Iron makes up 5 percent of Earth’s crust and is second in abundance to aluminum among the metals
https://www.britannica.com/science/iron-chemical-element
At 6% the cut off is just above the average background percentage in the whole of the earths crust, if they were to change that cutoff the 5% then they could classify the whole of their tenement as an inferred resource, they could mine that for hundreds of years.
I need to see something more compelling than this ?
Ann: Mineral Resource Upgrade, page-24
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