Refining the chronology of North America’s copper using traditions: A macroscalar approach via Bayesian modeling
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DOI: 10.1371/journal.pone.0266908
Abstract: North America’s ancient copper use, predicted to originate as early as 9000 cal BP, represents the earliest use of native copper for utilitarian tool production in the world. Although recent work has focused on establishing… read more here.
Keywords: copper; copper using; north america; copper use ... See more keywords
Extraction of Mn from Black Copper Using Iron Oxides from Tailings and Fe2+ as Reducing Agents in Acid Medium
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DOI: 10.3390/met9101112
Abstract: Exotic type deposits include several species of minerals, such as atacamite, chrysocolla, copper pitch, and copper wad. Among these, copper pitch and copper wad have considerable concentrations of manganese. However, their non-crystalline and amorphous structure… read more here.
Keywords: black copper; copper using; medium; extraction black ... See more keywords