A preformatted risk identification card completed at the start of an activity.
The card generally contains a generic series of questions about the commonly present risks such as, Can I fall?

A common example of this is the 'Take 5' system.

The resistance of explosives to temperature effects depends on the type of explosive, the temperature the explosive is exposed to and the amount of time.

Timing contour plots or relief maps are used to analyse timing for a blast.

The plots show equal firing times at specific intervals.

The spacing between contours is an indication of relief.

Relief is calculated in terms of milliseconds per meter (ms/m)

For example where the 100ms and 200ms contour lines are 8 meters apart the relief is 100/8 = 12.5 milliseconds per meter.

Where contours are close together timing is slower with increased relief.

Note that direction of movement of the fired material is generally at right angles to the contours.

 Trinitrotoluene, TNT, or more specifically, 2,4,6-trinitrotoluene, is a chemical compound with the formula C6H2(NO2)3CH3.
This yellow-colored solid is best known as a useful explosive material with convenient handling properties.
The explosive yield of TNT is considered to be the standard measure of strength of bombs and other explosives.

The junction of the face and the floor. Also, unbroken rock remaining at the junction of the face and floor.

A top fire percussion detonator is designed to function without any electrical connection.

Fires from the top of the gun.

Owen Oil Tools’ Resistorized Bridge Detonators are designed to detonate when an electrical current greater than 0.2 amps is applied. The 008 Top Fire Detonator is a resistorized electrical detonator manufactured to API RP-67 recommendations and employs a 51 Ohm resistor in the firing circuit. It is designed to be used in hollow steel carrier or scalloped gun systems in a top-fire application where the detonator has a directional output designed to initiate a bi-directional booster.

Tramp Material (Also known as Foreign Bodies) not intended to be present in a process (such as bolts, nuts, gravel, etc), that can have an adverse effect on the process and may cause an undesired event or deviation from the design intent.

A figure with two parallel sides.

The surface line of detonating cord or signal tube between connecting blast holes.