Black rock as an important carrier of platinum group elements was discovered in recent years. Due to the multiple origins and complex mineralization,the distribution and occurrence of platinum group elements in black rock are not clear,which is also the major reason why the analytical results of platinum group elements are unstable.According to the mineral properties and composition of black rock,the occurrences of Pt,Pd and Au in black rock could be divided into exchangeable phase, organic binding phase,su...