First Look at "Gem Washing" in the Seven Dwarfs Mine Train Queue

A while back Imagineers revealed that gem washing and sorting would be part of the interactive queue for the Seven Dwarfs Mine Train. I was trying to think of how they would keep quests from stealing said gems. I guess it seems pretty obvious now that the feature will be part of a 15-foot touch screen in a sluice box.

Looks like a good way to spend the hours you'll likely be on line for the coaster. The glowing gems have a nice effect in the indoor queue as well. What do you think?