Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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Halaman 7
... reduction of ores . One evi- dence of this fact is found in the numerous inquiries upon practical points addressed to me by letter , or in personal visits from persons en- gaged in mining , milling , and smelting throughout the West ...
... reduction of ores . One evi- dence of this fact is found in the numerous inquiries upon practical points addressed to me by letter , or in personal visits from persons en- gaged in mining , milling , and smelting throughout the West ...
Halaman 16
... reduction - works without some- thing having been first ascertained as to the capacity of the mine whence ores are expected to be obtained for supplying them . Indeed , a good degree of development is insisted upon as a condition ...
... reduction - works without some- thing having been first ascertained as to the capacity of the mine whence ores are expected to be obtained for supplying them . Indeed , a good degree of development is insisted upon as a condition ...
Halaman 18
... reduce ores expeditiously and cheaply , but not to as expeditiously wash everything away , having an eye more to pounding up the rock than to taking up the metal . That our gold ores are so readily amalgamated , is one of the ruinous ...
... reduce ores expeditiously and cheaply , but not to as expeditiously wash everything away , having an eye more to pounding up the rock than to taking up the metal . That our gold ores are so readily amalgamated , is one of the ruinous ...
Halaman 19
... reduction ? Therein lies the secret of high assays before working , and small returns after . Gold in its matrix , according to the highest authorities , is in a metallic condition . Such being the case , the first requisite is minute ...
... reduction ? Therein lies the secret of high assays before working , and small returns after . Gold in its matrix , according to the highest authorities , is in a metallic condition . Such being the case , the first requisite is minute ...
Halaman 22
... reduction by smelting , larger furnaces will be substituted for the rude and limited works used for pioneer purposes , these having in some instances already been replaced by others of more perfect patterns and increased capacity . We ...
... reduction by smelting , larger furnaces will be substituted for the rude and limited works used for pioneer purposes , these having in some instances already been replaced by others of more perfect patterns and increased capacity . We ...
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Istilah dan frasa umum
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 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