Abstract: A copper gold deposit is a large deposit in Serbia,with an ore reserve of about 40 million tons,copper metal about 1.2 million tons and gold metal about 78 t.The mining method for above -140 m elevation is approach cut-and-fill mining method.In the case study of -85 m level,logging and sampling in underground projects such as the mining approach and transverse drift are carried out,and grade control model is constructed that precisely controls the boundaries of UHG,HG and LG ore bodies.The paper compares and analyzes the differences between the grade control model and the resource model,and discusses the significance of grade control in guiding mining and processing,optimizing mining engineering design and saving mining costs.Based on that,the paper put forward the ideas and methods for future grade control work in the mine,laying the foundation for future production and geology work of the mine.