The homogeneity of a RM reflects the manufacturer's competence to eliminate any nugget effects and provide a homogeneous product that, when analyzed, will provide a consistent result within certain statistical limits. But how homogeneous are the RMs of gold-bearing ores from world-class producers? The report is based on an independent study that evaluated the homogeneity of gold-bearing RMs and is devoted to the study of the problem of homogeneity of standard samples of the elemental composition of gold-bearing ores from world-class producers