Abstract:

Ore loss and dilution caused by blasting design impacts the economic benefit of mine significantly when open pit bench advances to ore-rock border.In order to process blasting design and ore loss and dilution control scientifically，ore loss and dilution control system was proposed combined with back row buffer line and blasting cone.The system consist of data input，parameter setting，ore loss and dilution calculation，sampling data fitting，querying，optimum decision，display and output，and so on.Ore loss and dilution was calculated in 3D space in the system to ensure accuracy.Meanwhile，least square fit was introduced to express the relationship between the location of back row buffer line and ore loss and dilution，which provided the basis of querying and optimum decision.The system was actualized with VS 2010，and the experiment test of an open pit mine in Inner Mongolia shown that it is scientific and effective.

Key words: open pit bench blasting, separately blasting and stopping of ore and rock, rock loss and dilution in 3D space, least square fit, optimum decision