Blasting and Explosives Quick Reference Guide 2010 - Dyno Nobel

Underground blast design
Shoulder hole These refer to those holes immediately below the back
perimeter holes.
Burncut The burncut consists of a group of blastholes arranged in a
regular pattern around one or more uncharged relief holes.
The first firing blasthole breaks both into the void offered by
the uncharged relief holes and towards the free face provided
by the tunnel face.
Shoulder Holes
Lifter Holes
Easer Hole adjacent to cut area.
Lifters The blastholes along the bottom of the developed round.
Proper performance of the lifters are essential in achieving
good floor control.
Perimeter blastholes Perimeter blastholes are those which form the boundary of
the tunnel. Explosive loading densities in these blastholes are
generally lower than those in the remainder of the blast, as
their prime requirement is to minimise back-breakage and
provide a good contour.
Perimeter Holes
Burncut
Easer Holes
Knee Holes