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 halaman |
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Halaman 17
... probably is at least 20 per cent . of the yield . Let us run this loss a little further . Suppose the two mills run 250 days in each year , which is not unreasonable , and we have a yearly loss in " float gold " alone , to say nothing ...
... probably is at least 20 per cent . of the yield . Let us run this loss a little further . Suppose the two mills run 250 days in each year , which is not unreasonable , and we have a yearly loss in " float gold " alone , to say nothing ...
Halaman 20
... probably $ 20,000,000 , a sum that would , with the ordinary supply of water , have been increased fully one - fourth . Owing to the introduction of improved machinery and modes of washing , as well as to the employment of more ...
... probably $ 20,000,000 , a sum that would , with the ordinary supply of water , have been increased fully one - fourth . Owing to the introduction of improved machinery and modes of washing , as well as to the employment of more ...
Halaman 23
... probably equal any known . At present something like 25,000 tons of pig - lead are annually imported into the United States ; but during the current year the Selby Works will supply nearly one - third of the whole amount , and it is ...
... probably equal any known . At present something like 25,000 tons of pig - lead are annually imported into the United States ; but during the current year the Selby Works will supply nearly one - third of the whole amount , and it is ...
Halaman 24
... probably , $ 250,000 . With it no further extended the sale of water would return the whole outlay in a very few years , with the chances of constantly increasing sales in the future . But the great amount of water owned by the company ...
... probably , $ 250,000 . With it no further extended the sale of water would return the whole outlay in a very few years , with the chances of constantly increasing sales in the future . But the great amount of water owned by the company ...
Halaman 27
... probably been found within four or five miles of this town . And I have no doubt that many more have been picked up and looked at and thrown away , the finders not knowing what they were . During my stay in El Dorado County I have seen ...
... probably been found within four or five miles of this town . And I have no doubt that many more have been picked up and looked at and thrown away , the finders not knowing what they were . During my stay in El Dorado County I have seen ...
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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 metal metallurgy 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