* Q3 iron ore shipments weaker than expected * Oyu Tolgoi ramp-up boosts copper output * Second straight record quarter of bauxite production (Rewrites throughout, updates with details and background) Oct 14 (Reuters) – Rio Tinto on Tuesday reported softer-than-anticipated third-quarter iron ore shipments and warned it would require a vigorous year-end push to attain the lower end of its annual target, even as copper output races to the top of its forecast. Four cyclones have disrupted schedules early this year , prompting Rio Tinto to forecast its 2025 iron ore shipments at the lower end of its 323 million tonnes to 338 million tonnes (Mt) range. The company said the cyclones impacted a total of 13 Mt worth of shipments in the first quarter and that Rio Tinto was on track to recover about

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