In　this　research,　malachite　particles　with　different　roughness　values　were　produced　by　grinding　malachite　sample　together　with　quartz　(mohs　hardness:　7)　and　montmorillonite　(mohs　hardness:　1–2),　respectively.　Micro-flotation　results　showed　that　higher　recovery　was　achieved　by　using　malachite　particles　of　higher　surface　roughness　as　feed.　The　contact　angle　measurements　demonstrated　that　the　contact　angle　of　natural　malachite　surface　decreased　with　the　increase　of　its　surface　roughness,　while　the　contact　angle　of　malachite　conditioned　with　5　×　10−5　mol/L　sodium　oleate　increased　with　the　increase　of　its　surface　roughness.　It　might　be　concluded　that　grinding　media　can　influence　minerals　surface　roughness,　thus　affecting　the　wettability　of　their　surface　and,　consequently,　the　flotation　performance.　©　2018　Elsevier　Ltd