The New Encyclopędia BritannicaEncyclopędia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 148
... Copper Age in the Americas probably dawned between AD 100 and 200. Native copper was mined and used extensively and , though some bronze appeared in South America , its use developed slowly until after the arrival of Columbus and other ...
... Copper Age in the Americas probably dawned between AD 100 and 200. Native copper was mined and used extensively and , though some bronze appeared in South America , its use developed slowly until after the arrival of Columbus and other ...
Page 149
Table 1 : General Classification of the Ore Minerals of Copper formula copper ( percent ) * Cu 99.9 Native copper ore Native copper Sulfide ores Chalcocite Covellite Chalcopyrite Bornite Enargite Tetrahedrite Oxide ores Cuprite Tenorite ...
Table 1 : General Classification of the Ore Minerals of Copper formula copper ( percent ) * Cu 99.9 Native copper ore Native copper Sulfide ores Chalcocite Covellite Chalcopyrite Bornite Enargite Tetrahedrite Oxide ores Cuprite Tenorite ...
Page 150
... copper in the form of a solution of copper sulfate . The copper is recovered from the solution by precipitation on scrap iron . Refining . Refining involves the removal of impurities from copper metal to yield a product containing less ...
... copper in the form of a solution of copper sulfate . The copper is recovered from the solution by precipitation on scrap iron . Refining . Refining involves the removal of impurities from copper metal to yield a product containing less ...
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activity American animals appear areas authority become body called cause cells central century charge common complex conservation consists constant constitution consumer contain continental continued copper cosmic rays countries court crime criminal Crusade direct early effect electron elements energy England established Europe evidence example exist fact field force ground groups House important increase individual industrial involved Italy known land later less letters limited living major material means measure ment metal natural occur organic original particles particular party percent period person play political population position present problems protection reefs region remains result rule social South species structure theory tion United usually various