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These prehistoric mines' ages were a "long-standing mystery," says David Pompeani, a geologist at the University of Hawaii at Mānoa. Previous research used archaeological remnants to evaluate when mine sites were active, but later mining at the same sites often obliterated ancient artifacts, Pompeani says. To work around this, he and his colleagues took a different approach: instead of artifacts, they looked for signs of mining preserved in the environment.For a recent study in Anthropocene, the researchers examined sediments from two small inland lakes near ancient mines on Lake Superior's isolated Isle Royale in Michigan. Such sediments are affected by...

The discovery of one of the world's oldest shipwrecks shows that European trade was thriving even in the Bronze Age, according to experts. The vessel, carrying copper and tin ingots used to make weapons and jewellery, sank off the coast near Salcombe in Devon and is thought to date from 900BC. But it was only last year that the South West Maritime Archaeological Group, a team of amateur archaeologists, brought its cargo to the surface. The discovery was not announced until this month's International Shipwreck Conference, in Plymouth, Devon. It is thought that the goods - 259 copper ingots and...

The Shipping of Michigan Copper across the Atlantic in the Bronze Age (Isle Royale and Keweenaw Peninsula, c. 2400BC-1200 BC) Summary Recent scientific literature has come to the conclusion that the major source of the copper that swept through the European Bronze Age after 2500 BC is unknown. However, these studies claim that the 10 tons of copper oxhide ingots recovered from the late Bronze Age (1300 BC) Uluburun shipwreck off the coast of Turkey was “extraordinarily pure” (more than 99.5% pure), and that it was not the product of smelting from ore. The oxhides are all brittle “blister copper”,...