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Hardrock Mines Steel Tunnel Split Set Rock Bolts 33Mm

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Hardrock Mines Steel Tunnel Split Set Rock Bolts 33Mm

In South Africa mine drifts excavated in high stress rock are typically supported with energyabsorbing rockbolts e.g. cone bolts and Durabar and ductile bolts e.g. split set and cables. The primary bolting method is a ring of 1.2m long bolts and the secondary bolting is a ring of 2.4

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