Abstract: Aiming at the problems of high safety risk，high difficulty，low frequency and high labor intensity in the original production geological sampling method，combined with the underground production practice of Zhangzhuang Iron Mine，according to the characteristics of mining method，a production geolog⁃ ical sampling method based on blasthole drilling cuttings is proposed. The method includes sample collec⁃ tion，preparation，analysis and grade dilution theory prediction，which has the advantages of easy opera⁃ tion，short sampling time and saving mineral resources. Through practice，this method has better results than the original production geological sampling method，and improves the control degree of stope ore.

Key words: blast hole drilling cuttings, production geological sampling, dilution prediction