Ann: Gold Extraction Results from Ema and Tres Estados, page-219

Have learnt a lot reading the many posts and no doubt the debate will continue, however there is one explanation that answers all the issues.

Call me anything you like , but this is the solution:
BBX has the Philosopher's Stone and using alchemy has transmuted base substances to gold.

This explains
-why its difficult to extract
-why modern science can't explain it
-all those transition elements that appear as part of the transmutation process
-why its visible one moment,invisible the next
-why we're all arguing

and finally why I'll consider putting in a buy order on opening.