Once this high grade vein is mapped 3D is there the equivalent of a road underground tunnel boring machine that can go straight down accurately and guided then bring the ore to surface?
If so, then take the high grade ore core, fill the hole up with the low grade ore, top off with soil and replant... wella... process the high grade ore and bank the dough.
Bit like you know, stents up arteries and catheters.
I found this but eh, I'm JoeBlow not mining engineer.
Ann: Fresh Bonanza Grades at Juruena, page-85
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