Golden Star Resources. 

Golden Star Resources Ltd. operates as a gold mining and exploration company. The company owns and operates the Wassa open-pit gold mine, the Wassa underground mine, and a carbon-in-leach processing plant located to the northeast of the town of Tarkwa, Ghana; and the Bogoso gold mining and processing operation, the Prestea open-pit mining operations, and the Prestea underground mine located near the town of Prestea, Ghana. It also holds and manages interests in various gold exploration properties in Ghana and Brazil. The company was incorporated in 1992 and is headquartered in Toronto, Canada.