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This paper presents the results of uniaxial compression tests conducted on quartzite samples. The tested quartzite samples consisted of 83 mm diameter cores that were cut to a length roughly twice their diameter. The specimens were cored from a depth of between 68–78 m. The stress–strain and acoustic emission (AE) responses were monitored throughout the tests. The results obtained for the intact specimens are believed to be typical, and are in general agreement with the results of other researchers. The tests produced a recognisable AE peak prior to the peak axial strength of the specimen being reached. The axial stress at which this AE peak occurs corresponds to a value of around 90% of the specimen’s UCS (unconfined compressive strength). This is due to the formation of new fractures and shear mobilisation of established failure planes prior to failure that emits large amounts of AE energy.
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