THE largest gold deposit in the world, worth over £63 billion, has been discovered in China. Geologists believe more than 1,000 tonnes of the precious metal could be uncovered under a supergiant ...
Secondary: broken jewellery from that is 37% pure. The gold is washed in chemicals to reach a concentration of 99.99%. The lower the concentration, the more washes the metal needs. Throughout the ...
More than 40 veins, which are long and thin openings in rocks filled with gold, were found under the fields in Pingjiang County. Drilling revealed more than 300 tonnes of the precious metal was ...