Audit frameworks at refinery level now overlap to the point of redundancy. That is progress. It also means the residual risk sits almost entirely in the segment between the pit and the first aggregator, where documentation is created rather than checked.
Where paper starts
A chain of custody can only be as good as its first record. If the first buyer writes a weight and an origin on a receipt without verification, every downstream audit is validating that receipt rather than the metal.
What credible looks like
Geolocated purchase records, assay at point of purchase, and a payment trail that reconciles to the tonnage. It is not complicated. It is simply expensive, and nobody has agreed who pays.
Cost is the reason nobody moves first
Geolocated purchase records and assay at the point of purchase are not exotic technology; the barrier is almost entirely commercial. Requiring a first buyer to fund verification equipment and additional staff time raises their cost base relative to a competitor willing to buy on trust, and in a fragmented, competitive buying market that cost is very difficult for any single actor to absorb unilaterally. The result is a collective action problem: the entities best placed to pay for upstream verification, the large downstream refiners and jewellery brands, are furthest removed from the point where the cost would actually be incurred.
Some larger buyers have begun experimenting with financing the verification infrastructure directly, effectively paying a premium for documented origin at the first point of sale rather than relying on the aggregator to absorb the cost. Where this has been tried, it appears to improve compliance meaningfully, though it remains a minority practice rather than an industry norm.
Why self-declared origin will keep failing audits
A due diligence framework built primarily around a supplier questionnaire and a self-declared certificate of origin tests paperwork consistency, not the underlying claim. Sophisticated non-compliant supply chains have adapted to exactly this style of audit by ensuring their documentation is internally consistent, even where the metal itself has passed through several undocumented hands before the first paper trail begins.
Closing that gap requires audits that test physical and transactional evidence, not just documentary coherence: matching purchase volumes against plausible site production capacity, cross referencing payment records against declared sellers, and treating any first-buyer record that cannot be independently corroborated as a gap in the chain rather than as evidence in its favour.
