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Table B -1. Hoek -Brown strength parameters <br />Rock Type <br />Cripple Creek <br />Breccia <br />Rock <br />Code RQD ( %) GSI <br />oci <br />(MPa) <br />m <br />90 82 <br />70 72 <br />TBX (42) 50 63 68.9 22.4 <br />30 54 <br />10 46 <br />90 65 <br />70 55 <br />Phonolite TPH (21) 50 46 61.5 31.4 <br />30 40 <br />10 35 <br />90 58 <br />70 49 <br />Lamprophyre TLU (6) 50 41 60.6 7 <br />30 35 <br />10 29 <br />