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Vertical crater retreat VCR also known as vertical retreat mining VRM reduces the cost of mining wide steeply orebodies The stope has a similar shape but instead of small longholes drilled in fans large blastholes are drilled vertically from a top sill to break through into a

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VERTICAL CRATER RETREAT MINING IN THE SUDBURY BASIN Vertical crater retreat mining History The vertical crater retreat mining method is based on C W Livingston s crater blasting theories and was developed by Inco and CIL Inc 14

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Vertical Crater Retreat Blasthole mining is a general term applied to mining methods that employ long hole drilling for the production of ore In most Blasthole methods the ore is blasted into a vertical

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