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The natural oxidation of iron-sulfide minerals (mainly pyrite) contained in mine waste material can produce the acid rock drainage (ARD). It leads to low acidity, high sulfate and iron concentration in surface and ground water and its heavy-metal contamination. This study investigates ARD prediction for sulfide-bearing mine waste rocks in the Verhne-Krichalskaya area, where the epithermal gold-silver deposit is located (Western Chukotka, Russia). Twenty samples of waste rocks (altered dacites, andesites and rubble...