Interesting question re leaching silver Nakhla. Yes it is leachable but only by a cyanide solution as far as I remember, so that would be out the window.
Most of the sedimentary KCB copper deposits on CBE SFR MMG appear to be accompanied by lower grade (but economically helpful) silver kickers. For example, SFR's A4 resource has 6.6Moz ofcontained silver (@ c AUD 43 per oz). Nice!
Ngami does have silver but I can't see it being mined economically if the ISCR method is used.
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