7. Blasting Nomenclature
• Free Face - open area at the rock air interface -
essential that broken rock has a place to go to
avoid energy turning to bad vibrations
• Row - a line up of holes running parallel to the
Free Face
• Spacing - the distance between holes in a row
• Burden - the distance from a row of holes to
the free face - the rock that must be broken
up and moved by the explosive
8.
9. Rock Fragmentation
Rock fragmentation, which is the fragment size
distribution of blast rock materials, is used as a
mining industry as an index to estimate the
effect of bench blasting.