Customs value for gold and silver concentrates is typically based on transaction value, but because precious metal prices move daily, contracts often use provisional pricing at shipment with final settlement after smelter assay. Importers should document the pricing mechanism clearly in entry paperwork and be prepared to file a post-entry amendment once final assay values are confirmed.

Beyond standard CBP entry requirements, large imports of gold-bearing material may intersect with FinCEN reporting rules if transactions involve monetary instruments or if the importer is a financial institution. Additionally, the IRS and Treasury have specific rules for gold bullion and monetary gold; while ore concentrates are generally treated as commodities, importers should consult legal counsel if the gold content is high enough to approach monetary gold thresholds.