Gold and Silver: Comprising an Economic History of Mining in the United States, the Geographical and Geological Occurrence of the Precious Metals, with Their Mineralogical Associations, History and Description of Methods of Mining and Extraction of Values, and a Detailed Discussion of the Production of Gold and Silver in the World and the United StatesJ. Wiley & Sons, 1908 - 727 strani |
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Zadetki 1–5 od 49
Stran vii
... Concentration . Metallurgy . Pyritic Smelting . - Processes and Practice . - Chlorin- ation . Processes and Practice . - Cyanidation . Processes and Practice , Filterpress Work and Precipitation . - 527 CHAPTER VII . PRODUCTION OF GOLD ...
... Concentration . Metallurgy . Pyritic Smelting . - Processes and Practice . - Chlorin- ation . Processes and Practice . - Cyanidation . Processes and Practice , Filterpress Work and Precipitation . - 527 CHAPTER VII . PRODUCTION OF GOLD ...
Stran 121
... Concentration of sulphurets was effected at the Vaucluse mine , Virginia , by means of tables and strakes . Raw amalgamation was also practiced here , and was probably the first application of the process in this country . Pyritic ...
... Concentration of sulphurets was effected at the Vaucluse mine , Virginia , by means of tables and strakes . Raw amalgamation was also practiced here , and was probably the first application of the process in this country . Pyritic ...
Stran 145
... concentration apparatus manufacture . Gold was found in sandstone at Bellville , Ohio . The gold production of Oregon again fell off . Hydraulicing was carried on in the Argonaut mine , Utah , at the mouth of Carr Fork . The Camp Floyd ...
... concentration apparatus manufacture . Gold was found in sandstone at Bellville , Ohio . The gold production of Oregon again fell off . Hydraulicing was carried on in the Argonaut mine , Utah , at the mouth of Carr Fork . The Camp Floyd ...
Stran 175
... concentration of native gold and auriferous pyrites in sufficient quantities to make its extraction profitable . The larger part of the country - rock is a carbonaceous slate of quite uniform texture , the origin of which was ...
... concentration of native gold and auriferous pyrites in sufficient quantities to make its extraction profitable . The larger part of the country - rock is a carbonaceous slate of quite uniform texture , the origin of which was ...
Stran 201
... concentration of metallic minerals into ore- deposits . It is in the older crystalline and eruptive rocks that gold - bearing ores are mainly found . " Although considerable gold has been derived from placers , by far the greater part ...
... concentration of metallic minerals into ore- deposits . It is in the older crystalline and eruptive rocks that gold - bearing ores are mainly found . " Although considerable gold has been derived from placers , by far the greater part ...
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Alaska amalgamation andesite argentiferous assay auriferous average bed-rock blende calcite California Carolina cent chalcopyrite chlorination Colorado Comstock lode considerable copper country-rock County Cripple Creek cyanide cyanide process Deep Mines deposits depth diorite discovered discovery district dollars drift employed extraction feet free-gold furnace galena gangue gold and silver gold production gold-bearing granite gravel gray copper Gulch Hill hydraulic Ibid Idaho igneous rocks inches iron Jour lead limestone located mercury method Mexico mill Mineral Industry Mineral Resources Mines and Minerals Montana Mountain Nevada North North Carolina occur operations ore-bodies ounces output oxide placer mines placers porphyry precious metals Press probably production of gold pyrite quantities quartz quartz-veins Rept River roasting rocks schists shaft silver production Silver-bearing slate sluices smelting solution South stamps stope sulphides sulphurets surface TABLE tellurides tellurium tetrahedrite timber tion tons Total tunnel usually Utah veins width yield zinc