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The quality of mine drainage from sulphide-containing waste rock dumps is controlled by several factors. To characterize the effects of grain size on acid/neutral rock drainage production, kinetic tests were performed on samples from the Recsk porphyry skarn Cu–Zn deposit in Hungary, an area known to generate ARD. Five columns were used, each containing specific grain size ranges (1–2, 2–4, 4–8, 8–16,...