The distribution of fine-grained and fine gold in gale-effel dredged dumps of the Uderey, Murozhnoye, and Bogorodskaya placers was studied. A comparative assessment of the efel dumps using trenches, pits and wells was carried out. For the treatment of samples, a 7.5 "Nelson concentrator and field refining laboratory were used.
The recommendations are given on the choice of reconnaissance means, optimal volumes of sampling and technology for their enrichment.
