Abstract: Pillarless sublevel caving mining method has been used widely in the mine both at home and abroad, which is difficult to control the loss of ore dilution in the practical production. However, the loss and dilution index depend on shape of falling ore ellipsoid. So it is significant to research the falling ore ellipsoid shapes to control the ore loss and dilution. Combined with the project of stope structural parameter optimization of Shouyun iron ore, design parameter of stope was analyzed. Through indoor physical simulation test, the changing laws between drift width and ore ellipsoid shape was uncovered.

Key words: Drift width, Shape of falling ore ellipsoid, Recovery rate of ore