Ann: First Mixed Rare Earth Carbonate (MREC) Produced at Caldeira, page-26

Hello. I was personally unable to reconcile the MEI JORC at the MEI average thickness was 6.9 metres and the average density of 1.30 g/cm³ (bulk density). But when i added up all the drill results i got an average thickness of 9.9 metres and using this 9.9 thickness and a bulk density of 1.5 i got close to the MEI JORC.

Therefore, to answer your question, i used the formula metres long x wide x thick (deep) x 1.5.

The 3mt rectangle is 400m x 200m x 20m x 1.5 = 2.4 million tonnes then rounding it up to 3Mt due to the red mineralisation outside of the yellow square near it.