Why there are still conflict minerals in our electronics

The minerals tin, tantalum, tungsten and gold are found in most consumer electronics, and are mined in the Democratic Republic of the Congo, which contains an estimated $24 trillion in untapped mineral resources. Yet the DRC remains one of the poorest and most dangerous countries in the world, and mining these metals can help fund armed conflict in the region. Despite international attention and widespread regulations, it's still hard to know exactly where our minerals are coming from.