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Tim Casten and Mark Johnson explain how PT Freeport Indonesia is transitioning its Grasberg operations from primarily open-pit extraction to underground mass mining in order to maintain a production rate of 240,000t/d

Tim Casten and Mark Johnson

 Current ore production at the Grasberg district of PT Freeport Indonesia (PTFI) is approximately 240,000t/d. One-third of this production is from the Deep Ore Zone (DOZ) caving mine and from the recently...

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