Abstract: The multiple working faces drill synchronously，overburden strata ore-drawing and waste rock filling of the high end wall non-pillar sublevel caving method is proposed to solve the problems of large difficulty of mining，poor safety conditions and low productive efficiency existed in practical production of the fluorite mine in Xilinhot City.The suitable caving parameters is given,the change rule of sidewall strata movement of the collapse pit is analyzed by adopting the surface detection method and test method.The collaborative waste rock filling method is proposed to enhance the stability of sidewall and the loose body,and the some relative tests are done in the experiment stope in the fluorite mine in Xilihot City.According to results of the regular shift recordings,the recovery rate is improved to 94.18％,and the degree of caving ore lumpiness is good,which is consistent with the previous analysis in this paper.The above study results further show that the recovery indexes obtained by the optimization model established in this paper are good,and the mining problems of the steeply inclined and medium thick ore-body can be solved effectively.

Key words: Steeply inclined medium thick ore-body, High-end wall pillarless sublevel caving method, Collaborative rock filling, Numerical calculation, Lumpiness