Oooh, that is lucky! :) And I'm sure the kiddies would love it there!
I think we originally went to search for gold ;) but I don't recall actually looking... my main memories of that place were me trying to coax the friendly wild birds into the cabin, learning what fool's gold was, and being too scared to climb into part of a cave because I was a chubby child and was certain I would get stuck.
That's more than what I remember of Jenolan Caves! The one memory of that visit was a bird pooping on my head in the carpark, haha!