Abstract:

Cangshang mining district of Sanshandao gold mine is an alteration-type gold deposit formed in low-middle tempreture hydrotheromal filling riftzone,whose fissure is rather complex.Rocks are so unstable that once detonation wave of emulsion explosive run into these structures,echoattenuation comes into being,resulted in the increases of boulder frequency as well as loss dilution.From seven aspects of theory and practice, the reason of revetment, islet,bedrock and block produced in explosive of fissure ore-rock with multiple joints was analyzed based on the physical situation in excavation plant. Appropriate solution was proposed by changing the explosice metarials type, perforation direction,and the detonation way.The boulder frequency was decreased from 11% to 1%, and the loading efficiency increased by 21.2%.The 10% of processing ore amount was more than that original without any additional devices,which can bring significant economic benefits, and is of general significance.

Key words: Multi-jointed fracture ore-rock, Blasting quality, Alteration type gold deposit, Cangshang mine area, Sanshandao gold mine, Shandong Province