Abstract: Husab Uranium Deposit is characterized by complex orebody shape,unstable thickness and uneven distribution of useful components.When openpit mining method is adopted and geological resource model is used in blasting design of blasting area,due to the low precision of model,the boundary between ore and waste rock is not accurate enough,the expected blasting effect is often not achieved,resulting in high dilution rate and loss rate of mining.The grade control model is established based on the hole grade data of a single blasting area.The model has the advantage of high accuracy,which can reflect the actual distribution of ore and waste rock in the blasting area more accurately,and provide reliable basis for blasting design.Since the borehole grade data can only be obtained after drilling and logging,the traditional blasting process needs to be optimized.Under the condition that the boundary line between ore and waste rock is clear and their distribution is relatively concentrated in the blasting area,the blasting separation of ore and waste rock can be realized by changing the blasting charge,charging structure and connecting mode,and further reduce the mining dilution rate and loss rate.On the basis of the study of grade cotrolling model,the original blasting process is optimized,and the separation blasting test is done by selecting the proper blasting area.The test results show that the dilution rate of the blasting area is effectively reduced by the optimization of blasting process.The study results indicated that the blasting design process optimization of Husab Uranium Mine based on grade control model can effectively improve the mining quality and efficiency,and basically meet the requirements of modern mine fine management.

Key words: mine blasting,Husab Uranium Mine,grade control model,blasting design,process optimization,mining dilution and loss