Pebble Crushing Circuit Design
WEBAug 11, 2018 · RQD <70 >40 The ore or rock type is considered to be less competent and amenable to semiautogenous grinding without a pebble crusher. RQD <40 The ore or rock type is considered to be incompetent and amenable to semiautogenous grinding provided it is blended with more competent ores or is ground with a substantial ball .