公开(公告)号：EP2558814A4

公开(公告)日：2015-08-26

申请号：EP11768287

申请日：2011-04-15

申请人： ORICA INT PTE LTD

发明人： BRENT GEOFFREY FREDERICK ,  GOSWAMI TAPAN ,  NOY MICHAEL JOHN ,  DARE-BRYAN PETER

IPC分类号： F42D1/08 ,  E21C41/22 ,  E21C41/30 ,  F42D1/055 ,  F42D3/04

CPC分类号： F42D3/04 ,  F42D1/055 ,  F42D1/08

摘要： A method of blasting rock, in mining for recoverable material, comprising drilling blastholes in a blast zone loading the blastholes with explosives and then firing the explosives in the blastholes in a single cycle of drilling, loading and blasting. The blast zone comprises a high energy blast zone in which blastholes are partially loaded with a first explosive to provide a high energy layer of the high energy blast zone having a powder factor of at least 1.75 kg of explosive per cubic meter of unblasted rock in the high energy layer and in which at least some of those blastholes are also loaded with a second explosive to provide a low energy layer of the high energy blast zone between the high energy layer and the adjacent end of those blastholes, said low energy layer having a powder factor that is at least a factor of two lower than the powder factor of said high energy layer. The high energy blasting method provides improved rock fragmentation through increased explosive energy concentration while simultaneously alleviating deleterious environment blast effects.