These 5 oz .9999 Fine Gold bars are produced by LBMA approved, Metalor, a metal refiner in Switzerland, as a producer of Good Delivery Gold Bars. This designation is reserved for bars that meet the stringent requirements of LBMA. The London Bullion Market Association is a major international trade association with ties to banks, mining production companies, and others involved in producing and holding gold. Any mint or refiner seeking LBMA approval requires a stringent process of best practices. This speaks to the quality of the bullion produced by these mints.