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Journal of Mining Sciences

2016 year, number 6

Determination of Open Pit Diamond Mine Limits with Regard to Stripping Time Difference

V. L. YAKOVLEV1, I. V. ZYRYANOV2, A. N. AKISHEV2, G. G. SAKANTSEV1
1Institute of Mining, Ural Branch, Russian Academy of Sciences, ul. Mamina-Sibiryaka 58, Ekaterinburg, 620075 Russia
2Yakutniproalmaz Institute, ALROSA, ul. Lenina 39, Mirny, 678174 Republic of Sakha (Yakutia), Russia
Keywords: границы карьера, граничный коэффициент вскрыши, коэффициент дисконтирования, высота зоны вскрышных работ, скорость их понижения, угол наклона рабочих бортов, open pit mine limits, utlimate stripping ratio, discountiing coefficient, stripping zone height, stripping rate decrease, highwall slope

Abstract

The analysis of methods to account for stripping time difference at the stage of determination of limits in deep open pit mining reveals advantages and shortcomings of the methods and provides a principled approach to determination of a discount ultimate stripping ratio for the most representative geological and geotechnical conditions of diamond-bearing ore bodies in the form of single pipes. Discounting of ultimate stripping ratios is based on adding the common formula with an average mean discount coefficient represented by a correlation of mining rate decrease, stripping zone height and highwall slope angle. It is shown that target variation of the factors included in the discount ultimate stripping ratio allows considerable influence on depth and efficiency of open pit mining.