| 1. | High-grade native copper made Ajo the first copper mine in Arizona.
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| 2. | The miners sometimes found masses of native copper up to hundreds of tons.
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| 3. | Michigan's native copper industry was essentially dead, after producing of copper.
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| 4. | The native copper deposits originate in fissures, steeply dipping conglomerate beds.
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| 5. | As native copper was available, ancient civilizations started to use it.
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| 6. | Associated minerals include chalcocite, atacamite, native copper, diopside, grossular and vesuvianite.
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| 7. | Masses of native copper weighing hundreds of tons were sometimes found in the mines.
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| 8. | The Cliff mined a fissure vein of native copper in Precambrian conglomerate and basalt beds.
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| 9. | The principal ore minerals were chalcocite and native copper.
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| 10. | Prior to the 19th century, Native American groups mined native copper on the Keweenaw Peninsula.
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