Yep gravity circuits and upgrades are always a good thing, nearly every Au and base metal mine should have one - even if the Au grades aren't that flash, they always end up being installed/upgraded and for the simplicity and cost of operating are a no brainer in most cases.
Nearly every site I have worked on has one, and one site that the original Metallurgists swore black and blue would never have one - got one pretty much straight away after commissioning with a CIL plant that refused to work properly, and the gravity plant is still going making money for its 4th or 5th owner!
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