Sunstone Metals Limited engages in the exploration and evaluation of gold and copper properties. It holds an 87.5% interest in the Bramaderos project covering an area of 4,959 hectares located in Loja Province, southern Ecuador; and a 74.5% interest in the El Palmar project located in the northern Ecuador. The company was formerly known as Avalon Minerals Limited and changed its name to Sunstone Metals Limited in September 2017. Sunstone Metals Limited was incorporated in 2006 and is headquartered in Melbourne, Australia.