smooth blastingsmoothing effectsnub pullysoil horizonssoil water zonesolfatarasolvent extractionsondesonic loggingspacingspallingspalling conditionspanspecific chargespecific drillingspecific energyspecific pressurespecific retentionspecific yieldspeculative resourcesspherical oil agglomerationspiral classifierspiral road systemsplitsplit set dowelspontaneous combustionspontaneous liquefactionspoon failurespot timespotterspotting hoistspout feederspray dryerspringspuding armsquare exploration gridsquare set stopingsqueezing groundsqueezing rockstabilitystability graph methodstabilizerstable gravimetersstable groundstackerstage grindingstand up timestandard cone crusherstandard derrickstandard deviation