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。
The utility model has the advantages of simple structure, low cost, flexible operation and accurate drawing, and is an ideal drawing tool for bench workers, metaler and line drawing workers.
本实用新型结构简单，造价低廉，操作灵活，制图准确，是钳工、钣金工、画线工的理想制图工具。
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