... ,Diorite,Porphyry2000~3200hourSynite,syeniteporphyry,trachyte3500~3900hourBasalt,diabase3500~5000hour Work hoursCacium,sandstone,quarta sandstone1300~2000hourGreywacke2800~4000hourVolcanic tuff3000~9000hourLimestone5000~16000hourKaolin,travertine Leadinsoil,mineral5000 ...