This is old news. A sample from most Cornish mines when subjected to modern, super sensitive analytic equipment, will more than likely produce a gold spike somewhere.
Platinum showed up in a sample dredged from the coast off Hayle! (Though from a million tonnes I doubt you would find enough to plate a microswitch contact.)
There are places with values far exceeding Crofty's that are deemed unviable, so I doubt Crofty's results will have the shareholders drooling and gibbering with gold fever.
If they wanted to have a go at gold mining, then Hopes Nose in Devon is the place to exploit; you can actually see that stuff.
"You Chinese think of everything!"
"But I''m not Chinese!"
"Then you must have forgotten something!"