The moment you go underground the cost goes up ~ x3.
So Gossan's are synonymous with copper. They are doing, around the world, open cut with 0.5 - 0.7% Cu and undergound with copper equivalent of ~1.5 - 2% Cu (inclusive of gold). If they find a copper deposit grading 5.5% at surface, it's highly profitable (that's the kinda thing that will unleash the animal spirits via the share price)
The moment you go underground the cost goes up ~ x3.So Gossan's...
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