Interesting. Here's the linked article text via Google Translate:
Gold extracted by a metal detector from a pebble dump in the Magadan Region Technogenic placers with large gold Irgiredmet's research shows that technogenic deposits with large gold can be very attractive for mining / 1 and others /. However, almost all such placers are given insufficient attention. In 2002, for the first time, the processing of pebble dumps with large gold using the "metal detector-bulldozer" technology, proposed by us in 1997/2 / was practically realized. The technology is as follows. The metal detector checks the top layer of the soil for the depth, accessible to the existing device (20-30 cm). Identified nuggets are extracted from the sands by penetrating the caves by hand. The used soil layer is removed by a bulldozer. Then a metal detector checks the soil layer on the exposed area for the next 20-30 cm depth. The operation is repeated until the site is recycled to the dam.