Sunstone Metals Limited engages in the exploration and development of mineral properties. It explores for gold and copper deposits. It holds interests in the Bramaderos gold-copper porphyry concession covering 4,949 hectares located in Loja province, Southern Ecuador; the Southern Finland gold project located to the north-west of Helsinki in southern Finland; and the Viscaria copper project located to the north of the Stockholm in the Kiruna region in Sweden. The company was formerly known as Avalon Minerals Limited. Sunstone Metals Limited was incorporated in 2006 and is headquartered in Milton, Australia.