A consortium of state-owned Chinese companies led by China Minmetals Corporation, one of the country’s biggest metals miners, announced on Monday an agreement to buy a giant copper mine in Peru from Glencore Xstrata for more than $6 billion. A consortium of state-owned Chinese companies led by China Minmetals Corporation, one of the country’s biggest metals miners, announced on Monday an agreement to buy a giant copper mine in Peru from Glencore Xstrata for more than $6 billion.