Sponsor The African country of Rwanda is the world’s biggest supplier of tantalum: a rare mineral used to make capacitors found in devices like smartphones and laptops. Goal To prove beyond doubt that every bag of tantalum ore from Rwanda was mined, transported, and processed under OECD-approved conditions, without any child or slave labor. Approach • Engage stakeholders across the supply chain • Map the tantalum supply chain • Create foolproof new processes • Build a blockchain as solid as a rock • Prove the system in production Results Created by UK-based Circulor, the blockchain-based system to trace tantalum went live in three mines and an ore-sorting facility in Rwanda in fall 2018. “We’re getting an awful lot of traceability for very little extra work,” says Ray Power, CEO of

Join for free to read