[Guinean Alumina signs Agreement with Chinalco to build Alumina Refinery in Guinea] Guinea Alumina Corporation (GAC) signed an agreement with Chinalco to build an alumina refinery in this West African country. The cooperation between GAC and Chinalco began with the signing of a memorandum of understanding in March to make full use of the experience of the two companies in alumina refining, GAC said in a statement. (Bloomberg)