Air Liquide Australia Limited has signed a 15-year contract with Comalco Aluminium Limited, a subsidiary of the global mining group Rio Tinto, for the supply of oxygen and nitrogen to its Gladstone refinery in Queensland. Comalco is in the process of building Stage 1 of an AUD$1.4 billion alumina refinery in Gladstone with a capacity of 1.4 million tonnes pa. Air Liquide will install a new air separation unit of 70 tonnes/day capacity to meet Comalco's needs as well as service other industrial customers in Central Queensland.