Abstract: With the gradual decline in the head grade of run-of-mine ore, copper mines under Daye Nonferrous Metals Group are facing the challenge of coordinating resource, environmental, and economic benefits. To improve the utilization of low-grade copper ores, increase the feed grade to the grinding circuit, and reduce mill energy consumption, it is necessary to introduce preconcentration technology for waste rejection and equipment for ore sorting. In this study, a STEINERT KSS combined sorting machine, integrating dual-energy X-ray transmission (DE-XRT) and 3 D laser sensor technologies, was used to carry out exploratory preconcentration tests for waste rejection on copper ores from the company's mines. The test results show that the combined sorting machine achieves good preconcentration performance for ores from the Fengshan Copper Mine. Under a waste rejection rate of 12 %, the copper recovery in the concentrate reached 98 %, the copper grade of the concentrate increased from 0.669 % to 0.746 %, representing an 11.51 % increase in grade, and the separation indexes were satisfactory.