Relationship between pit slope design and coal reserve estimation in Pit X, Muara Enim, South Sumatra Province

Taufiq Muhammad Wijayanto,Wahyu Wilopo,I Gede Budi Indrawan,Sunarko Sunarko,E Haryono,B White,D Rahmawati Hizbaron,A Cardenas Tristan,R Fitria Putri,F Lavigne,R Che Omar

doi:10.1051/e3sconf/202020002021

Abstract

Mine planning is an important part of mining activity. Improper mine plan will increase production costs, non-optimal extraction of mines and safety factors that do not meet the standard. One of the most important aspects before undertaking mine plan is determining the optimal slope design as a basis for making mine pits for coal extraction. This study aims to estimate the maximum reserves that can be taken from the mine pit by taking account of the safety factor of the pit slope design. The study was conducted using drill log data and rock engineering characteristics. Analysis of slope stability is done using the Rocscience Slide V.6 software while coal reserves estimation is done using Minescape V.5.2. Slope stability analysis is modeled with several scenarios of slope angles until a single optimal slope angle is obtained, with the value of the slope safety factor that meets the safety criteria. The results showed that the maximum single slope angle in a safe pit was 52° with a safety factor of 1.266, while the coal reserves obtained with the said slope angle are 29, 965, 008 tons.

Highlights

1.1 BackgroundIndonesia is one of the countries that has considerable coal reserves of 37 billion tons [1]
Along with the decreasing of oil and gas energy, coal is one of the alternative energy sources that are very potential to be developed in Indonesia
Bukit Asam is capable of producing 28.5 million tons of coal, and in 2020 the production target is increased to 30 million tons

Summary

Introduction

1.1 BackgroundIndonesia is one of the countries that has considerable coal reserves of 37 billion tons [1]. Along with the decreasing of oil and gas energy, coal is one of the alternative energy sources that are very potential to be developed in Indonesia. This condition causes many business people to build coal mining companies [2]. Bukit Asam is capable of producing 28.5 million tons of coal, and in 2020 the production target is increased to 30 million tons. The stability of the slope at the mine pit is closely related to the ground movement. Soil movement is a variety of processes that produce downward and outward movements of slope-forming materials, including rocks, soil, pile materials, or a combination of all these materials [3]. Landslide generally occurs if the slope is not able to withstand the weight of the topsoil because of an additional load on the surface of the slope and the reduction of binding capacity between the relief soil grains

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Conclusion