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 14
... ground ( in acres ) now being worked , and the extent of the aurif- erous deposits ; an estimate of the yield of hydraulic ground , per cubic yard ; and a statement of the yield and expense of milling per cubic yard ( where stamps are ...
... ground ( in acres ) now being worked , and the extent of the aurif- erous deposits ; an estimate of the yield of hydraulic ground , per cubic yard ; and a statement of the yield and expense of milling per cubic yard ( where stamps are ...
Stran 22
... ground should be secured ; to which end the titles to individual claims are first extin guished when they are aggregated in large masses , for which a United States patent is , in most cases , afterward procured . Some of these min- ing ...
... ground should be secured ; to which end the titles to individual claims are first extin guished when they are aggregated in large masses , for which a United States patent is , in most cases , afterward procured . Some of these min- ing ...
Stran 36
... ground ; that it can be rapidly and cheaply constructed in the worst possible country ; and that when there is sufficient grade , not only does it run itself by gravitation , but produces a motive power at both ends of the line ...
... ground ; that it can be rapidly and cheaply constructed in the worst possible country ; and that when there is sufficient grade , not only does it run itself by gravitation , but produces a motive power at both ends of the line ...
Stran 42
... ground , Nevada County ; the American Company's ground , North San Juan ; Nevada County , Oregon City , Butte County ; the Taeff and Franklin ground , Dutch Flat , Placer County , and in many other localities in perpendicular boring for ...
... ground , Nevada County ; the American Company's ground , North San Juan ; Nevada County , Oregon City , Butte County ; the Taeff and Franklin ground , Dutch Flat , Placer County , and in many other localities in perpendicular boring for ...
Stran 47
... ground at points where water has been lately brought in , or in the development of the ancient channels . Superficial placer , as well as river and bar - mining may be considered as practically exhausted , although operations are still ...
... ground at points where water has been lately brought in , or in the development of the ancient channels . Superficial placer , as well as river and bar - mining may be considered as practically exhausted , although operations are still ...
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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