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acicular Aerosol 22 Agreement alluvial arsenopyrite buffer stock cassiterite cassiterite crystals cassiterite flotation Catavi cent Sn chalcopyrite chemical chlorite collector colour columbite containing Cornwall Department of Mineral dredge dressing economic effect feed feldspar Figure formation fraction Geological Survey grade grains granite heavy minerals ilmenite International Tin Council investigation ions jigs Khorat killas Magnetic concentrate magnetic separation Mainly ilmenite material mesh metal method microns Mineral Resources mineralogical monazite Non-magnetic tails occur oleic acid operation oxide palongs particles Phang-Nga phosphonic acid Phuket plant problems production pyrite pyromorphite quartz Rapidex reagent recovery rocks rotor sample sampler scheelite shows slag slime smelting SnO2 South Crofty south-west species sphalerite stannite sulphide surface Table techniques tests Thailand thin section tin concentrate tin deposits tin lodes tin mining tinplate tion tons tourmaline trace trace wall-rock West Malaysia Wheal wolframite wood-tin zeta potential zircon zone