The world’s top 10 highest-grade copper mines
Avanco Resources’ Antas open-pit copper-gold mine is located in the Carajás mineral-rich province in northern Brazil. The Carajás region is regarded as one of the most prospective mineral provinces in the world for the discovery of high-grade large-tonnage copper-gold and iron ore resources. Antas is a high-grade, low-cost copper mine with gold byproduct credits and significant exploration potential. 2.5% copper grade in reserves puts this mine fifth on the list.
http://www.mining.com/the-worlds-top-10-highest-grade-copper-mines/
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