A ore with a work index of 12.5 kWhr/t is ground in a lab ball mill for 10 minutes using a
20,125 gram charge of half-inch stainless steel balls. The 80 % passing size of the ore was
initially 4 mm while the 80 % passing size after grinding was 93 microns. A second sample of
a similar ore was subjected to the identical procedure. The sample had an 80 % passing size of
3 mm and the product showed an 80 % passing size of 107 microns. What is the work index
of this second ore sample?
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