Proceedings of the 2nd International Conference on Industrial and Technology and Information Design, ICITID 2021, 30 August 2021, Yogyakarta, Indonesia

Research Article

Evaluation of Differences Needs for Shotcrete Materials at the Haulage Level of Grasberg Block Cave (GBC) Underground Mine PT Freeport Indonesia

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  • @INPROCEEDINGS{10.4108/eai.30-8-2021.2312666,
        author={Friskila Nesya  Gusti Krisdiana and Hidayatullah  Sidiq and Bayurohman Pangacella Putra},
        title={Evaluation of Differences Needs for Shotcrete Materials at the Haulage Level of Grasberg Block Cave (GBC) Underground Mine PT Freeport Indonesia},
        proceedings={Proceedings of the 2nd International Conference on Industrial and Technology and Information Design, ICITID 2021, 30 August 2021, Yogyakarta, Indonesia},
        publisher={EAI},
        proceedings_a={ICITID},
        year={2021},
        month={10},
        keywords={underground mine ground support shotcrete material overspray},
        doi={10.4108/eai.30-8-2021.2312666}
    }
    
  • Friskila Nesya Gusti Krisdiana
    Hidayatullah Sidiq
    Bayurohman Pangacella Putra
    Year: 2021
    Evaluation of Differences Needs for Shotcrete Materials at the Haulage Level of Grasberg Block Cave (GBC) Underground Mine PT Freeport Indonesia
    ICITID
    EAI
    DOI: 10.4108/eai.30-8-2021.2312666
Friskila Nesya Gusti Krisdiana1,*, Hidayatullah Sidiq1, Bayurohman Pangacella Putra1
  • 1: Department of Mining Engineering Faculty of Mineral Technology Yogyakarta National Institute of Technology Yogyakarta, Indonesia
*Contact email: friskilagk@gmail.com

Abstract

To support underground mining activities, good and effective ground support is needed. Shotcrete is one of the ground supports applied in Grasberg Block Cave underground mine of PT. Freeport Indonesia. The research area is on Track 20 Level Haulage GBC PTFI. When spraying shotcrete there is always an increase in the amount of material planned (overspray) which causes a difference in the amount of material needs. The purpose of this research to evaluate the factor that affect difference in the amount of material needs. Quantitative research methods by collecting secondary data from companies. The results of this research shotcrete planning calculated by the dimensions of the tunnel heading, the total material needs is 192.576 m3. The actual results is 272 m3 from actual daily shotcrete data. Then evaluated from the difference in the amount of shotcrete material needs. The factors that cause an overspray is 41% from the total planning material affected by overbreak, over thickness up to 10cm, and rebound of 4.9%. Efforts to reduce the amount of over shotcrete material needs by reducing the overbreak factor, reducing the percentage of material rebound and reducing the size of the over thickness from the minimum standard.