Smelters and manufacturers that use coltan, tin and tungsten in cars, mobile devices and other electronics can’t be sure the minerals have been extracted without using children or forced labor, according to a new report. And the industry mechanism meant to guarantee responsible supply chains, the International Tin Supply Chain Initiative, has ignored or downplayed failures in the monitoring and chain of custody of mining in the Democratic Republic of Congo, according to report publisher Global Witness. “The scheme many global companies rely on to stop conflict minerals from entering their supp…

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