Guys if lumps of malleable metal are on the bit at end of hole it is likely that overestimation is a problem, because the rotation will shave off soft metal as it pushes down and will contaminate barren ground as well.
If the resource estimate didn't pick this nice extra material up in the costean, it will be because it wasn't sampled, not because the sampled estimate is wrong.
Good luck
more high grade cu found, page-16
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