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An approach to the setting of danger zones around blast sites is proposed. The approach is based on risk-assessment principles and is useful in setting danger zones where a stand-off distance cannot easily be accommodated and supporting evidence is needed to justify (or otherwise) a reduced distance (or change to blasting specifications) and/or where the consequences of hazard realization are such that increased confidence is required in setting the distance for a danger zone. Flyrock hazard is used to illustrate the approach. The incidence of flyrock is calculated from available data and the probability that a predicted distance will be exceeded is considered. A simplified example of setting a flyrock danger zone is given to demonstrate the usefulness of a risk-based approach compared with a traditional consequence approach.