DETERMINATION OF BENCH BLAST DESIGN PARAMETERS …
"K" taken is 1.5 for limestone, "η'" is ratio of length of least resistance line of first row of blast holes to face height, usually equal to 0.55 - 0.70., " ἣ "is ratio of distance between rows of blast holes to length of line of least resistance, usually equal to 0.75 - 0.85., "R d" is digging radius of power shovel, m and "R
