materials that we're talking about, tin, tungsten, gold, they are on the surface. you can use any labor to collect it and it is profitable for them. >> reporter: intel's goal was to create a tagging and audit system. they are worked with smelters and refibers around the world to verify the origin of material. >> we can do our part. we're engineers and engineers are taught early in their education that you solve complex problems by breaking them down into pieces. we worked through and understood how much of the materials we get come from the drc, where are the smelters. we broke it down by material anded they these will be easier. gold was going to be tougher. we don't buy as much gold as the