Experimental Analysis of Constructional Parameters of Nugget Mining in Xiaoguanzhuang Iron Mine

With the mining depth of increased, the sublevel height was increased correspondingly to 125?m from 10?m so as to decrease mining cost. A 3dimensional model experiment was therefore carried out in lab with the intention of determining such constructional parameters as drift intervals and drawing pace to meet the mining requirements after the sublevel height has been up to 125?m. The experimental data were processed through regression analysis, and the regression equations were solved using Matlab programming to express the relationships between drift interval/drawing pace and the rate of ore recovery/rate of rock dropin/rate of undiluted ore recovery. Then, based on such relationships, some suggestions are put forward for the constructional parameters of nugget mining in the mine area, i.e., the optimum combination of drift interval with drawing pace is 125?m×5～6?mafter an overall consideration of various ore recovery indices.