11. The simplest method of separating ore from gangue consists of picking out the individual crystals of each. 12. This is typically associated with gangue sulfides of pyrite, with subordinate pyrrhotite and other base metal sulfides. 13. Silicate gangue minerals include actinolite, pyroxene, tourmaline, epidote and carbonate-barite assemblages also reported. 14. The washwater spirals separate particles more easily but can have issues with entrainment of gangue with the concentrate produced. 15. Froth flotation is typically used to separate coal particles from ash or particles of valuable minerals from gangue material. 16. At about 13.8 fracturing soon followed, altering the dacite and depositing ore minerals and gangue in the veins. 17. Often, the nature of the gangue is important, as clay-rich native copper ores prove difficult to liberate. 18. In a similar fashion to streamworking, much use was made of water for the removal of the overburden and gangue . 19. In dense media separation a media is created with a density in between the density of the ore and gangue particles. 20. A key objective in the metallurgical treatment of any ore is the separation of ore minerals from gangue minerals within the rock.
