Doré is an unrefined alloy of gold and silver (typically 60–95% precious metal) produced by smelting at the mine site, while concentrate is a beneficiated ore product with much lower precious metal content by weight. Doré is classified under precious metals headings in the HTS, whereas concentrates fall under ore/concentrate headings — a distinction that affects duty treatment, security requirements during transport, and the applicable refinery terms.

Streaming agreements transfer the right to purchase future production at a fixed price to a financier, while offtake agreements commit a mine to sell output to a specific buyer. Both create contractual obligations that must be reflected in export documentation — particularly the declared buyer and transaction value — and can complicate customs valuation if the contract price differs from spot market value at time of export.