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Transition of the Ernest Henry Mine from Open Pit to an ...

The transition from open pit to a producing underground mine involved a complex extraction sequence for the first two production sublevels on RL1650 and RL1625. Underground mining during cave initiation was further complicated when south wall instability prevented completion of the final open pit shell. The transition mining phase included mass ...

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(PDF) Optimization of the transition from open-pit to ...

Transition from open-pit to η Counter for rows considered for setting the crown pillar underground as a new optimization challenge in mining engineering, between open-pit and underground stope mining Journal of Mining Science, vol. 45, no. 5. pp. 87-96.

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Open Pit to Underground Transition - Minxcon Group

the underground mine is typically an extension of the pit. As open pit mining deepens the stripping ratio typically increases, increasing the overall mining costs. As a result companies often strategically transition between surface and underground to maximise .

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Use of an artificial crown pillar in transition from open ...

In the transition from open pit to underground mining, a crown pillar is usually left at the open pit bottom. Crown pillars are often not recovered and as a result they are deemed as permanent losses. To address this problem, this paper discusses use of an artificial crown pillar as replacement for the natural crown pillar during a transition ...

    Author: Shuai Xu, Fidelis T. Suorineni, Long An, Yuan Hui Li, Chang Yu JinGet Price

CONCEPTUAL STUDY OF OPEN PIT TRANSITION DEPTH ...

The transition depth when correctly defined can significantly improve the discounted net present value of the project. In this dissertation, the transition depth from open pit to underground is determined by an iterative process by optimizing the life of the mine production of both the open pit .

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Determining the open pit to underground transition: A ...

transition from open pit to underground mining, including geotechnical interactions, economic considerations and operational challenges. He recognised that the optimal pit design changes if deeper parts of the orebody can be mined by an underground mine and his illustration of the difference is included in Figure 1.

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USING INTEGER PROGRAMMING FOR STRATEGIC .

pit formulation to determine the timing and location at which to transition from open pit to underground mining. We present multiple constraint reformulations that transform non-precedence constraints into precedence constraints to create a desirable math structure for this combined open-pit-to-underground-transition model. Our research allows ...

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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.

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Determination of the Transition Point from Open Pit to ...

Many open pit (OP) mines with considerable vertical extent are approaching the end of their life-of-mine; some of them are seeking the opportunity to make the transition from OP to underground (UG) mining. The decision on the best location for transition from OP to UG mining should be addressed at the strategic mine planning stage.

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Optimising Open Pit to Underground Cut-over: Part Two ...

The only parameters to affect the transition point decision were the cut-off grades of the open pit and the underground. The typical approaches to consider in the open pit to underground transition point optimisation problem can lead to appreciably sub-optimal solutions.

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Transition from Open-Pit to Underground as a New ...

Transition from Open-Pit to Underground as a New Optimization Challenge in Mining Engineering Article (PDF Available) in Journal of Mining Science 45(5):485-494 · September 2009 with 2,182 Reads

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Mining Sites: The Transition from Open-Pit to Underground ...

Jul 10, 2019 · Open-Pit Mining. Open-pit mining can also be identified as open-cast or open cut mining. The practice operates above ground, always at the surface, extracting minerals and rocks from the surface. Open-pit mining presents less dangers in comparison to underground mining - these surface mines do not need to tackle issues such as air loss and cave ...

A model for determining optimal transition depth over .

A model for determining optimal transition depth over from open-pit to underground mining E.Bakhtavar Amirkabir University of Technology, Iran K.Shahriar Amirkabir University of Technology, Iran K.Oraee University of Stirling, UK Abstract In this paper, the authors consider to the deposits which have potential for exploiting initially by Open Pit

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Determining the open pit to underground transition: A ...

transition from open pit to underground mining, including geotechnical interactions, economic considerations and operational challenges. He recognised that the optimal pit design changes if deeper parts of the orebody can be mined by an underground mine and his illustration of the difference is included in Figure 1.

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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.

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Transition from Open Pit to Underground Mine

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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Martin Marietta site adds underground pit : Pit & Quarry

Aug 23, 2016 · Martin Marietta plans to transition its Fort Calhoun Quarry in Fort Calhoun, Nebraska, from an open-pit mining operation to an underground mining operation, the (Blair, Nebraska) Pilot-Tribune & Enterprise reports.. Martin Marietta hopes to begin constructing two tunnels that will run toward the quarry ground to the north side of the current pit by early 2017.

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THE TRANSITION FROM OPEN PIT TO UNDERGROUND .

THE TRANSITION FROM OPEN PIT TO UNDERGROUND MINING: AN ... After completion of the open pit mining, a cave was initiated about 400 m below the pit floor, as shown in Figure 1. Contemporaneous with the cave breakthrough into the pit floor in late 2003 and early 2004, anomalous movements become apparent, and it was clear that portions ...

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Transition from Open Pit to Underground Mine

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.

[PDF]Get Price

Optimizing the Open Pit-to-Underground Mining Transition

open pit methods used in the transition zone. We present a new model and corresponding solution techniques to determine the timing of a transition from open pit to underground mining in both a spatial and a temporal sense. This transition incorporates a crown pillar placement that separates the open pit from the underground mine, and of the ...

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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.

Get Price