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 74
Stran 14
... bed - rock tunnels , & c . , ) either in progress or in contemplation . A general statement of the condition and ... ROCKY MOUNTAINS .
... bed - rock tunnels , & c . , ) either in progress or in contemplation . A general statement of the condition and ... ROCKY MOUNTAINS .
Stran 23
... bed - rock of the bay is reached , when a huge chimney will be erected on it , and uprear its lofty , smoking top from out the waters far above all surrounding objects . The works are already the most extensive in the United States ...
... bed - rock of the bay is reached , when a huge chimney will be erected on it , and uprear its lofty , smoking top from out the waters far above all surrounding objects . The works are already the most extensive in the United States ...
Stran 26
... 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 sometimes more than one rich , gold - bearing layer of gravel ...
... 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 sometimes more than one rich , gold - bearing layer of gravel ...
Stran 41
... bed - rock tunnels can be run in from one - half to one - sixth of the time required by hand - drill- ing , so that one of the greatest objections to this kind of mining ( the great length of time required to drive a long tunnel ) is ...
... bed - rock tunnels can be run in from one - half to one - sixth of the time required by hand - drill- ing , so that one of the greatest objections to this kind of mining ( the great length of time required to drive a long tunnel ) is ...
Stran 51
... stone , etc. , occupying fissures which run transversely across the slate ... rock , and not found outside of the fissure walls . The whole of this vein ... bed several hundred feet higher than the modern river - the Stanislaus - by ...
... stone , etc. , occupying fissures which run transversely across the slate ... rock , and not found outside of the fissure walls . The whole of this vein ... bed several hundred feet higher than the modern river - the Stanislaus - by ...
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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