长江有色：26日氧化铝期价涨0.37% 今日成交缺乏亮点

Group 1 - The core viewpoint of the articles indicates that the alumina market is experiencing significant fluctuations, with the main contract closing at 2732 yuan, reflecting a slight increase of 0.37% despite a backdrop of declining spot prices in various regions [1][2] - The trading volume for the main contract increased by 35.46% to 693,294 lots, while the open interest decreased by 5.31% to 678,730 lots, indicating a mixed market sentiment [1] - Domestic spot prices for alumina showed some declines, with prices in South China reported between 2680-2730 yuan per ton, down by 10 yuan from the previous day [1] Group 2 - On the fundamental side, Rio Tinto plans to reduce production at its Yarwun alumina refinery in Australia by 40%, affecting 1.2 million tons of capacity, which may provide some support to alumina prices [2] - The supply side is characterized by a marginal increase in Guinea's new mine shipments and a recovery in domestic bauxite production, leading to an expected increase in domestic supply [2] - The overall market remains oversupplied, with cost pressures from declining caustic soda prices further weakening support for alumina prices, while the current production capacity is insufficient to alter the supply-demand balance [2]