The longhole drill and blast process has long been affected by inaccurate drilling. Reduced ore recovery, significant dilution and increased occurrences of oversize are all common consequences of even the slightest hole inaccuracy. This .Longhole Drill and Blast: A Benchmarking Study. thesis is based on an electronic industry survey, sent via email to a number of mining operations that use the longhole drill and blast process within Australia. In collating this information, a comparison of the various drilling and blasting KPI.s has been drawn between Australia.s leading underground hard rock mines to establish current .best practices. and highlight those areas of the longhole drill and blast process in need of improvement.
The survey results highlighted a number of key areas for focus which include personnel and the operators influence on hole accuracy, equipment selection and fitness for purpose, secondary blasting and current surveying techniques. In addition, the area of risk is discussed, focussing on potential hazards as identified through a comprehensive risk analysis. Finally, based on the collated survey results, a number of recommendations have been made as to how those problems associated with the longhole drill and blast process may be solved.