and as several of them are already well advanced , with the prospect of being carried to an early completion , we may hope to soon enjoy the benefits of their co ...
Halaman 23
... less than 350 tons are under constant treatment , and this large amount will be increased to 500 tons before the close of the present year . The lead product of these works is admitted to be equal to any other in the Union ; and large ...
... less than 350 tons are under constant treatment , and this large amount will be increased to 500 tons before the close of the present year . The lead product of these works is admitted to be equal to any other in the Union ; and large ...
Halaman 24
... less water , Sacramento alone being counted upon for a net annual revenue of $ 50,000 . " The distance from the lakes in the Sierra Nevada to Sacramento is about seventy - five miles , and the total ditch and length of pipe to con- duct ...
... less water , Sacramento alone being counted upon for a net annual revenue of $ 50,000 . " The distance from the lakes in the Sierra Nevada to Sacramento is about seventy - five miles , and the total ditch and length of pipe to con- duct ...
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50 feet amalgam amount antimony arrastra assay average Bannack base bullion bed-rock bullion Calaveras County California CaƱon 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