Details of Sinclair Zone Project, page-7

Please check my maths, but $10mm / 10500 tons of ore is USD 952 per ton (net) or ~ USD 5600 per ton of refined Caesium.
Does anybody think this seems a bit light? One of the rarest useful and in demand commodities you can find, and we would sell it for less than Copper.
I know the numbers quoted are after after mining costs, but it is a relatively shallow hole going into a high grade homogenous deposit. How much can that cost?
I might be wrong, but something doesn’t quite add up for me.