Abstract: In order to solve the problems of high water hole punching rate，poor lithology adaptability and high blasting cost in the traditional explosive blasting of Tongjie-Manjiazhai open-pit mine，and fur⁃ ther improve the blasting technology level，ensure the safety of operation and reduce the production cost， the mine introduced the JWL-S type on-site mixed emulsion matrix production equipment and process of Shenzhen Jinaobo JWL-S from April to July in 2024，and applied the on-site mixed emulsion explosive to the deep hole bench blasting operation.In the research process，the performance indexes such as explosive density，temperature and detonation velocity were monitored by means of measuring cylinder method，ther⁃ mocouple and detonating cord method.The control variable method is used to carry out the test in two stag ⁃ es (60 blastings of 14 platforms are completed ).In view of the different lithology areas such as marble， skarn and schist in the mining area，the key blasting indexes such as hole network parameters，explosive unit consumption，charge structure and filling length were systematically optimized.The results show that the on-site mixed emulsion explosive has reliable performance (average density of 1.147 g /cm3，average detonation velocity of 4 300 m/s)，forming a blasting parameter system suitable for the actual working con ⁃ ditions of the mine.After optimization，the hole punching rate is reduced from 27%to 5%，the unit explo⁃ sive consumption is reduced from 0.45 kg/m3 to 0.40 kg/m3，and the annual production cost is reduced by 6.2 million RMB per year according to the annual blasting volume of 10 million m3.The bulk rate is con⁃trolled within 2%，and there is no obvious root residue.The research conclusion confirms that the on-site mixed emulsion explosive is suitable for the complex working conditions of multi-lithology and high-water holes in the mine，which can realize standardized and large-scale application，and significantly improve the safety，economy and efficiency of mine blasting operation.

Key words: open-pit mine, on-site mixed emulsion explosive, blasting parameters, explosive perfor? mance optimization, blasting cost