The lower the pebble crusher specific energy imparted by the pebble crushers, the coarser the product size and the greater the proportion of crushed pebbles that will again report to the pebble screen oversize. Such recycle introduces unnecessary process inefficiency.

Using the same data and blocks that were used to quantify the impact of crusher specific energy on plant throughput, the impact on the SAG mill pebble production rate can also be determined. By ‘blocking’ the data, the effect of different ore sand different pebble return rates can be accounted for, allowing the effect of changing the pebble crusher plant specific energy to be more accurately quantified. The pebble production ratio used is the ratio of pebble discharge from the SAG mill (pebble screen oversize) to total SAG mill feed rate. The total SAG mill feedrate is the sum of the new feed and pebble recycle rates.

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