New techniques in blast monitoring and optimization

CIM Bulletin, Vol. 77, No. 867, 1984

CHRISTOPHER J. PRESTON and NORMAN J. TIENKAMP Technical Specialists Du Pont Canada Inc.

This paper describes the use of electronics for physical measurement and computer analysis in both open-pit and underground mining operations for the ultimate purpose of optimizing production blasts. Techniques in monitoring single borehole blasts using both pressure and vibration sensors to establish in-situ dynamic rock properties are outlined, including characterization of multiple borehole production blasts with regard to stress generation. Once field derived measurements are computer analyzed, they are channelled as input parallel to other data, such as the explosives thermochemical performance properties generated by a sophisticated computer program called "HT-65" into BLASPA. BLASPA, a blast simulation computer program, then couples these input with a mathematical model which defines the blasting processes. Aspects such as the blast geometry, explosive loads and distribution, hook-up, and costs are studied. The final output table gives specific blast performance or quality factors for each blast procedure. These results are then easily compared and rapidly optimized to achieve maximum performance at lowest blasting and drilling cost.

Mots Clés: Open-pit mining, Blast monitoring, Optimization, Seismic monitoring, Computer simulation