The biggest attraction at the Rock, Fossil, and Dinosaur Shop is our old-fashioned mining sluice. This popular attraction in Massachusetts is a huge draw for treasure hunters from all over. With a bag of mining rough, identification chart, and screen box in hand, it's time to find a space at the mining sluice. Water from the sluice is used to wash the mining rough away and reveal your gems and fossils. Panning for gemstones is similar to panning for gold, but easier. Just pour a small amount of the mining rough into your screen box and then lower it into the water. As the rough washes away, your gems appear!