Numerical modeling of Open Pit (OP) to Underground (UG) transition in
Such a transition is often necessary for both technical and economical reasons, as in some coal basins open pit operations at greater depths occur unfeasible, which calls for a proper selection of ...
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Research into stress-strain state of the mass under open pit …
Purpose. Studying the stress-strain state of the rock mass under the open pit, taking into account the change in the open-pit bottom width in order to reveal the geomechanical state and determine ...
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Planning for an underground transition
Some believe that you should mine the biggest open pit you can. Others take a strict cost analysis approach to determine the depth at which the transition occurs. However, the "optimal" depth of an open pit typically …
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Determining the open pit to underground transition: A new method
In such circumstances, an early transition from open pit to underground mining may prove more profitable. This is the case in many large-scale open pit mines, where considerable amount of mineral ...
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Timing of transition from open-pit to underground mining: …
The transition from open pit (OP) to underground (UG) operation is one of the challenging mining engineering issues. Mines that have the potential to transition from OP mining to UG mining will ...
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Optimization of open pit to underground transition …
This paper proposes a mixed-integer programming model to obtain the optimal transition point and the transition period from open-pit to underground mining, …
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Landsat Image Gallery
The Operational Land Imager (OLI) on Landsat 8 acquired this image of the Palabora mine on July 2, 2019. It is South Africa's largest open-pit mine, measuring almost 2 kilometers wide. It is about half the …
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Numerical Simulation of Crown Pillar Behaviour in Transition from Open
Crown pillars provide regional and local support by isolating the ground surface from underground mine workings. Topography above the underground mine may be a relatively flat ground surface or an open-pit structure. Depending on what lies above and design of the underground mine, the crown pillar behaviour will differ. In transitioning …
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Publications | COSMO
DOI: 10.1080/17480930.2019.1631427. Saliba, Z. and Dimitrakopoulos, R. (2019) An application of simultaneous stochastic optimisation of an open-pit mining complex with tailings management. International Journal of Mining, Reclamation and Environment. DOI: 10.1080/17480930.2019.1688954.
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IGF CASE STUDY
This case study of the Golden Pride open-pit gold mine in Tanzania provides good examples of how closure and post-mining transition can be done effectively and inclusively. It outlines the steps that were taken by the mine, the Government of Tanzania, and local communities to define and implement the closure plan for the operation.
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Semi-symmetrical production scheduling of an orebody
•The transition problem is the case of many large-scale open pit mines in which a considerable amount of mineral reserves remain beneath the pit bottom. •An innovative view toward the long-term production scheduling of block caving mines was introduced and applied to solve the transition problem between Open pit (OP) and block …
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A Review of the Governing Factors in Pit-to-Crack Transitions …
In either case, the pit-to-crack transition relies on the fact that in the presence of a stress (either applied or residual), the pit acts as a stress concentrator. 14,39 Additionally, in both cases, pit characteristics (i.e., morphology, size, etc.) affect the pit-to-crack transition while in the case of an actively corroding pit, pit growth ...
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Modernized Hemlo Transitions to Underground Mining
Hemlo, Ontario – Barrick Gold Corporation (NYSE:GOLD)(TSX:ABX) said today that plans to extend the life of the Hemlo gold mine by transitioning it to a modernized Tier Two 1 asset with a purely underground operation are well underway as open pit mining at the mine starts winding down. The Hemlo open pit has been mined since 1989 and …
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Frontiers | Stability Control of Slopes in Open-Pit Mines and
Introduction. The Fushun western open pit has a 100-years mining history and has now formed a deep and large pit with an east-west length, north-south width, and depth of 6.6 km, 2 km and 400 m, respectively, disturbing over an area of 15 km 2.Since the mining of the western open pit and the development and construction of the city were in …
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Planning for an underground transition
Some believe that you should mine the biggest open pit you can. Others take a strict cost analysis approach to determine the depth at which the transition occurs. However, the 'optimal' depth of an open pit typically lies somewhere between these two limits. There are numerous technical and non-technical factors that need to be considered.
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Sustainability | Free Full-Text | Selection of Open-Pit Mining …
Mining of the extensive, steeply dipping ore deposit takes several decades. An open-pit mining method is more often used in the early years of such a mining enterprise (ME). The management of the enterprise is faced with the problem of changing the mining method as the depth of the quarry increases. Untimely solution of this issue or the choice …
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Open-pit mining | Britannica
Category: Science & Tech. Related Topics: surface mining. break-even stripping ratio. stripping ratio. floating cone technique. pit. open-pit mining, surface mining ( q.v.) to obtain minerals other than coal. This article was …
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TRANSITION FROM OPEN-PIT TO UNDERGROUND AS …
The first method for determining transition depth from open-pit to underground was the "Allowable Stripping Ratio", which is a relation between the exploitation cost of 1 ton of ore in
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(PDF) Extended Ultimate-Pit-Limit Methodology for
The transition from surface mining to underground is a critical issue for metal mines. The commonly cited procedure cored by ultimate-pit-limit (UPL) methodology is restricted to maximize the ...
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Where to make the transition from open-pit to …
The transition from open pit (OP) to underground (UG) operation is one of the challenging mining engineering issues. Mines that have the potential to transition from OP mining to UG mining will ...
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Safety Analysis of Synergetic Operation of Backfilling the Open Pit
The transition from open pit mining to underground mining is essential for mineral resources to achieve deep excavation. Recently, cemented paste backfill (CPB) has been proposed as a novel technology to achieve open pit backfill (OPB). The proposed method not only eliminates the danger of the open-pit slope but also reduces the …
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Selection of Open-Pit Mining and Technical System s …
open pit [6,13]. The transition to a new type of transport can take a long time and involves changing the opening workings' parameters and transport communications [6]. The strategy of transition to a new stage of open-pit mining involves changing the parameters of the open pit at the end of mining. The main parameter that is …
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Optimizing the Open Pit-to-Underground Mining …
Optimizing the Open Pit-to-Underground Mining Transition | Request PDF. DOI: Authors: Barry King. Marcos Goycoolea. Universidad Adolfo Ibáñez. A. Newman. …
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Numerical Simulation of Crown Pillar Behaviour 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.
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Planning Considerations For Transition From Open Pit To …
Planning Considerations: The efficient transition from open pit mining to an underground operation requires extensive planning. For a large mining operation, planning could last …
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Combined optimisation of an open-pit mine outline and the transition …
Before commencing any such transition a project study is conducted in which strategic mine plans are created. The study may take many months or years. An example is the Grasberg copper mine in Indonesia owned by Freeport-McMoRan. Study work on the transition from open-pit to underground commenced some time before 1995 but was not …
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How to Prepare for an Open Pit to Underground …
Begin by establishing the upper and lower limits of the transition. The minimum depth determines the upper limit for mining the ore body using underground methods. The lower limit is determined by the Lerchs …
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Open Pit Transition Depth Determination Through …
This paper provides an iterative method to determine open pit to underground optimum transition depth by incorporating all the …
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Optimizing the open pit-to-underground mining …
This transition incorporates a crown pillar placement that separates the open pit from the underground mine, and of the sill pillars, i.e., levels left in situ that can …
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GPS monitoring and analysis of ground movement and
The transition from open-pit to underground mining is a complicated geomechanical process. In terms of mining sequence, slope rocks are disturbed or affected twice due to the transition of mining. With respect to spatial relationship, part of the two mining-influenced areas will be overlapped with each other; therefore, a composite …
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