Research shows that main cause of ore dilution in sublevel caving mining is tlnrational cut-off grade drawing.Non-dilution ore drawing is most ideal drawing mede.

• 研究表明，造成无底柱分段崩落法来出矿石贫比大的根本原因在于采用了不合理的截止品位放矿方式，无贫化放矿是无底柱分段崩落法最为理想的放矿方式。