Do the Math Trolls lol. Patience Pays . Euro Sun Mining is a publicly listed development-stage mining company focused on unlocking value through the responsible development of the Rovina Valley Project, one of Europe’s largest copper gold projects. The Rovina copper and gold deposit located in west-central Romania, is the second largest in Europe and holds about 400 million tonnes of confirmed resources containing 7.0 million ounces of gold and 1.4 billion pounds of copper.