The article presents technical solutions for the opening and development of sites of the placer deposits with upper «hanging blocks» in the conditions of the «Obryv-Razvalisty-Promezhutochnyj» placer deposit. According to the experience of the opening workings in placer deposits of the North-East of the Russian Federation, a scheme has been adopted for opening mine fields by inclined conveyor and scraper inclines using access drifts. The choice of the most rational scheme of mine field preparation in the conditions of the «Obryv-Razvalisty-Promezhutochnyj» deposit is based on many years of experience in underground mining of placer deposits in the North-East of the Russian Federation. According to the results of the analysis, a chamber-longwall method was selected. The peculiarity of the field, the presence of “upper hanging blocks” and lower blocks on the placer rock bed, determines the interposition and parameters of stopes and inter-chamber pillar.

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The article presents the development of measures to ensure the required thermal condition and recommendations for support setting of underground mine workings in the conditions of the cryolithozone, ensuring the stability of the workings and safe living conditions in the galleries of the tourist complex “The Kingdom of permafrost” (TKoP), located on the 5th km of the Vilyuysky tract in Yakutsk. The following research methods were used: field observation of the temperature condition, visual inspection of the slope and underground mining of the tourist complex, the choice of a rational type of support setting, calculation of the parameters of the support, mathematical modeling and numerical calculations of the temperature condition. The main research results are obtained: the results of field observation of the thermal condition of underground mine workings of the tourist complex “The Kingdom of permafrost” in the winter and spring period of operation, the results of visual inspection of the slope, galleries and chambers, and recommendations for ensuring stability and support setting the existing fallout zones are given. The calculation of the temperature condition of the TKoP and the required capacity of refrigeration machines was performed using the Museum CVM software package developed in the Laboratory of Mining Thermophysics of the IGDS SB RAS. To reduce the energy consumption for the production of artificial cold in the summer, it is recommended to carry out annual autumn and spring cooling charges with artificial ventilation. The recommendations for support setting mine workings have been developed.