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 79
Stran 81
... blende , yet it contains some silver , in such quantities , in fact , as to permit of separation . Silver Creek in St. Clair County , took its name from the explorers under Renault , and tradition says that a considerable quantity of ...
... blende , yet it contains some silver , in such quantities , in fact , as to permit of separation . Silver Creek in St. Clair County , took its name from the explorers under Renault , and tradition says that a considerable quantity of ...
Stran 135
... blende ores were treated by the lixiviation process at Galena , Nevada , having been previously concentrated by the Krom dry system . 1878 . Lixiviation was employed at the Advance mill , Monitor , Cali- fornia . A gold nugget was found ...
... blende ores were treated by the lixiviation process at Galena , Nevada , having been previously concentrated by the Krom dry system . 1878 . Lixiviation was employed at the Advance mill , Monitor , Cali- fornia . A gold nugget was found ...
Stran 156
... blende , arsenopyrite , chalcopyrite , and bournonite are all soluble in sodic sulphide by treating the finely powdered minerals for twenty - four days of twelve hours at a temperature of 80 ° C. in glass tubes . Quantity of mineral ...
... blende , arsenopyrite , chalcopyrite , and bournonite are all soluble in sodic sulphide by treating the finely powdered minerals for twenty - four days of twelve hours at a temperature of 80 ° C. in glass tubes . Quantity of mineral ...
Stran 160
... blende , wolfram , and metallic gold , constitute especially favorable nuclei to demonstrate this chemical reaction . ” 1 The association would appear to be more of adhesion than of an alloy , in either case maintaining that relation ...
... blende , wolfram , and metallic gold , constitute especially favorable nuclei to demonstrate this chemical reaction . ” 1 The association would appear to be more of adhesion than of an alloy , in either case maintaining that relation ...
Stran 167
... blende and copper pyrites ; iron and arsenical pyrites , etc. , are illustrations ; all of which are common associates of gold . Iron and copper pyrites are often gold - bearing , while galena and blende are almost universally silver ...
... blende and copper pyrites ; iron and arsenical pyrites , etc. , are illustrations ; all of which are common associates of gold . Iron and copper pyrites are often gold - bearing , while galena and blende are almost universally silver ...
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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