Storm hits Wesfarmers, Xstrata coal exports hard THE impact of cyclone Oswald on Queensland's coal exports continues to worsen, with Xstrata and Rio Tinto warning customers they cannot guarantee contracted shipments and Wesfarmers cutting its full-year coal sales forecast by 500,000 tonnes. Wesfarmers, which produces coking coal at the Curragh mine in Queensland, revealed yesterday that recent rainfall had hit mine production and rail and port availability.