MINIMIZATION OF VOLUMES OF PROCESSING OF GOLD-BEARING SAND OF PLACER DEPOSITS OF YAKUTIA BY LIMIT SIZE CRITERION OF SUB-STANDARD RAW MATERIALS
The analysis of granulometric characteristics of sand and metal of group of loose fields of Yakutia is carried out. A considerable variety of classes of a size is revealed. The integrated scale of a size on the basis of V.A. Grossgeym’s classification, classification of VNII-1 and a method of graphic redistribution of a size of fractions is developed. The generalized charts of distribution of sand on classes are constructed. Unevenness of granulometric compositions of sand on areas of gold mining takes place. Fields with essential differences of a granulometriya of sand are allocated. Possibility of reduction of the minimum size of dump fraction with 50 to 30 mm is proved. The assessment of alleged reduction of volume of enriched sand is carried out. Experience of processing of goldbearing sand on a limit size of elimination of substandard fraction is stated. Accumulative curves of granulometric composition of sand are constructed at boundary values of a size of sorting. Boundary values of classes of a size are accepted according to characteristics of the applied concentrating equipment. It is shown that restriction of the maximum size of enriched sand provides optimum conditions of enrichment.