COLORADO STATE BLASTERS EXAM QUESTIONS AND
ANSWERS.
Blast pattern
The plan of the drill holes laid out for blasting.
Composed of the burden distance, the spacing distance,
and their relationship to each other.
Blast Site
Area where explosives are handled for blasting
operations. A distance of 50 feet is required in all
directions from explosive charges, loaded boreholes,
and to be loaded boreholes
Booster
An explosive charge designed to be used in the
initiation sequence between an initiator or primer and
the main explosive charge.
Borehole
Page 1 of 15
, A hole drilled in the material to be blasted that contains
an explosive charge
Burden
Distance from the borehole and the nearest free face
Bus wire
Expendable heavy gauge bare copper wire used to
connect detonators
Charge per delay
Any charges firing within an 8 millisecond time period
are considered to have a cumulative effect on vibration
and air over-pressure effects. They are summed within
8-millisecond intervals
Collar
The mouth or opening of a borehole
Page 2 of 15
ANSWERS.
Blast pattern
The plan of the drill holes laid out for blasting.
Composed of the burden distance, the spacing distance,
and their relationship to each other.
Blast Site
Area where explosives are handled for blasting
operations. A distance of 50 feet is required in all
directions from explosive charges, loaded boreholes,
and to be loaded boreholes
Booster
An explosive charge designed to be used in the
initiation sequence between an initiator or primer and
the main explosive charge.
Borehole
Page 1 of 15
, A hole drilled in the material to be blasted that contains
an explosive charge
Burden
Distance from the borehole and the nearest free face
Bus wire
Expendable heavy gauge bare copper wire used to
connect detonators
Charge per delay
Any charges firing within an 8 millisecond time period
are considered to have a cumulative effect on vibration
and air over-pressure effects. They are summed within
8-millisecond intervals
Collar
The mouth or opening of a borehole
Page 2 of 15
