"Good Delivery Bars" is the internationally accepted trading standard used by gold dealers, traders and bullion banks around the world to trade and deal in gold and silver.
Each bar is marked with the fineness, the year of production, the serial number and the refiner's assay stamp .
GOLD : Minimum gold content > 350 troy ounces (≈10.9 kg)
Maximum gold content > 430 troy ounces (≈13.4 kg)
SILVER : Minimum silver content > 750 troy ounces (≈23 kg)
Maximum silver content > 1100 troy ounces (≈34 kg)
These gold and silver bars are produced by some of the most respected refineries and mining companies in the world :
Since their manufacturing, bars are kept in bullion vaults recognized and monitored by the local gold dealing community. They are accurately assayed and guaranteed to always contain 99.5% pure gold or better. So the gold/silver keeps its maximum value for resale.