The Congo Mines That Supply "Conflict Minerals" For the World's Gadgets

Most people who own a smartphone—or a laptop, or a new car—aren’t familiar with tantalum, the rare, blue-gray metal that conducts electricity through these devices. But thanks to skyrocketing demand from electronics makers, tantalum—along with a handful of other rare minerals—is an incredibly sought-after metal. And… » 9/20/13 12:40pm 9/20/13 12:40pm