Mines extracting the metals from oxide ore typically use 3.5 to 4.5 tonnes of sulphuric acid for each tonne of copper produced, according to consultants Roskill.Congo produced about 1.4 million tonnes of copper and almost 90,000 tonnes of cobalt in 2019, the central bank said.Regional demand for sulphur rose in the past 18 months as new mines opened, smelter shutdowns squeezed supply and some mines opted to produce their own acid to cut freight costs, said Cherryl Thomas, Africa sales manager at reagent supplier Axis House.
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