You already have all the information that TVN has as far as tonnage is concerned.
They've told you the area, and the target thickness. You've got the actual thickness (much greater than target). You can work out the coal volume, then multiply by the density (about 1.4) to get a tonnage.
I posted the calculation a few weeks back. We're looking at high hundreds of millions, possibly a billion tons in the deposit.
Initial JORC mightn't be that high because it will need a large drilling program to confirm it but you will see a significantly higher JORC than the 50Mt target.
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