According to research house Wood Mackenzie, the need for investment is becoming desperate in zinc and lead and will be a major issue in the copper sector in the next few years.
Helicopters, drones search 16,000 square km area sealed off to find perpetrators of knife attack that killed 60 workers at a northwestern Chinese coal mine.
Six people have been killed in anti-mining protests so far this year, including three at last week's clash between police and locals near Las Bambas copper mine.