Copper Artifacts from Prehistoric Archeological Sites in the Dakotas

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Science  02 Dec 1966:
Vol. 154, Issue 3753, pp. 1171-1173
DOI: 10.1126/science.154.3753.1171


Thirteen archeological specimens were analyzed spectrographlically, and within defined limits they were determined to be native copper. Twelve of the specimens show close elemental homogeneity and are believed to be of Lake Superior ore; the origin of the other specimen is deviolus.