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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الصفحة 21
... course of a few months and be able to maintain themselves permanently at this advance . English promoters have made the further mistake of exacting an inordinate commission for their services , necessitating the holders of mines to ...
... course of a few months and be able to maintain themselves permanently at this advance . English promoters have made the further mistake of exacting an inordinate commission for their services , necessitating the holders of mines to ...
الصفحة 27
... course of the pliocene rivers , and the course and flow of the lava streams which in the higher Sierra have filled the an- cient rivers . Two more volumes on economical geology and mining are now prepared and ready for press , and their ...
... course of the pliocene rivers , and the course and flow of the lava streams which in the higher Sierra have filled the an- cient rivers . Two more volumes on economical geology and mining are now prepared and ready for press , and their ...
الصفحة 47
... course of northwest and southeast , and are evidently true fissures . At many localities , among which we may instance Bald Mountain , east of Columbia , in Tuolumne County , smaller veins occur , with an east and west course ...
... course of northwest and southeast , and are evidently true fissures . At many localities , among which we may instance Bald Mountain , east of Columbia , in Tuolumne County , smaller veins occur , with an east and west course ...
الصفحة 51
... course of N. 40 ° E. , with very solid and smooth walls , and from 5 to 12 feet wide . In these occur the quartz veins , the quartz occupying only a portion of the space , ( 3 to 9 feet , ) the balance being filled by an accompanying ...
... course of N. 40 ° E. , with very solid and smooth walls , and from 5 to 12 feet wide . In these occur the quartz veins , the quartz occupying only a portion of the space , ( 3 to 9 feet , ) the balance being filled by an accompanying ...
الصفحة 56
... course , nearly parallel with the present main crest of the Sierra , before the mountains were uplifted . But the detailed and extensive explorations of the gravel mines which have been made during the past two years by the State ...
... course , nearly parallel with the present main crest of the Sierra , before the mountains were uplifted . But the detailed and extensive explorations of the gravel mines which have been made during the past two years by the State ...
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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