(FILES) This file photo taken on May 28, 2016 shows the World Champion in Gold Panning Dirk Mehlhorn prospecting gold nuggets from a bucket of sand during the International Championships in Gold Panning in Zlotoryja, Poland on May 28, 2016. Every year, with the arrival of warm weather, gold diggers from around the globe converge on the Kaczawa river in Poland's gold rush capital Zlotoryja to try their luck at panning. / AFP PHOTO / PIOTR HAWALEJ