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Tunnel Blast Design - hkieged.org
www.hkieged.orgBurn Cut Minimum Area of LD Blastholes Required 0 50 100 150 200 250 300 350 1.01.5 2.0 2.5 3.03.5 4.04.5 5.05.5 6.0 Blasthole Depth ( m ) Minimum X-Sectional Area of LD Relief Blastholes ( cm