from open pit to underground

  • (PDF) Transition from open-pit to underground as a new

    First, both open-pit and underground block models must be separately generated. Then, it is necessary to establish a long range mining plan for the deposit. Thus a new terminology, so-called "level-cut", is introduced which assigns both open-pit and underground minable blocks in each level. The open-pit minable blocks in each level (open-pit

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  • Planning Considerations For Transition From Open Pit To

    Transition from open pit to underground mining often risks mud rushes (if mud forming minerals are present), and from sumps and surface dams. Air blasts can result from underground collapses or mud rushes. The presence of an abandoned pit above can lead to greater risks of dilution and mud rushes. The choice of underground mining method affects the surface; and stability requirements may

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  • TRANSITION FROM OPEN-PIT TO UNDERGROUND AS A NEW

    open-pit to underground mining a software on the basis of a heuristic algorithm was prepared by Visser and Ding in 2007 [25]. In the same year Bakhtavar and Shahriar introduced a simple heuristic

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  • Open Pit To Underground Transition SRK Consulting

    Open Pit To Underground Transition; SRK carried out a scoping study on an existing open pit operation (12 Mtpa) that is soon to be reaching a depth where the mine will need to transition to a large-scale underground mining method. The goal was to provide production continuity at a rate that will still be suitable to maximise use of the existing surface processing facilities. The ore body dips

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  • (PDF) Transition from open-pit to underground as a new

    CONCLUSIONSDue to the importance of optimizing transition from open-pit to underground mining as a new challenge in mining engineering, a model based on block economic values of open-pit and underground methods together with NPVs achieved by their mining is initially presented. In order to analyze the model in detail, a hypothetical example is used. During the example the assumptions

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  • Open Pit To Underground Transition Cave Mining Forum

    SRK carried out a scoping study on an existing open pit operation (12 Mtpa) that is soon to be reaching a depth where the mine will need to transition to a large-scale underground mining method. The goal was to provide production continuity at a rate that will still be suitable to maximise use of the existing surface processing facilities. The ore body dips below the bottom of the planned open pit and is still open at

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  • Planning Considerations For Transition From Open Pit

    Transition from open pit to underground mining often risks mud rushes (if mud forming minerals are present), and from sumps and surface dams. Air blasts can result from underground collapses or mud rushes. The presence of an abandoned pit above can lead to greater risks of dilution and mud rushes.

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  • Open Pit To Underground Transition SRK Consulting

    SRK carried out a scoping study on an existing open pit operation (12 Mtpa) that is soon to be reaching a depth where the mine will need to transition to a large-scale underground mining method. The goal was to provide production continuity at a rate that will still be suitable to maximise use of the existing surface processing facilities. The ore body dips below the bottom of the planned open pit and is still open at

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  • An approach towards ascertaining open-pit to underground

    As a rule, Open-Pit (OP) method is considered to be more approvable and dominant than Underground (Ug), especially in recovery, production capacity and mechanization, grade control and cut off grade, ore lose and dilution, flexibility, safety, and so on (Bakhtavar & Shahriar, 2007). Even though, Ug mining is more acceptable from environmental (for

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  • An approach towards ascertaining open-pit to

    Chadwick, J., (2008), Open pit or underground (Going underground, or not), International Mining Magazine, January, pp. 48-50. Bakhtavar, E., Shahriar, K., & Oraee, K., (2008), A Model for Determining Optimal Transition Depth over from Open-pit to Underground Mining, Proceeding of 5th International Conference on Mass Mining (9-11 June 2008), ISBN: 978-91-633-2331-7, Luleå, Sweden, pp. 393-400. Flores, G., (2004), Geotechnical challenges of the transition from open pit to underground

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  • The future is underground from open-pit to

    Keith Marshall, Global Practice Leader of Underground Mining for Rio Tinto, discusses the opportunities but also the risks associated with the inevitable transition from open-pit to underground mining.

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  • THE TRANSITION FROM OPEN PIT TO UNDERGROUND MINING:

    International Symposium on Stability of Rock Slopes in Open Pit Mining and Civil Engineering R. K. Brummer, H. Li & A. Moss Page 411 THE TRANSITION FROM OPEN PIT TO UNDERGROUND MINING: AN UNUSUAL SLOPE FAILURE MECHANISM AT PALABORA Richard K. Brummer*, Hao Li* & Allan Moss♦ *Itasca Consulting Canada Inc., ♦Rio Tinto Limited ABSTRACT

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  • An Approach Towards Ascertaining Open-Pit to

    Open pit or underground (Going underground, or not). International Mining Magazine, January, pp: 48-50. 3: Bakhtavar, E., K. Shahriar and K. Oraee, 2008. A model for determining optimal transition depth over from open-pit to underground mining. Proceedings of the 5th International Conference on Mass Mining, June 9-11, 2008, Lulea, Sweden, pp: 393-400. 4: Flores, G., 2004. Geotechnical

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  • Opencast to underground iron ore mining method SpringerLink

    28/07/2018· At the end of the open-pit mining process in large metal mines, the mining model must change from open-pit mining to underground mining, but the mutual interference between the two mining models leads to poor production safety conditions and difficulties in production convergence during the transition period. To solve these technical problems of poor production safety conditions and

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