I think the Cu is adding more to the AuEq than the Ag is.
0.5g/t gold, 1.95 silver, 0.17 Cu = 0.79g/t AuEq (1.95 silver, 0.17 Cu added 0.29 to AuEq) (high Cu, low Ag = higher AuEq)
0.49g/t gold, 4.88 silver, 0.09 Cu = 0.67g/t AuEq (4.88 silver, 0.09 Cu added 0.18 to AuEq) (low Cu, high Ag = lower AuEq)
Or calculated it:
Gold is $2156/oz
Silver is $25.18/oz
1:86 ratio
divide 1.95g/t Ag by 86, and it added 0.02g/t AuEq.
Cu = $0.26 per oz.
1:8292 ratio.
Change 0.17% to gpt = 1,700gpt.
divide 1700gpt Cu by 8292 = 0.205g/t AuEq
Check:
0.5g/t Au, 0.02g/t Ag AuEq, 0.205g/t Cu AuEq = 0.725g/t AuEq. Quite close to the 0.79g/t that they calculated (using old prices, quite likely).
So Ag added 0.02g/t. Not much.
But 0.02g/t could be a fine improvement for Korbel. (Hopefully it falls within the same arsenopyrite veins that are easily X-ray sorted out, or being heap leachable).
Have to wait and see though. I haven't tried to guess how much Ag is there. I mainly remember assays showing it in surface samples at Trumpet.
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