From World Leader in Underground Blast Design Software

A technique first developed in South Africa in very deep gold mines. Stress behind a working face of a stope can increase to a maximum at some distance behind the face and then falls off at distance. Destressing this high concentration of stress means drilling holes and loading them with explosives to shatter the transmission zone of that specific stress. High values of stress are not able to be transmitted through broken zones of rock. Stress would be virtually 'thrown back' into the rock mass at some distance from the working face, thus removing the potential danger of outbursting. Optimum methods of positioning the holes and explosive loads depend on the rock type and structure.