| 31. | :Bronze, is a harder metal, and it is not found like native copper, but has to be forged as an alloy.
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| 32. | Calumet and Hecla opened the Kingston mine in 1965, the first new native copper mine opened in more than 30 years.
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| 33. | Native copper is known to have been extracted from sites on Isle Royale with primitive stone tools between 800 and 1600.
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| 34. | Only the Copper Range company's White Pine mine remained open, and its ore was mostly copper sulfides, rather than native copper.
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| 35. | Unusual materials include native copper ( Michigan ), | group = n } } to about ( Philadelphia and New York City ).
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| 36. | Typically, if native copper is a minor part of a supergene profile it will not be recovered and will report to the tailings.
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| 37. | Apaches, Spaniards, Mexicans, and Americans have all obtained native copper and copper ore from this site, once known as the Santa Rita mine,.
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| 38. | But the ore grades were too low, the ore mineral particles too small, and the copper was largely in sulfides instead of native copper.
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| 39. | "' Native copper "'is an elements to occur in native form, although it most commonly occurs in oxidized states and mixed with other elements.
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| 40. | It is found in several parts of the North Island, and occupies similar habitats to the native copper skink ( " Cyclodina aenea " ).
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