The Financing Arrangement, page-35

Contained Zn metal is indicated to be a lot higher in the first few years.

Recovery rates were also indicated in the PFS.

WoodMackenzie is forecasting a new medium-term Zn level of $3747/t ($1.70/lb), so your profit figure may in fact turn out to be US$426,699,910.

It is quite clear that only a small minority think the Zinc rally is here to stay. Perhaps we should suggest Jonathan Downes to hedge 5 years out. Generating this much cash per year for 5 years...not even the doubters can criticise the bank balance.