Authors: E.G. Malinovsky, A.I. Golovanov, B.A. Ahpashev

Title of the article: Studies of the influence of the granulometric composition of the broken ore mass on the extraction indicators with a system of forced block caving of ore by physical modeling

Year: 2022, Issue: 3, Pages: 41-53

Branch of knowledge: 25.00.22 Geotechnology (underground, open and construction)s

Index UDK: 61.51:52.45.19

DOI: 10.26730/1999-4125-2022-3-41-53

Abstract: The work is aimed at improving the technology of extracting the reserves of shallow and inclined ore deposits by taking into account the influence of the granulometric composition of ore on the amount of losses and dilution during the release of ore under collapsed rocks. The study of the influence of the granulometric composition of the ore mass was carried out by physical modeling of the sub-level caving of ore with a system of forced block caving. The simulation of the sub-level ore caving was carried out on a scale of 1:100. The shipment of rock mass was simulated by a bucket model of a loading machine. White marble chips were used as an ore classified by size into classes -3; +3 -5; +5 -7; +7 -10 mm. Crushed stone with a size of +7 -10 and +10 mm was used as rock. The ore mass was produced from one and three layers. Physical modeling was carried out for three granulometric compositions of the broken ore mass: the actual, improved without extra dimensions at the size of the conditioned piece of 700 mm and the average for the mine, as well as for four thicknesses of the ore body. To simulate the actual size of the loaded rock mass, the model was divided into parts proportionally to the sections with three characteristic distributions of granulometric composition. The dependences of the change in losses and dilution while the ore mass of various granulometric composition is unloaded have been established, which can be taken into account when designing the technology of mining the reserves with a system of forced sub-level caving and for the increase in the efficiency of mining reserves underground.

Key words: flat and inclined ore deposits physical modeling a system of forced sub-level caving loss and dilution of ore underground mining

Receiving date: 09.05.2022

Approval date: 07.06.2022

Publication date: 07.07.2022

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