Institute of Mining, Far Eastern Branch, Russian Academy of Sciences, Khabarovsk, Russia
V. S. Alekseev, Leading Researcher, Candidate of Engineering Sciences, Alekseev.igd.khv@mail.ru
N. A. Lavrik, Senior Researcher
E. V. Alekseeva, Junior Researcher

Gold placer deposits are not only sources of precious metals, but also often contain other commercial-scale valuable components and can be simultaneously sources of Ti, Sn, W, Zr, TR and others. The analysis of the previous and current research on the complexity of some gold placer deposits in the Russian Far East, in particular, in the Khabarovsk Region, show that products of secondary gravity concentration of schlich samples (primary gravity concentrate) contain: 3–74 % tin, up to 44–48 % WO₃, up to 10 % ilmenite, up to 10 % ZrO₂, up to 1 % Nb₂O₅, up to 600 ppm Ta₂O₅, 0.11–1 % ΣTR₂O₃; up to 0.3 % In, 20–200 ppm Sc, up to 0.2 % Cd and up to 1 % Bi. There are gold placers that contain platinum and silver. This article summarizes the known research findings on the complexity of gold placers in the Khabarovsk Krai with regard to the results of new studies over the past few years. The complexity of gold placers was analyzed during investigation of the material constitution of sampled sands, gravity concentrates and tailings. Then a methodology for estimating reserves of associate minerals and efficient process flowsheets for their recovery was developed for the deposits in the Russian Far East and in the Khabarovsk Krai.
The study was supported by the Russian Science Foundation, Grant No. 24-17-20026, https://rscf.ru/project/24-17-20026/, and by the Ministry of Science and Education of the KhabarovskKrai, Agreement No. 109С/2024).
The mineralogy analysis, electron microscopy and gravity separation of test samples were carried out at the Shared-Use Center for Raw Material Analysis, Khabarovsk Federal Research Center, Far Eastern Branch, Russian Academy of Sciences.

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