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mbs, making it one of the deepest mines in Western Australia. Virgin stresses are very high, and many of the excavations developed close to and within the orebody are located within a weak talc-chlorite ultramafic rockmass. The stope and development designs, extraction sequence and support systems are all adjusted to minimise the effects of stress redistribution. The primary methods of controlling the effects of stress have been the conversion to an airleg-based stoping method to reduce orebody excavation widths, stoping heights and dilution, the introduction of an extraction sequence to minimise stress ‘hotspots’ and the use of Threadbar bolts (‘Gewi bars’). The bolts have performed exceptionally well in extreme conditions and have formed the backbone of a relatively low cost and simple ground support system capable of yielding with the rockmass deformations and seismicity associated with mining at depth. This paper discusses the technical aspects, mine designs and test results relating bolt performance to underground conditions. Threadbar Bolts in a Seismically Active, High Stress, High Yield Environment—Otter-Juan Mine, Kambalda