strutsubdrillingsublevelsublevel caving methodsublevel stoping methodsubsequent riverssubsieve sizingsuccessive approximation principlesuccessive slipsuction pipesuction strokesudden outburstsumpsuperelevationsupergenesupergene enrichmentsupergene oresuperposed riverssupportsurcharge anglesurface chargesurface explorationsurface miningsurface mounted drillsurface tensionsurface wavessurgesurveysweet roastingswelling dowelswelling factorswelling groundswelling rockswing angleswitch back road systemswitch gearswitch houseswivelsymmetrical foldsynclinesynclinoriumsyngeneticsyngenetic depositssyngenetic dispersionsystematic errorsystematic jointssystematic sampling