Ann: Mineral Resource Upgrade, page-335

Of cause the softer the rock the faster it will go through the crushing circuit ..
Your just turning big rocks into little rocks .
Starts with the shot fired , nice tight pattern and hits it hard , loaded straight into a feed bin in the pit were before it drops into a large jaw Crusher the feed bins grizzle Scalps of 150mm and down.
Jaw crusher chomps it down to 200mm .
Conveyor belt to the top of the pit straight over screens to scalp off fines that go to ball mills ,
rest is put through impact crushers and smashed down ..up over a screen deck to scalp off fines for ball mill anything that don't pass through goes back through the impactors ..