The issues of the possibility of conducting online monitoring of ores on tape technological conveyors of LLC «Kazakhmys Corporation» by the EDXRF method using an ore-controlling station (OCS) with an ore size of -300 mm class were discussed. Objects of monitoring: copper-containing polymetallic ores arriving for processing at the Zhezkazgan, Balkhash and Karagailinsky dressing mill (monitoring elements: copper, zinc, lead, silver, cadmium and iron), as well as transported via the underground main conveyor of the OCS RLP-21T. The main requirement for OCS is a reliable determination of silver contents in the range of 1+ ppm. The technical issues of the OCS RLP-21T device, the results and results of production operation are highlighted.