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 22
... located . 2 In 1516 , however , Diego Miruelo obtained a little gold from the natives , ' and in 1519 Pineda , who coasted along the western coast of the peninsula and along the Texan coast , reported that many of the rivers contained ...
... located . 2 In 1516 , however , Diego Miruelo obtained a little gold from the natives , ' and in 1519 Pineda , who coasted along the western coast of the peninsula and along the Texan coast , reported that many of the rivers contained ...
Stran 32
... located in the Sierra San Fernando , forty - five miles northwest from the Pueblo Los Angeles , were dis- covered . These were the most productive deposits so far found and were worked in a small way for twenty years or more . " Placers ...
... located in the Sierra San Fernando , forty - five miles northwest from the Pueblo Los Angeles , were dis- covered . These were the most productive deposits so far found and were worked in a small way for twenty years or more . " Placers ...
Stran 36
... located in 1860 , but was not worked until 1867 ; following which came the discovery of the Cassiar in 1874 and later that of Sitka . By this time the fact that gold existed in Alaska in paying quantities was established beyond question ...
... located in 1860 , but was not worked until 1867 ; following which came the discovery of the Cassiar in 1874 and later that of Sitka . By this time the fact that gold existed in Alaska in paying quantities was established beyond question ...
Stran 37
... located prior to 1875 , one of the most prominent being the Duncan mine in May , 1867 , formerly the Thuniah ( or Shumiah ) , not far from Prince Arthur's Landing on Thunder Bay . After expending fully a half million dollars , for a ...
... located prior to 1875 , one of the most prominent being the Duncan mine in May , 1867 , formerly the Thuniah ( or Shumiah ) , not far from Prince Arthur's Landing on Thunder Bay . After expending fully a half million dollars , for a ...
Stran 39
... located as late as 1845-46 . It is probable that still further exploratory work was done on Isle Royal and Michipocoten . Silver was not , however , found in pay- ing quantities and the project was abandoned in 1770. Neverthe- less , in ...
... located as late as 1845-46 . It is probable that still further exploratory work was done on Isle Royal and Michipocoten . Silver was not , however , found in pay- ing quantities and the project was abandoned in 1770. Neverthe- less , in ...
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Alaska amalgamation andesite argentiferous assay auriferous average bed-rock blende bornite calcite California Carolina cent chalcopyrite chloride chlorination Colorado Comstock lode concentration 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 gneiss gold and silver gold production Gold-bearing granite gravel gray copper Gulch Hill hydraulic Ibid Idaho inches iron Jour lead limestone located mercury method Mexico mill Mineral Industry Mineral Resources Mines and Minerals Montana Mountain Nevada North occur operations ore-bodies ounces output oxide placer mines placers porphyry precious metals Press probably production of gold pyrite pyrrhotite quantities quartz quartz-veins quartzites Rept rhyolite River rocks schists shaft siliceous silver production Silver-bearing slate sluices smelting solution South stamps stope sulphides sulphurets surface TABLE tellurides tellurium tetrahedrite timber tion tons Total tunnel Utah yield zinc