Justification of transient process time in transportation system transformation at the bottom of deep open pit mines

The concept of transient processes in development of transportation systems in very deep open pit mines is extremely critical and urgent. The actual depth of proven diamond reserves reaches currently 750–1650 m while the finite target depth of open pit mining is within 750 m. For reaching such depth of open pit mining, the novel process designs as well as mining and transportation equipment are used to optimize open pit design. For instance, the use of articulated or caterpillar dump trucks and steeply pitched haul roads enable decreasing pitwall slope. Steep ramps allow less turns of spiral haul roads on the pitwall, while the narrower dump trucks make it possible to decrease the berm width of the haul road at the bottom of an open pit. As a consequence, the slope angle of the pitwall is increased and the scope of stripping is reduced. Furthermore, for the purpose of deeper level mining, it is possible to arrange ramps in underground openings beyond the limits of an open pit mine. This approach minimizes the influence of haul roads on the pitwall slope and reduces the stripping amount. This article presents an algorithm to calculate the technical and economic performance of the mining technology at the bottom of an open pit mine with accessing the reserves via tunnels, which includes the time of transition to the tunnel accessing and optimizes its depth. The calculations using the proposed algorithm is performed, and the time of transition to the new flowsheet of accessing subject to the depth of an open pit mine and to the depth of an ore body is justified.

Keywords: open pit mining, dump truck, articulated dump truck, hybrid open pit/underground mining, steeply inclined haul roads, tunnel ramp, inclined underground haulage roadways, transition depth, transient process, open pit mine transportation system.
For citation:

Glebov I. A., Zhuravlev A. G. Justification of transient process time in transportation system transformation at the bottom of deep open pit mines. MIAB. Mining Inf. Anal. Bull. 2022;(5):95-107. [In Russ]. DOI: 10.25018/0236_1493_2022_5_0_95.

Acknowledgements:

The study was carried out under State Contract No. 075-00412-22 PR.

Issue number: 5
Year: 2022
Page number: 95-107
ISBN: 0236-1493
UDK: 622.27:622.6
DOI: 10.25018/0236_1493_2022_5_0_95
Article receipt date: 01.11.2021
Date of review receipt: 25.02.2022
Date of the editorial board′s decision on the article′s publishing: 10.04.2022
About authors:

I.A. Glebov1, Junior Researcher, e-mail: i.glebov@igduran.ru, ORCID ID: 0000-0003-4436-3594,
A.G. Zhuravlev1, Cand. Sci. (Eng.), Head of Laboratory, e-mail: juravlev@igduran.ru, ORCID ID: 0000-0001-7643-3994,
1 Institute of Mining, Ural Branch of Russian Academy of Sciences, 620075, Ekaterinburg, Russia.

 

For contacts:

I.A. Glebov, e-mail: i.glebov@igduran.ru.

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