Resource calculation

Has anyone done a rough calculation of potential resource size after 40,000m of drilling??

From my back of the envelope calculation, I found that there is no way to get a 400-500mt JORC as Klaus claimed possible.

My calcs below-
Width: Say 200m wide with 50m spacing requires 5 holes across.
Depth: Say 200m thick lithium with 50m of junk. So each hole to be 250m downhole. Very optimistic but bear with me. So each cross section of width will require 1250m of drilling.
Length: 40,000/1250 equals 32 rows. So we have 31 x 50 m spacing for 1550m strike length.

Total: 200 x 200 x 1550 x 2 (density factor?) = 124mt measured.

If anyone can shed more light on the situation that would be great because I can’t see how 1.2bt let alone 400-500mt is going to be achieved anytime soon unless they are targeting a inferred or indicated status.