Gold Ten Futures, May 21, the main contract of alumina rose by the limit, and the main contract of Shanghai aluminium rose by more than 2%. On the news, Rio Tinto Group announced force majeure factors for the shipment of alumina from the two smelters of Australia's Yarwun Smelter and Queensland Alumina Co., Ltd., saying that there is a shortage of natural gas inventory/supply for power generation. For the market outlook, South China Futures said that the financial impact is greater than the fund...