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 100
Stran 62
... inches long , thickness not given ) which he was induced to sell for the sum of $ 3.50 . The following year he , with several others , discovered another piece of gold and quartz weigh- ing 28 pounds , and from that time on other pieces ...
... inches long , thickness not given ) which he was induced to sell for the sum of $ 3.50 . The following year he , with several others , discovered another piece of gold and quartz weigh- ing 28 pounds , and from that time on other pieces ...
Stran 100
... inches ) deep , some pieces of quartz have been found containing from 8 to 10 grams ( 123 to 154 grains ) of pure gold . In the jurisdiction of Corozal some wash- ing machinery was established , and the result was from $ 2.17 to $ 4.30 ...
... inches ) deep , some pieces of quartz have been found containing from 8 to 10 grams ( 123 to 154 grains ) of pure gold . In the jurisdiction of Corozal some wash- ing machinery was established , and the result was from $ 2.17 to $ 4.30 ...
Stran 101
... inches ) in diam- eter and 12 centimeters ( 5 inches deep ) . In the watersheds of Mameyes River and in all the rivers crossing the jurisdiction of Corozal , numbers of peasants can be seen engaged in the work of washing auriferous sand ...
... inches ) in diam- eter and 12 centimeters ( 5 inches deep ) . In the watersheds of Mameyes River and in all the rivers crossing the jurisdiction of Corozal , numbers of peasants can be seen engaged in the work of washing auriferous sand ...
Stran 173
... inches . The quartz is highly vitreous and of bluish color . It is said that about one - half of the gold is free - milling , the remainder being in sulphurets . ' T. A. I. M. E. , Vol . 26 , p . 466 . Fed . Inst . Min . Engrs . , Vol ...
... inches . The quartz is highly vitreous and of bluish color . It is said that about one - half of the gold is free - milling , the remainder being in sulphurets . ' T. A. I. M. E. , Vol . 26 , p . 466 . Fed . Inst . Min . Engrs . , Vol ...
Stran 185
... inches to several feet in width . Widths of from 10 to 15 feet are found in the veins of Mariposa and Tuolumne counties , but they are rather limited in horizontal extent and probably do not extend deeper than 10,000 feet . The common ...
... inches to several feet in width . Widths of from 10 to 15 feet are found in the veins of Mariposa and Tuolumne counties , but they are rather limited in horizontal extent and probably do not extend deeper than 10,000 feet . The common ...
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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