Eco Oro Minerals, formerly Greystar Resources, is a Canadian precious metals exploration and development company with a portfolio of projects in Colombia. It has been focused on its wholly-owned, underground gold-silver project Angostura in Colombia's Santander department, since 1994. This project is formed by the Angostura deposit and five satellite prospects: Mongora, Agua Limpia, La Plata, Armenia and Violetal. Eco Oro Minerals is based in Vancouver, Canada, and was formed in 1997 after the merger of Greystar Resources Ltd. and Churchill Resources Ltd. It adopted its current name in 2011.