Abstract:Drift cut-and-fill mining method is used in west ore body of Chambishi Copper Mine in Zambia, part of the ore body is fractured and with argillaceous intercalation in stope, part of holes are fractured and collapsed and is difficult to charge explosive. This lead to lowerSefficiency of charging explosive, low advance per attack, large explosiveSconsumption and lower mining productiveScapacity.SSThrough investigation and analysis of rock character in stope, drilling and blast, testing program of protecting the cracking and blocked holes using pipe and optimize hole-pattern and chargingSparameters accordingly is presented. Some criteria determining if the blsthole need protection, the material and specification of the protecting pipe and optimizationSdesignSof hole-pattern and chargingSparameters are introduced. Field tests are carried out in typical stope. TheStestSresultsSshow that by using the technology of protecting the cracking and blocked blastholes and optimizationSdesignSof hole-pattern and charging parameters accordingly, charging efficiency and advance per attack are increased, blastingSefficiencySofS97% hadSbeen achieved, unitSexplosive and detonatorSconsumption is reduced, brokenSeffects and mining productiveScapacity are improved. Its economic benefits and SpopularizedSapplication in Chambishi Copper Mine are introduced.