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The bones of a child approximately 8 to 12 years old, also dating to about 3,000 years ago, were buried with a stone bead and with what appeared to be a copper pendant, perforated by a small hole near the top.
The mask measures about 7 inches (18 centimeters) long and nearly 6 inches (15 cm) wide. To create the mask, someone would have hammered the metal flat while it was cold and then reheated it, according to the researchers.
"This data is essential to any narrative that seeks to understand the emergence of Andean metallurgy," they added.
The findings, which were published online June 5 in the journal Antiquity, were originally published in 2010 in the journal Boletín del Museo Chileno de Arte Precolombino.
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Sources of copper ore have been found within 44 miles (70 kilometers) of the location where the mask was uncovered, suggesting that it was produced locally.
It is therefore highly probably that metalworking emerged in Argentina at the same time that it was developing in Peru, the researchers wrote in the study. 1000 were previously found in the Peruvian Andes, though it is difficult for experts to say for sure if the objects originated where they were found, or if trade brought them there, Live Science reported in 2007.
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I chat with plus size supermodel Liris Crosse, who I now have a girl crush on because she is straight talking and awesome.An ancient, rectangular copper mask recently found in the southern Andes in Argentina is about 3,000 years old — one of the oldest human-made metal object from South America — and its discovery challenges the accepted idea that South American metalworking originated in Peru, according to archaeologists.