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The Premarket Brief: Rio Tinto cuts copper costs as miners hold guidance, Dr Martens, Antofagasta, Hunting, James Cropper, Audioboom, B&M, Zegona, Barratt Redrow
Wednesday's premarket news flow was dominated by resilient guidance and margin progress across mining and industrials, with Rio Tinto's improved copper cost outlook headlining a busy morning of trading updates.