FIELD: mining. SUBSTANCE: primary fill is formed in making dump tier by filling rock mass at angle of natural slope. When filling next portions of rock mass on primary fill, upper slope edge layers of different fractions of dump tier are formed due to segregation of material different lumps. Dump tier is worked by subbenches in descending order with taking layers optimized in lump sizes found in the intervals of certain heights of transfer store with subsequent loading on transportation facilities directed depending on needed size fraction of rock mass. EFFECT: higher efficiency. 3 dwg
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