Sift for diamonds (quartz crystals) that are close to 500 million years old at the above-ground Herkimer Diamond Mines. Another experience offered is sluice mining, where you’re provided with a fossil, gemstone, Herkimer Diamond dirt, or “Megamine” bag to sift through, guaranteed to contain treasures. Create sparkly jewelry with your haul in the gift shop. Visitors can camp on their grounds, dine at three restaurants, and keep anything they find in the mines. Accommodation options at the KOA Resort include a tree house and an astronomy cabin with a high-powered telescope.