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Blended Explosive

A blended explosive generally refers to a mixture of ammonium nitrate and emulsion. A range of blends are available from straight ANFO through a 50/50mix to straight Emulsion.

Blends containing more ANFO than Emulsion are known as Heavy ANFO's or HANFO

Blends containing more Emulsion than ANFO are known as Doped Emulsion

Blends containing more than 40% Emulsion have good water resistance and where Emulsion content is over 50% the product is considered suitable for loading into fully wet holes.

Blends containing more than 50% Emulsion generally need to be chemically gassed for sensitivity.

Block Slide Failure

A block slide is a translational slide in which the moving mass consists of a single unit or a few closely related units that move downslope as a relatively coherent mass.

all failures gloss


Resembling a block in shape.


A cap-sensitive explosive with a high VOD used generally in small quantities to rapidly attain and maintain a high rate of detonation through the main charge.
Generally refers to a cast booster containing Pentolite.

booster bb

Bottom Fire Detonator

Electric detonator for firing from the bottom of a perforating gun.

May be fluid sensitive of fluid resistive

Bottom fire detonator

Box Cut

A pattern of holes adopted for blasting to a new level below an existing floor or below existing surface mining.


The ability of an explosive to break or shatter rock by shock or impact as distinct from gas pressure.
The shattering effect of the energy released in an explosion.

Bulk Strength

The explosive strength value of a unit volume of an explosive material expressed against a standard reference such as ANFO.

Bulled Hole

A blast hole which has been enlarged (chambered) to accommodate extra explosive over a portion of its length (usually at the bottom) by exploding a small charge.


The burden is the distance between a blasthole which is to be fired and the nearest void or free space.

Note that two burdens are defined, the drilled burden as shown in the diagram and the dynamic burden which is the true burden at the instant the hole fires.

The dynamic burden is influenced by both the drilled burden and the delay timing.

Drilled Burden

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Skip Manage Drill and Blast Operations 5 DAY MASTERCLASS