Abstract: The limestone resources within open-pit mining boundary of Xigou Mine are divided into three grades including flux limestone， grade BI cement limestone and grade BII cement limestone， according to the contents of CaO and SiO2. Before the completion of capacity expansion in Xigou mine， the utilization rate of resources was relatively low due to the capacity constraints and the mining technical conditions. In recent years， in order to meet the needs of different customers on limestone products， improve market competitiveness， and efficiently make use of and save the limestone resources， investigation on the application of the digital mining technology， the rule for the ore dilution and the reasonable caving-stripping method are carried out. Through surveying the customer’s demand on limestone products and the relevant quality standards， the complete production process system was established and the quality control system of limestone products was formulated. Based on the original common flux limestone and the cement limestone powder， the high-grade limestone blocks for stainless steel converter have been successfully prepared， and meanwhile， low-grade ores can be recovered and utilized， which can greatly increase the recovery rate of the ore and significantly improve the mining benefit.

Key words: Molten limestone ore, Digital mining, Process optimization, Quality control, Comprehensive utilization of resources