Determination of the elemental composition of minerals and their derivatives at mining enterprises is important at all stages of materials processing. This paper is devoted to the results of development and application of an online XRF analysis method for monitoring mineral elements on a conveyor of mining enterprises. The paper gives an overview of mining applications in which we have successfully implemented the online analysis based on the CON-X industrial XRF analyzer in lump, ore, charge feed, cake and slag materials on conveyor belt. An evaluation of metrological characteristics achieved in these applications is presented.