not hard to explain what economic grades are...
here is a list of discovery holes of operating mines in the Gawler Craton:
Prominent Hill - 107m @ 1.94% Cu and 0.66 g/t Au
Carrapeteena - 178m @ 1.83% Cu and 0.64 g/t Au
Olympic Dam - 145m @ 2.2% Cu
And here's a slice of BHP's Oak Dam discovery:
Oak Dam - 425m @ 3.04% Cu and 0.54 g/t Au
comparing this EB Deeps:
28m @ 1.21% Cu and 0.38 g/t Au
not very economical/exciting, is it?
Ann: High-Grade Assays Confirm Bornite Zone at Emmie Bluff Deeps, page-44
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