Statistics of Mines and Mining in the States and Territories West of the Rocky Mountains: Being the ... Annual Report, 4. izdajaU.S. Government Printing Office, 1873 |
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Zadetki 1–5 od 100
Stran 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 ...
Stran 26
... course of the explorations recently carried on in our old river- beds and other of our deep - lying placers , it has , in many places , been found that , beneath what was generally mistaken for the bed - rock , there is another , and ...
... course of the explorations recently carried on in our old river- beds and other of our deep - lying placers , it has , in many places , been found that , beneath what was generally mistaken for the bed - rock , there is another , and ...
Stran 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 ...
Stran 38
... course these figures vary according to locality , wood , and labor : 14 - ton mill . 3 - ton mill 6 - ton mill : 12 - ton mill 24 - ton mill . Weight . 24 tons . Power . Cost per ton of working . 5 - horse . $ 7 50 to $ 10 00 .4 tons ...
... course these figures vary according to locality , wood , and labor : 14 - ton mill . 3 - ton mill 6 - ton mill : 12 - ton mill 24 - ton mill . Weight . 24 tons . Power . Cost per ton of working . 5 - horse . $ 7 50 to $ 10 00 .4 tons ...
Stran 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 ...
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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 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 Montana 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