| Annotation |
The research of a silt-clay mineral raw materials sample, selected in August 2019 at inby unit Korzhykha of the Karakumsky mine, has been carried out in laboratory conditions as close to semi-gravity testing.
The analysis of the obtained results has made it possible to determine the content of precious metals in silt-clay mineral raw materials selected from the ash dump of an alluvial technogenic deposit at the Transbaikal region. From the chemical analysis of the initial sample, it follows that the content of gold is 3,5 g/t, and silver is 1,21 g/t.
The estimation of gold extraction into gravity concentrate at different grinding sizes of 80 % of the class 0,212, 0,150, 0,106, 0,075 mm has been made by single-stage gravity enrichment at the Nelson concentrator (grade KC-MD3-G4) with re-cleaning of the concentrate, at the Moseley separator (C-800). High rates of gold recovery have been recorded at a P80 size of 0,075 mm 40,72 %.
The studies have been conducted on the degree of a valuable component recovery in three-stage gravitational washability. The distribution of free gold in the size classes is determined. The dependences of recovery degree of precious metal (Au) from the stage of crushing the raw material are stated, and which is: stage 1 – Р100 – 850 µm, extracting into concentrate 18,27 %; stage 2 – P80 of 212 µm, the recoveries to concentrate of 51,2 %; stage 3 – P80 of 75 µm, extracting into concentrate 66,07 %.
The analysis of works on estimation the efficiency of clay gold-containing sands’ washability by the gravitational method is performed. The production of conditioned gravity concentrates from the dump of a technogenic alluvial deposit of Transbaikal region has been confirmed by laboratory tests
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