On July 16, Rio Tinto fell 3.28% in pre-market trading, trading at $90.56/share, with turnover of $2.5121 million. The decline was triggered by the company's Q2 operational report showing copper production below market expectations, compounded by broad weakness across the diversified metals and mining sector.

Rio Tinto reported Q2 copper production of 213,200 tonnes, down 7% quarter-over-quarter and slightly below the Visible Alpha consensus estimate of 214,700 tonnes. The shortfall was attributed to an unplanned outage at the Kennecott smelter in Utah, where a furnace failure now requires a full rebuild. The company simultaneously lowered its copper spot cash unit cost guidance to 30-50 cents per pound. While Pilbara iron ore shipments of 85.3 million tonnes exceeded analyst expectations of 83.13 million tonnes and reached the highest level since 2020, the copper miss raised concerns about the company's copper growth trajectory.

Sector peer BHP Billiton also fell 3.97% after reporting Q4 copper production below expectations and issuing significantly lower guidance for fiscal 2027, reinforcing negative sentiment across mining stocks.

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