Minerals Sourcing+Minerals Supply Chain Mapping (Step 1.C.2.1)+methodology

Companies that publish their minerals supply chain will typically do so on their websites, or if they have published a Conflict Minerals Report [see EDGAR SEC filings here], Smelters and Refiners are often listed there.Companies should not just say they have mapped their supply chain, but you should be able to find the names of suppliers in a list orl map.
Any additional details such as level of mapping (how many and which supplier types), can be added to the Comments field.