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Pinto Valley life increases

Capstone Mining’s prefeasibility study into extending its Pinto Valley copper mine in Arizona in the US has increased the mine life, but raised questions over its economic viability at today’s prices.

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Pinto Valley is expected to produce 63,000t of copper at all-in costs of $4,410-$4,631/t this year

The latest study has almost doubled the amount of reserves at the mine, which the company acquired for US$650 million from BHP Billiton back in 2013, with proven and probable reserves now standing at