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 21
... projects undertaken constitute a notable fea- ture in the late history of mining enterprise on this side the continent . Nearly all operations and improvements are now planned and carried CONDITION OF MINING INDUSTRY - CALIFORNIA . 21.
... projects undertaken constitute a notable fea- ture in the late history of mining enterprise on this side the continent . Nearly all operations and improvements are now planned and carried CONDITION OF MINING INDUSTRY - CALIFORNIA . 21.
Halaman 36
... side of the posts and up the other , 400 to the mile , each delivering fifty pounds of ore , or ten tons per hour , and they can be run twenty - four hours per day . * Paul's process . - The " electric dry amalgamating process ...
... side of the posts and up the other , 400 to the mile , each delivering fifty pounds of ore , or ten tons per hour , and they can be run twenty - four hours per day . * Paul's process . - The " electric dry amalgamating process ...
Halaman 51
... side of Table Mountain , at places where bars evidently existed in the ancient river , and the lava flow sought the deep channel , forming an elbow or curve on which the lava crust was very thin , or sometimes entirely denuded . Table ...
... side of Table Mountain , at places where bars evidently existed in the ancient river , and the lava flow sought the deep channel , forming an elbow or curve on which the lava crust was very thin , or sometimes entirely denuded . Table ...
Halaman 53
... side of the river large enough to contain a box flume which will be covered with rock and dirt , leaving the bank of the river in its natural state . But little fluming will be used . Around rocky points a stone wall is commenced far ...
... side of the river large enough to contain a box flume which will be covered with rock and dirt , leaving the bank of the river in its natural state . But little fluming will be used . Around rocky points a stone wall is commenced far ...
Halaman 54
... side of Table Mountain , where the formation is very precipitous , instead of on the eastern side , where it slopes gently to Wood's Creek . This tunnel will enter the west side of Table Mountain about three hundred feet below its ...
... side of Table Mountain , where the formation is very precipitous , instead of on the eastern side , where it slopes gently to Wood's Creek . This tunnel will enter the west side of Table Mountain about three hundred feet below its ...
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50 feet amalgam amount antimony arrastra assay average Bannack base bullion bed-rock bullion Calaveras County California CaƱon 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