Sequencing of large underground firings is a critical aspect of blast
performance. Using theory developed in open cut operations, where blast
results are easier to quantify, a new technique for sequencing underground
mass blasts has been developed. The basis for the technique is to identify
timing regimes to control fragmentation and relief then apply non-electrics
to fit these criteria. The use of computer software to graphically interpret
delay statistics enables the evaluation of designs in a realistic manner.