The rustic mining settlement of Opalton lies 120 kilometres south west of Winton, and is home to the Queensland Boulder Opal. First discovered in 1888, the boulder opal is unique to Queensland's Tropic of Capricorn, occurring within a belt of weathered Cretaceous sedimentary rocks known as the Winton Formation. A combination of mineral rich water and a slight electrical charge has grown a crystal structure inside the opal that refracts light, creating the stunning appearance of this Tropic treasure. The largest piece of opal on record was uncovered at Opalton, a pipe opal over three metres long. With a fossicking licence you can try your luck 'specking' and 'noodling' for fragments of opal from the surface or spoils of old workings. Licences are available for one to 12 months and can be obtained from the Mining Registrar in Winton and the Opalton Outpost. There are camping facilities and basic cabins. Heading West Visit Winton's Waltzing Matilda Centre for a dose of Australian folklore and the rustic mining settlement of Opalton to search for treasure. Heading East Longreach is home to the Australian Stockman's Hall of Fame and Starlight's Lookout, the jumpup used in the infamous cattle heist.