Equivalent void is the amount of void required to pull a development round using a parallel cut with a single empty or void hole. This may be estimated using the following graph

This shows that for a 3m advance in hard ground a single reamer hole of 125mm would be sufficient.

Once the equivalent void is estimated the equal void using smaller holes can be used in the design.

Any documented and reasonable loss caused by such things as product density changes, spillage, damage to packaging, calibration variances, effects of humidity etc.

Explicit knowledge (also expressive knowledge) is knowledge that has been captured in some tangible form and can be readily articulated, codified, stored and accessed. It can be easily transmitted to others. Most forms of explicit knowledge can be stored in certain media.

Examples of explicit knowledge include:

 - Procedures, work instructions, operating standards

 - Checklists and audit tools

 - Training and assessment material.

The strength of an explosive expressed against a standard reference, eg. ANFO.

Means any of the following events involving an explosive -

(a) an explosive is, or appears to have been, lost or stolen;

(b) an accidental explosion, fire or spillage;

(c) the death of or an injury to a person;

(d) unexpected damage to property;

(e) an event, including a misfire, with the potential to cause any of the events mentioned in
paragraphs (a) to (d), other than an event that normally happens when handling or using an explosive.

A specially constructed store which is used exclusively for keeping explosives. Generally must be licensed by the regulator.

An explosives management plan is the overarching document that describes the manner in which explosives are to be managed on site.

The required elements of an explosives management plan can be found in the following audit tool.

Exposed gun systems, with the individual shaped charges sealed in pressure-tight protective capsules mounted on a carrier strip or links that are exposed to the well environment. 

Exposed Gun Assembley (DNES)

Detonator for Exposed Gun System

A location that may be affected by an explosion somewhere else.

An unintended electrical current from a source other than the firing device which could initiate a detonator including stray currents,
induced currents, static electricity and radio frequency energy.