"A dump truck load at Rocklands is typically ~87 tonnes of ore...if one were to load a truck with nothing but waste (ie. no copper content at all) and then add a single 4 tonne masse (sic) of chalcocite, the entire 87 tonne load would average ~3.8% Cu."
No, it wouldn't. If the company is going to get all folksey with the maths, they should at least get it right.
Maybe there's special Rocklands chalcocite that has more copper than common chalcocite that the rest of the world knows?
"A dump truck load at Rocklands is typically ~87 tonnes of...
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