Question: Estimate using the Grimstad - Barton chart the rock support requirements for an underground excavation designed to facilitate a sag mill? The requirement span for

Estimate using the Grimstad-Barton chart the rock support requirements for an underground excavation
designed to facilitate a sag mill? The requirement span for this excavation is 15m and the estimate
RMR89 for this area was rated at 65 points.
Estimate using the Grimstad - Barton chart the

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