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Books Books 1 - 3 of 3 on Residual accumulations of metallic oxides is the rule, often forming thick crusts....  
" Residual accumulations of metallic oxides is the rule, often forming thick crusts of masses of "gossan," or else only staining the rocks upon which it is deposited. The chief metallic element of the gossan is of course iron, though it very often contains... "
Mines and mineral resources of Shasta county, Siskiyou county, Trinity county - Page 15
by G. Chester Brown, California State Mining Bureau - 1915 - 192 pages
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Bulletin, Issue 23

California State Mining Bureau - Geology - 1902
...metallic oxides is the rule, often forming thick crusts of masses of "gossan," or else only staining the rocks upon which it is deposited. The chief metallic element of the gossan is of course iron, though it very often contains a small percentage of copper, and it has often formed...
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The copper resources of California: issued by the California state mining ...

Lewis E. Aubury - Copper mines and mining - 1908 - 366 pages
...metallic oxides is the rule, often forming thick crusts of masses of "gossan," or else only staining the rocks upon which it is deposited. The chief metallic element of the gossan is of course iron, though it very often contains a small percentage of copper, and it has often formed...
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Bulletin, Issues 21-23; Issue 50

Mines and mineral resources - 1908
...metallic oxides is the rule, often forming thick crusts of masses of "gossan," or else only staining the rocks upon which it is deposited. The chief metallic element of the gossan is of course iron, though it very often contains a small percentage of copper, and it has often formed...
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