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 16
... erecting reduction - works , while in most of our large mines extensive deposits are held in reserve , and exploratory la- bors maintained well in advance of extraction . In strong contrast with the unfortunate results of the large ...
... erecting reduction - works , while in most of our large mines extensive deposits are held in reserve , and exploratory la- bors maintained well in advance of extraction . In strong contrast with the unfortunate results of the large ...
الصفحة 20
... erection of many large mills and reduction works , to say nothing of the favorable developments being everywhere made in our mines , we have ample assurance of the largely augmented production that awaits us in the future . There is ...
... erection of many large mills and reduction works , to say nothing of the favorable developments being everywhere made in our mines , we have ample assurance of the largely augmented production that awaits us in the future . There is ...
الصفحة 22
... erection of quartz - mills and reduc- tion - works , in the projection of ditches and reservoirs , in rigging up hydraulic apparatus , and in exploring the ancient river - channels , every- thing is conducted on a scale that causes most ...
... erection of quartz - mills and reduc- tion - works , in the projection of ditches and reservoirs , in rigging up hydraulic apparatus , and in exploring the ancient river - channels , every- thing is conducted on a scale that causes most ...
الصفحة 23
... erected on it , and uprear its lofty , smoking top from out the waters far above all surrounding objects . The works ... erection , and nearly all other preliminary labor completed . The pro- jector of this enterprise has himself ...
... erected on it , and uprear its lofty , smoking top from out the waters far above all surrounding objects . The works ... erection , and nearly all other preliminary labor completed . The pro- jector of this enterprise has himself ...
الصفحة 36
... erected for reduc- tion of its ores , and over $ 100,000 expended and lost . The ore could not be made to pay . The operation was pronounced a failure , and the mill removed . Tests of ten and twenty tons were also worked at the Essex ...
... erected for reduc- tion of its ores , and over $ 100,000 expended and lost . The ore could not be made to pay . The operation was pronounced a failure , and the mill removed . Tests of ten and twenty tons were also worked at the Essex ...
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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