Rio Alto Mining Limited engages in the acquisition, exploration, and development of mineral resource properties in Peru. The company explores primarily for gold, silver, and copper ores. It owns interests in the La Arena project, which consists of approximately 20,673 hectares in 44 concessions located in north central Peru. The company was formerly known as Mexican Silver Mines Ltd. and changed its name to Rio Alto Mining Limited in July 2009. Rio Alto Mining Limited is headquartered in Vancouver, Canada.