Lead isotopes trace Malawi's mysterious copper ingot hoard to Congo's Kipushi mine
In 1967, a Malawian farmer stumbled upon a hidden hoard of eight copper ingots buried beneath a tree. Now, more than half a century later, scientists have traced the metal to its source: a copper mine nearly 800 km (500 miles) away.
This is a short extract from a report by Phys.org. The full text stays with the publisher — follow the link to read it there.
Read at source