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Books Bücher 1 - 5 von 5 in The average percentage of copper in the ores from these mines varies from three quarters...
" The average percentage of copper in the ores from these mines varies from three quarters of 1 per cent to 2 per cent. Third, the Conglomerate mines, which are characterized by the occurrence of the free copper mostly in strings in a hard conglomerate... "
Bulletin - United States National Museum - Seite 82
von United States National Museum - 1892
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PROCEEDINGS

U.S. Department of Interior - 1885
...strings in a hard conglomerate of ferruginous quartz pebbles, are represented by the Conglomerate mine. The average percentage of copper in the ores from these mines varies from 4 per cent, to 6 per cent. Taking the Conglomerate mine, the collection shows, first, the general character...
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Report of the United States National Museum ...

United States National Museum - 1884
...few hundred pounds in weight (with rarely a large mass) disseminated in a soft amygdaloid trap-rock. The average percentage of copper in the ores from these mines varies from threequarters of 1 per cent, to 2 per cent. Third, the conglomerate mines, which a re characterized...
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Annual Report of the State Mineralogist for the Year Ending ..., Band 5

California State Mining Bureau - 1885
...rarely a large mass) disseminated in a soft amygdaloid trap-rock, are represented by the Osceola Mine. The average percentage of copper in the ores from these mines varies from three quarters of 1 per cent to 2 per cent. Third, the Conglomerate mines, which are characterized...
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The Published Writings of George Newbold Lawrence, 1844-1891

Lyman Spalding Foster - 1892 - 124 Seiten
...few hundred pounds in weight (with rarely a large mass) disseminated in a soft amygdaloid trap rock. The average percentage of copper in the ores from these mines varies from three-quarters of 1 to 2 per cent. Third. The conglomerate mines, which are characterized by the occurrence...
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Annual Report of the Board of Regents of the Smithsonian Institution: 1884

Smithsonian Institution. Board of Regents - 1885
...rarely a large mass), disseminated in a soft amygdaloid trap-rock, are represented by the Osceola mine. The average percentage of copper in the ores from these mines varies from three quarters of 1 per cent, to 2 per cent. Third, the conglomerate mines, which are characterized...
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