Ann: SXG Proposed Merger with Mawson Gold and Dual Listing, page-87

A gold deposit with 50 plus hits of 100 gram metres to over 4000 gram metres will always get mined

Oceans and asteroids also have large amount of unmined gold that will never get mined.
I think the key here is ''mined commercially''.

If SXG were so sure of its mineability they would be asking for a mining licence don't you think - even if they do plan on selling it on down the track