Among the most sensitive asset classes to monetary easing is gold, the yellow metal that trades inversely with the U.S. dollar and is seen by many as an inflation-hedge.

FORBES: Bernanke And Draghi Add Fuel To Gold's Fire, Even Miners Rally

Few maps are made of where the mines are laid, and since the home-made varieties contain very little metal, they are extremely difficult to detect and so sensitive that even sniffer dogs can detonate them.

BBC: Farc rebels have been fighting the government for decades