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 18
... quartz : That there has been still too great a wastage of precious metal , all admit ; not only is this in our gold in gold mining , but in the silver associated with the gold . This fact is not generally understood , as California ...
... quartz : That there has been still too great a wastage of precious metal , all admit ; not only is this in our gold in gold mining , but in the silver associated with the gold . This fact is not generally understood , as California ...
Halaman 26
... quartz . Many of these seams are rich in free gold , and having become thoroughly decomposed through chemical and elemental action , the metal has been liberated from its matrix , and they , together with the inclosing slates , can now ...
... quartz . Many of these seams are rich in free gold , and having become thoroughly decomposed through chemical and elemental action , the metal has been liberated from its matrix , and they , together with the inclosing slates , can now ...
Halaman 27
... quartz and other crystals , are very often curved , the center of each face being a little higher than the surface toward the edges . The diamond , moreover , is extremely hard , and scratches quartz with the greatest ease . If ...
... quartz and other crystals , are very often curved , the center of each face being a little higher than the surface toward the edges . The diamond , moreover , is extremely hard , and scratches quartz with the greatest ease . If ...
Halaman 31
... quartz mining . It will be observed that during the past three years ( 1868 , '69 , '70 , ) the aggregate rain - fall has been only 38.68 inches , which is but little more than that of many single years , and much less than fell in any ...
... quartz mining . It will be observed that during the past three years ( 1868 , '69 , '70 , ) the aggregate rain - fall has been only 38.68 inches , which is but little more than that of many single years , and much less than fell in any ...
Halaman 32
... Quartz crushing machinery . - In quartz - mills there has been one inven- tion which possesses the merit of novelty in the application of crushing power . This is a trip hammer quartz - crusher , invented by Mr. J. D. Crocker , of ...
... Quartz crushing machinery . - In quartz - mills there has been one inven- tion which possesses the merit of novelty in the application of crushing power . This is a trip hammer quartz - crusher , invented by Mr. J. D. Crocker , of ...
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50 feet amalgam amount antimony arrastra assay average Bannack base bullion bed-rock bullion Calaveras County California Caņon 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