In relation to the reaction of substances, to react in a manner that directly creates a hazard due to the reaction:
(a) being violent; or
(b) producing an explosion; or
(c) producing a potentially explosive combination of products; or
(d) producing potentially dangerous quantities of toxic vapour or gas.

Reactive ground is rock that undergoes a spontaneous exothermic reaction after it comes into contact with nitrates. The reaction of concern involves the chemical oxidation of sulphides (usually of iron or copper) by nitrates and the liberation of potentially large amounts of heat. The process is unpredictable and can be so violent that it results in mass explosions.

A term used to describe the re-entry of water back into a blast hole after it has been dewatered.

A 'red hat' or 'red cap' is a common name for a plastic plug used to block off a drill hole.

Short holes are often identified when measuring a pattern of drill holes for depth (dipping).

Where the number of short holes is excessive it may be necessary to drill new holes close to the original short hole.

(The alternative is to run the drill back down the original hole but this us not common practice owing to misalignment issues)

The new holes are called 'redrills' and the original short holes are abandoned.

Redrills are often identified with a specific naming convention. Here is it _RD.

Redrills and abandoned holes should be shown on the charge plans to ensure

• redrilled holes for loading are properly identified
• short holes that are redrilled are not loaded
• abandoned holes are properly identified for backfilling
• abandoned holes out of position are not loaded.

Drill pattern showing abandoned holes (K243, K202) and redrill holes (K243_RD, K202_RD)

Are training providers delivering training courses accredited by the State or National Vocational Education and Training (VET) regulator. RTOs conduct Workplace Health and Safety courses and other industry related training.

The authority in each State or Territory of Australia charged with the administration of the acts or regulations of that State or Territory concerned with the control and regulation of explosives.

Relative effectiveness factor or R.E. factor is a measurement of an explosive's power for military demolitions purposes. It is used to compare an explosive's effectiveness relative to TNT by weight only, TNT equivalent/kg (TNTe/kg). This enables engineers to substitute one explosive for another when they are calculating blasting equations that are designed for TNT. For example, if a timber cutting charge requires 1 kg of TNT to work, it would take 0.42 kg of ONC, 0.6 kg of PETN, 1.25 kg of ANFO, or 2.22 kg of AN to have the same effect.

A hole drilled in close proximity to a hole containing a misfire, which when fired will either sympathetically initiate or dislodge the explosives in the misfired hole.