Hi Jonnyash
Happy to be corrected if I am wrong. The way I understand it is ....
As a pit is deepened a certain amount of waste rock is included in the feed from the periphery. An ore body is surrounded by a halo of lower grade but the boundary is indeterminate. The deeper the pit, the more defined the ore body and the lower the strip ratio..... the less dilution.
Ann: Global lithium producer SQM takes 40% in Pirra Lithium, page-24
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