Nature, Volume 84Sir Norman Lockyer Macmillan Journals Limited, 1910 |
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Página 199
... reference of so many metalliferous sandstones and conglomerates to the epigenetic group . He includes there , for example , the Katanga quartzite , which contains small nuggets of gold and platinum . In fact , the only pre - Cainozoic ...
... reference of so many metalliferous sandstones and conglomerates to the epigenetic group . He includes there , for example , the Katanga quartzite , which contains small nuggets of gold and platinum . In fact , the only pre - Cainozoic ...
Página 293
... reference to foreign mining fields . The classification of ores adopted by the authorities is based solely on genetic grounds . They describe first the ores due to the segregation of metals in igneous rocks , a process to which the ...
... reference to foreign mining fields . The classification of ores adopted by the authorities is based solely on genetic grounds . They describe first the ores due to the segregation of metals in igneous rocks , a process to which the ...
Página 457
... reference by which the discovery is fixed , and extending down to the year 1900. Part ii . ( 17 pages ) , a list of selected works , monographs , treatises , and text - books , with their authors , also to the year 1900. Part iii . ( 5 ...
... reference by which the discovery is fixed , and extending down to the year 1900. Part ii . ( 17 pages ) , a list of selected works , monographs , treatises , and text - books , with their authors , also to the year 1900. Part iii . ( 5 ...
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