DIAMOND CORE DRILLING REFERENCE - Boart Longyear

DIAMOND CORE DRILLING REFERENCED imensions, Weights and Q Coring SystemsApril 2014 Copyright 2014 Boart Longyear . All rights reserved. Bit Selection GuideHardnessSoftSoftSoftMohs RocksSoapstone, Coal, Rock Salt, AmberMarble, Shale, Kimberlite, DolomiteSlateSpecialty BitsPCD, TSD, Surface SetPCD, TSD, Surface SetPCD, TSD, Surface SetBLY Alpha 0202, 06 ABR, 07 ABRBLY UMXSSUMXSSUMX, 07 UMXSSUMX, 07 UMX, 09 UMXA tlas Copco3AC7 ACFordiaHero 3 Hero 7 Hayden H3KS5 DimatecD3HR7 Copyright 2014 Boart Longyear . All rights reserved. Bit Selection GuideHardnessMedium HardMedium HardMedium HardMohs RocksSand-stonePegmatite, Pumice, Gabbro, Norite, Obsidian, BasaltDiorite, Magnetite, Hematite, Granite, RhyoliteSpecialty BitsSurface SetBLY Alpha 02, 06 ABR, 07 ABR06 ABR, 07 ABR06 ABR, 07 ABR, 08 ABR, 08 COMBLY UMXSSUMX, 07 UMX, 09 UMXSSUMX, 07 UMX, 09 UMXSSUMX, 07 UMX, 09 UMXA tlas Copco7AC7AC, 11AC11 ACFordiaHero 79-11, Hero 79-11, Hero 9 Hayden KS5H9, KS5H9, H11 DimatecHR7HR7HR10 Copyright 2014 Boart Longyear .

UMX can drop RPM or stall head due to increased torque. See ‘Sharpening #2’, if speed drops/stalls. Penetration rate: Result of WOB, sharpness, bit formula and ground conditions. Penetration rates vary anywhere form 2 - 12 ipm (5 - 30 cpm) based on bit and formation. In extremely broken, hard ground, run at half RPM and

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