Paragraph 10 I1

Where potassium chloride is extracted, separated, and purified to produce potash and high-grade soluble potassium chloride: sub-surface mining of sylvinite and other halite minerals, separating potassium chloride from those minerals and purifying it including crushing, grinding, froth flotation, drying, compacting, grading and, where relevant, recrystallising it from supersaturated brine.