Nature, Volume 104Sir Norman Lockyer Macmillan Journals Limited, 1919 |
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Página 171
... known , but none apparently of great importance . There are several known deposits of blende and galena , but only one , a mine at Sadon , is being worked at present ; it is in the hands of a Russo - Belgian company , the Société ...
... known , but none apparently of great importance . There are several known deposits of blende and galena , but only one , a mine at Sadon , is being worked at present ; it is in the hands of a Russo - Belgian company , the Société ...
Página 245
... known instance of the application of leaching on a large scale . Recently the extraction and refining of copper by hydrometallurgical and electrolytic methods direct from the ore has become a commercial process . Many of the low - grade ...
... known instance of the application of leaching on a large scale . Recently the extraction and refining of copper by hydrometallurgical and electrolytic methods direct from the ore has become a commercial process . Many of the low - grade ...
Página 273
... known to the Persian writers as Turan and Iran . This Western section is generally known as the Western Turks , and was perhaps the only portion of the stock specifically called Turks at that time . Another great section occupied the ...
... known to the Persian writers as Turan and Iran . This Western section is generally known as the Western Turks , and was perhaps the only portion of the stock specifically called Turks at that time . Another great section occupied the ...
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