the mountains. >> we're just arriving in numbi. it's one of the largest mines in the area and the most recent one to be certified. >> it's been four years since u.n. forces and the congolese army cleared this area of armed groups, but it's only recently been designated "conflict free". in numbi, we met ombeni chikala, a supervisor at a local tin mine. for 15 years, he's made his living as a miner starting as a digger and working his way up. >> on the day we visited ombeni's mine site, agents logged and tagged a 6 kilo bag of tin, a process required for every single mineral shipment leaving congo to be legally sold in the west. >> have you heard of the dodd-frank law? >> what do you think of it? >> are miners across this region affected by the system of traceability and by the dodd-frank law? >> jean ngerageze is the president of a local mining cooperative. >> we asked jean how miners here were able to make a living before the site was certified. >> did you have the same system six months ago? >> nyabibwe is the mine that was held u

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