Sunstone Metals Limited (ASX: STM) is involved in the exploration work of mineral resources. The company’s Bramaderos Gold-Copper project (in a joint venture with Cornerstone Capital Resources) is situated in Ecuador and contains great potential for gold-copper resources. Its other project, the Southern Finland Gold Project holds a significant gold deposit. It also has a substantial equity investment in Copperstone Resources AB, Sweden. The company was earlier known as Avalon Minerals and is headquartered in Australia.