There is no reason I can see that this 'gadget' wont work....
Yet again, we have gravity separation... more research from prospectors on specfific gravity could evolve a process that could revolutionise mining!!
Many, out there thoughts have realised inventions that we use today as the norm!
Gravity separation is a great tool when recovering gold from small payloads. This pan concept when refined could be a real winner. Wouldn't mind giving it a spin, "so to speak", when one comes on the market.. The principal seems sound enough..Cheers Wal.