Abstract:Blasting funnel test is the premise of determining reasonable medium-depth hole blasting parameters. In order to guide medium-depth hole blasting in Sarek Copper Mine, single series blasting funnel tests and multi-hole blasting funnel tests with variable hole spacing were carried out in underground conglomerate area. Single series tests show that the blastability of conglomerate is better with 47.0 cm of the optimum blast hole depth; the variable hole spacing test shows that when the hole spacing ranges from 40 cm to 70 cm, it is easy to form grooves with larger depth and width. According to the principle of blasting similarity, the recommended parameters of medium-depth hole blasting in conglomerate ore body are obtained as follows: the optimum hole spacing is between 1.3 m to 1.5 m, the maximum hole bottom spacing is 2.8 m, the explosive unit consumption is 2.43 kg/m3, and the minimum resistance line is ranging from 1.9 m to 2.0 m, which provide a basis for the design of blasting parameters in the process of sublevel open stope and subsequent filling mining method.