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" ... A significant limitation in the production of sulphide flotation concentrates has been an inability to reliably separate ore and waste in coarser particle sizes with conventional froth flotation. Consequently, additional costs are incurred - such as energy, water and grinding media - to grind the bulk of ore into very fine fractions (less than 30 microns) to recover metal sulphides and reject waste in the flotation cell. ... "
" ... However, a team of astronomers led by Irwin has now found that hydrogen sulphide definitely does permeate the upper atmosphere of Uranus, according to sensitive spectroscopic observations with the Gemini North telescope on Hawaii’s Maunakea. ... "
" ... Most battery-grade nickel comes from nickel sulphide ores mined in Canada and Australia with a sudden surge in demand from battery makers the major reason why BHP did not sell its nickel division after years of trying to offload the operation. ... "