The Balkans have been an important area for mining activity in Europe for centuries. In this drone video by contributor Alex_Markov, you'll get a bird's eye view of a modern copper mine in Bulgaria. The Elastite is situated in the Sofia province in the western part of the country. Operated by the Geotechmin Group, it's estimated to have 650 million tons of recoverable ore. With an average grade of .3%, that translates into about 2 million tons (about 2 billion kg or 4 billion lbs.) of the red metal.