Institute of Problems of Comprehensive Exploration of Subsoils of Russian Academy of Sciences (Moscow, Russia):

Aynbinder I. I., Head of Department, Professor, Doctor of Engineering Sciences
Ovcharenko O. V., Senior Researcher, Candidate of Engineering Sciences, e-mail: geoexpert@yandex.ru

“Severnoe Zoloto” LLC (Magadan, Russia):

Grigorev N. V., Chief Executive Officer
Logunov N. Yu., Deputy Chief Executive Officer

This article gives the results of researches on substantiation of structural parameters of system, technology and order of underground development of complex-structured vein gold-silver deposit Dvoynoe. The main industrial mineralization of this deposit is concentrated in quartz-vein bodies (low sulfide veins and veins of quartz and adular-quartz composition). Length of veins is 50-570 m, their capacity varies from the first tens of centimeters to 5-11 m. Length of veins in upswells is up to 40 m. Bearing strata are metasomatically changed faces of andesites and basaltic andesites, aglomerate and coarse-lapilli tuff of andesites. For the purpose of provision of maximal completeness of extraction of valuable ores of Dvoynoe deposit and limitation of impoverishment of ore mass, there is offered the underground mining of reserves by chamber and layer development systems with goaf stowing. At the same time, there appears the necessity of solving of complex of technological problems (provision of safety of carrying out of stoping in the conditions of risk of forecasting of drain waters in goaf, stability of stayed ore ceiling, roof and edges of excavations and chambers) and carrying out of geomechanical estimation of stress and strain state of structural elements of development system. The estimated geomechanical status of rock massif allowed the recommended ways of development system to explain the following parameters:
- constructive parameters of mining facilities, providing the stability of excavations and safe mining operations (from the point of view of pillar stability, including sufficient minimal capacity of temporal protective ore pillar under open pit, equal to 20 m);
- parameters of chambers and chamber-pillar order of processing of chambers on local site in the time of development of secondary chambers with vertical backward slip from adjoining primary chambers (not more than 60 m).