At Salt Lake City's Utah Museum of Natural History, appraiser Gary Piattoni introduces ANTIQUES ROADSHOW host Mark Walberg to the world of the rock hound and the market in minerals. At the Salt Palace Convention Center, ROADSHOW appraisers hit a mother lode of precious objects, including a set of clubs once owned by Utah golf legend George "Gix" Von Elm, who won the U.S. Open Amateur in 1926; a set of beautiful 18th-century Chinese white jade carvings; and a pair of rare documents: a Mormon advertisement on textile and a copy of Brigham Young's Invasion Proclamation - both issued in 1857, during hostilities between the Mormons in Utah and the U.S. government - valued at, $10,000 to $15,000.