Western Australia manufactures and imports large amounts of ammonium nitrate (AN). It is predominantly used as a precursor for WA’s bulk mining explosives (more than 99%). It is also used as a nitrogen fertiliser.
AN is classified as a Dangerous Good, Division 5.1 (Oxidising Substance). All safety and security aspects of its manufacture, import, transport, storage and use are strictly regulated under the Dangerous Goods Safety Act 2004.
Summary of hazard
If stored or handled incorrectly, AN has the potential to inadvertently detonate causing a large overpressure. These events can, and have, caused catastrophic damage to the surrounding area and significant loss of life. Although this type of event has not happened in Western Australia, there is a long history of these incidents occurring around the world and in other parts of Australia.
Further to the detonation hazard, if exposed to a fire, AN will decompose and emit toxic gases.