Casted gold bars are the result of a simple authentic manufacturing process where molten gold is poured into a pre-formed mold. Because the mold is removed after solidifying the gold, these have been cast Gold bars often a rougher and less detailed appearance.
Unlike cast bars, minted gold bars are the result of a more sophisticated production process. These bars are manufactured by cutting gold from a roll and then pressing or stamping it, similar to minting a coin. This leads to a gold bar with a sleeker, more refined finish, often accented with detailed etchings. Despite the difference in production process and external shape, there is no difference in value between the two gold bars.
Read more in the Starter's Guide – What do I buy??