11 mayo 2015
Climate helps drive the erosion process that exposes economically valuable copper deposits and shapes the pattern of their global distribution, according to a new study. Nearly three-quarters of the world’s copper production comes from large deposits that form about 2 kilometers (1.2 miles) beneath the Earth’s surface, known as porphyry copper deposits. Over the course of millions to tens of millions of years, they are exposed by erosion and can then be mined.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/OaPWvOcdLAA/150511112129.htm
