Gold refining and assay technology (LBMA good-delivery)

Gold refining and assay technology converts mined or recycled material into bars whose purity, weight and provenance can be accepted in wholesale markets. The London Bullion Market Association's Good Delivery system is the leading private standard for bars admitted to the London market.

Function

Refining removes impurities and produces metal at specified fineness. Assay determines composition and supports the refiner's marks, bar weight and serial identity. Good Delivery rules set technical requirements for bar dimensions, appearance, weight, fineness, marking and refiner performance.

Accreditation is not merely a laboratory test. The LBMA assesses ownership, operating history, production capacity, financial standing, quality management and responsible sourcing. Ongoing monitoring, sample testing and incident review preserve confidence after admission.

Strategic role

The standard links physical metal to Gold custody, vaulting and bullion logistics. A conforming bar from an accepted refiner can circulate with lower verification friction. Removal or suspension from the list does not destroy the gold, but can reduce its marketability, increase re-assay or re-refining costs, and narrow access to banks and vaults.

Responsible-sourcing requirements address money laundering, conflict finance and sanctions risk. They make refinery due diligence a control point against a Gold-smuggling and bullion-laundering channel. However, private accreditation is distinct from a government asset freeze or trade prohibition. Gold-flow and bullion denial may use both legal restrictions and market standards, but the authority and effect must be identified separately.

Assessment

Good Delivery creates network power because acceptance by a central market becomes commercially valuable worldwide. Alternatives exist in other exchanges and domestic markets, so it is not a universal legal monopoly. Its leverage lies in liquidity, trusted provenance and operational convenience.

As at 30 July 2026, an entry concerning a refiner should cite the current list or notice, distinguish accreditation status from sanctions status, and identify any transition period or conditions. Technical non-conformity, responsible-sourcing concern and state designation are different events.

Sources

1. London Bullion Market Association, Good Delivery Rules (accessed 30 July 2026).
2. LBMA, background and high-level principles.
3. LBMA, Responsible Gold Guidance, version 9.
4. LBMA, Responsible Sourcing Report 2022.
5. LBMA, Good Delivery List newsletter and committee updates.