Validation of Slopes of Access Roads in Deep Open Pit Mining
G. G. SAKANTSEV1, V. I. CHESKIDOV2, I. V. ZYRYANOV3, A. N. AKISHEV3
1Institute of Mining, Ural Branch, Russian Academy of Sciences, ul. Mamina-Sibiryaka 58, Yekaterinburg, 620075 Russia
2Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
3Yakutniproalmaz Institute, ALROSA, ul. Lenina 39, Mirny, Republic of Sakha (Yakutia), 678174 Russia
Keywords: глубокие карьеры, уклон вскрывающих выработок, дополнительный разнос бортов, переходные процессы, дисконтированные затраты, deep open pit mines, access road slope, extra pit wall expansion, transition processes, discounted cost
Abstract
It is found that the slope of access roads influences expansion of nonmining pit walls in order to arrange these roads. Aiming to determine extra expansion of nonmining pit walls, the quick and accurate analytical method is developed. It is proved that the increase of the slope of access roads to the maximum possible values (20-24%) enables reduction in stripping by 20-40 % in deep open pit mines. The mining efficiency in case of steep slopes, aside from extra expansion of nonmining pit walls, is also influenced by the depth of transition to such slopes and the transportation capacity of the access roads depending on distribution of mining operations along the depth of an open pit mine. It is demonstrated that it is most reasonable to gradually increase the slope of access roads with the mining depth, starting from the initial value (8%) and up to the maximum governed by technical requirements and operating conditions.
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