Gem Mine at Gem World in Franklin, North Carolina lets you and your family become miners for the day. The admission is free and everything you need to go mining for gems is provided. Also, the kids won't be disappointed as gem stones are guaranteed in every bucket. You can buy as many or as few of the gems you find.
A gemologist is on hand to help you identify your treasure, and custom gemstone cutting is available. With a picnic area, restrooms, and concessions, you'll be able to spend the whole day.