Abstract: In view of the hole layout mode and drawbacks of an open pit iron mine,GPS technology was introduced and applied to mine blasting design and hole layout,and field experiments were carried out.The results show that using GPS technology to distribute holes can greatly improve the layout accuracy of holes,and the operation is simple.The work efficiency is also greatly improved compared with before.It meets the requirements of fine blasting in mines and improves the final blasting effect.According to field statistics,the final blasting block rate is reduced by 40%,and the waiting time for processing blocks is reduced,which meets the requirements of mining and assembling in open pit mines and achieves good economic benefits.

Key words: Open pit iron mine, GPS technology, Fine blasting, Hole layout