A method of Multielemental Instrumental Photon Activation Analysis (IPAA) of copper-molybdenum ores and its products processing using microtron bremsstrahlung is described. The activities of the irradiated samples were measured by means of Ge(Li) and HP-Ge-detectors. Quantitative determinations of elements were performed on standard reference materials. This method allows the determination of 10–24 elements in the samples. The results of these IPAA measurements are compared with the data of the Mongolian reference materials of copper-molybdenum ores and the products of processing.