Sunstone Metals Limited engages in the exploration and evaluation of gold and copper properties. It holds 87.5% interests in the Bramaderos project covering 4,959 hectares located in Loja Province, southern Ecuador; and 70% interests in the El Palmar project comprising 800 hectares situated in the Imbabura Province, northern Ecuador. The company was formerly known as Avalon Minerals Limited. The company was incorporated in 2006 and is headquartered in Milton, Australia.