transition from open pit to underground mining at

TRANSITION FROM OPEN PIT TO UNDERGROUND …

A large-scale transition from open pit to underground mining like this one presents three main challenges: (1) to include the geotechnical aspects relevant for mine design and mine planning, (2) to define the proper surface and underground infrastructure, and (3) to fulfil the project deadlines and to achieve the production targets.Transition from open-pit to underground in the case of ...2013-11-1 · Geological and economic modeling of an ore body and also optimization of the depth at which transition is made from open-pit to underground mining is an important part of the mining design process in large and massive deposits. In this paper, a geological block model of Chah-Gaz iron ore deposit located in Iran was first created based on iron ore cut-off grade.

Considerations for open pit to underground transition ...

determine the optimal economic point to transition from open pit mining to underground mining. Several papers have been presented on determining a suitable crown pillar to eliminate or minimise the interaction between open pit and underground mining. Several authors (e.g. Brummer et al. 2006) have presented onTransition from open-pit to underground as a new ...2009-12-9 · In this manner, the most sensitive problem is the determination of the optimal transition depth from open-pit to underground or vice versa. To calculate this depth, a model based on block economic values of open-pit and underground methods together with the Net Present Value (NPV) attained through mining is first presented.

Optimizing the Open Pit-to-Underground Mining …

2016-7-11 · Optimizing the Open Pit-to-Underground Mining Transition Barry Kinga, Marcos Goycooleab, A. Newmanc, aColorado School of Mines, Operations Research with Engineering (ORwE) PhD Program, Golden, Colorado, 80401, USA bUniversidad Adolfo Ibanez,˜ School of Business, Penalol˜ en,´ Santiago, 7941169, Chile cColorado School of Mines, Mechanical …Mining Options Optimization: Open Pit to Underground2015-9-10 · mining generates a better return on investment than open pit mining.The results also show that in the concurrent open pit and underground mining scenario, the optimizer prefers extracting blocks using open pit mining. This is due to the fact that although the underground mine could access ore

THE TRANSITION FROM OPEN PIT TO UNDERGROUND …

2006-3-22 · 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 At the Palabora Mine, the transition to caving 400 m below the bottom of the 800 m deep pit(PDF) Transition from Open-Pit to Underground as a New ...Transition from Open-Pit to Underground as a New Optimization Challenge in Mining Engineering. September 2009. Journal of Mining Science 45 (5):485 …

Transition from Open-Pit to Open-Pit to Underground as …

485 journal of mining science, vol. 45, no. 5, 2009 transition from open-pit to underground as a new optimization challenge in mining engineering(PDF) Transition from open-pit to underground as a new ... · The present mine plan is for open-pit operations and is to cease operating in 2013 at a depth of 1100m and the remained deposit must be economically exploited by block caving [4, 5]. Grasberg copper-gold mine in Indonesia is known as a combined mine of open-pit and underground. Mining by open-pit method will finish by 2015 [6, 7].

v116n8a13 Where to make the transition from open-pit …

2016-9-28 · 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 eventually come to a ''transition point'' where the decision needs to be taken whether to extend the pit or switch to UG mining.Transition of the Ernest Henry Mine from Open Pit to an ...2014-3-24 · 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 firing of an inclined crown pillar between the initial SLC void and the pit followed by a combination of transverse and longitudinal SLC mining.The inclined ...

Transition from open pit to underground – using Mixed ...

2017-1-30 · Transition from open-pit to underground – using Mixed Integer Programming considering grade uncertainty J UNG1* 2, E. TOPAL and O.ERTEN3 1,2,3Department of Mining Engineering and Metallurgical Engineering –Western Australia School of Mines, Australia, joyce [email protected] *presenting author Abstractv116n8a13 Where to make the transition from open-pit …2016-9-28 · 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 eventually come to a ''transition point'' where the decision needs to be taken whether to extend the pit or switch to UG mining.

Rational design of ore discharge bottom in transition from ...

2013-6-8 · Simultaneous extraction of ore reserves from open pitwall and the layer immediately adjacent to the open pit bottom results in higher volume of ore discharge in the limited bottom area, besides the bottom must be stable within the adjacent layer extraction interval. The authors select the pit bottom design with two-way alternate arrangement of loading entries, taking into …Differences between underground mining and open pit …2022-2-10 · The Witwatersrand gold mine in South Africa is an excellent example of underground mining that exploits gold from ancient rocks at depths of up to 4 km underground. What is open pit mining. On the other hand, open-pit mining is the …

Optimizing the open pit-to-underground mining transition

Downloadable (with restrictions)! A large number of metal deposits are initially extracted via surface methods, but then transition underground without necessarily ceasing to operate above ground. Currently, most mine operators schedule the open pit and underground operations independently and then merge the two, creating a myopic solution. We present a methodology …Optimizing the Extraction Strategy for Open Pit and ...2018-9-4 · transition into an underground mine or sequentially exploited with an underground mine followed by an open pit mine, or simultaneously exploited with both open pit and underground mining options. In the case where there is the need to exploit the deposit by both open pit and underground mining methods, the location of a required crown pillar is ...

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.How to transition open-cast mines to underground …2020-10-2 · The mine is in the process of transitioning from open pit to underground, to extend its life by some 25 years. As EPCM contractor for South Africa''s largest mining execution project, Worley is utilising 3D designs for the …

Mining method selection and transition depth …

2021-5-5 · Mining method selection ;transition depth open-pit underground combined mining. 1. Introduction . Naturally, ore bodies come in every imaginable geometric shape. While surface hard rock mines apply the open-pit method to almost any ore configuration, a large number of underground mining methods have been developed primarily in response to theDifferences between underground mining and open pit …2022-2-10 · The Witwatersrand gold mine in South Africa is an excellent example of underground mining that exploits gold from ancient rocks at depths of up to 4 km underground. What is open pit mining. On the other hand, open-pit mining is the most common mining and ranges from very low-priced minerals to finely disseminated gold deposits.

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.A model for determining optimal transition depth over …2016-9-19 · 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

Transition from open-pit to underground as a new ...

2009-12-9 · In this manner, the most sensitive problem is the determination of the optimal transition depth from open-pit to underground or vice versa. To calculate this depth, a model based on block economic values of open-pit and underground methods together with the Net Present Value (NPV) attained through mining is first presented nsiderations for open pit to underground transition .. termine the optimal economic point to transition from open pit mining to underground mining. Several papers have been presented on determining a suitable crown pillar to eliminate or minimise the interaction between open pit and underground mining. Several authors (e.g. Brummer et al. 2006) have presented on

TRANSITION FROM OPEN PIT TO UNDERGROUND …

A large-scale transition from open pit to underground mining like this one presents three main challenges: (1) to include the geotechnical aspects relevant for mine design and mine planning, (2) to define the proper surface and underground infrastructure, and (3) to fulfil the project deadlines and to achieve the production targets termination 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.

[PDF] Mining method selection and transition depth ...

During this paper, in order to identify the priority of consideration between the problems of "mining method selection" and "determining transition depth from open-pit to underground mining" an accurate procedure is introduced step by step. First, it is essential to specify if an ore deposit that potentially will have mined by a combined method of open-pit and underground mining.Water inrush characteristics and hazard effects during the ...During the transition from open-pit to underground mining in iron ore mines, water inrush is a prominent problem for mine safety and production. In this paper, a comprehensive method that incorporates hydrochemical analysis and numerical simulation is proposed to analyse the characteristics of water …

Transition from open-pit to underground in the case of ...

2013-11-1 · Geological and economic modeling of an ore body and also optimization of the depth at which transition is made from open-pit to underground mining is an important part of the mining design process in large and massive deposits. In this paper, a geological block model of Chah-Gaz iron ore deposit located in Iran was first created based on iron ore cut-off grade.Optimization of the transition from open-pit to ...2013-1-21 · from open-pit and underground mining, (0-1) integer programming has been used. In this method, block economic values of open-pit and underground methods should be imported to the transition model. A hypothetical example is presented in order to assess the model in detail. Keywords open-pit, underground, transition depth, optimization, (0-1) integer

Study of the Effect of Mining with Transition from Open ...

As this mining area has a shallow coal seam and a dump, therefore, the mining for the deep resources uses the method of transition from open-pit to underground without protective coal column. In this paper, the numerical simulation method is used to analysis the surface subsidence and slope stability from the two different mining schemes which are from inside to outside, and …Rational design of ore discharge bottom in transition from ...2013-6-8 · Simultaneous extraction of ore reserves from open pitwall and the layer immediately adjacent to the open pit bottom results in higher volume of ore discharge in the limited bottom area, besides the bottom must be stable within the adjacent layer extraction interval. The authors select the pit bottom design with two-way alternate arrangement of loading entries, taking into …

TRANSITION FROM OPEN PIT TO UNDERGROUND …

2006-3-22 · A large-scale transition from open pit to underground mining at Chuquicamata presents three main challenges: (1) to include the geotechnical aspects relevant for mine design and mine planning, (2) to define the proper surface and underground infrastructure, andTransition from Open Pit to Underground Mine2022-1-25 · 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 ...

Mining Sites: The Transition from Open-Pit to …

2014-5-7 · Geological and economic modeling of an ore body and also optimization of the depth at which transition is made from open-pit to underground mining is an important part of the mining design process in large and massive deposits. In this paper, a geological block model of Chah-Gaz iron ore deposit located in Iran was first created based on iron ore cut-off grade. Then …Considerations for open pit to underground transition .. ummer, R, Li, H & Moss, A 2006, ''The transition from open pit to underground mining: An unusual slope failure mechanism at Palabora'', Proceedings of International Symposium on Stability of Rock Slopes in Open Pit Mining and Civil Engineering Situations, The Southern African Institute of Mining and Metallurgy, Johannesburg, pp. 411–420.

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

(PDF) Transition from Open-Pit to Underground as a New TRANSITION FROM OPEN PIT TO UNDERGROUND …2006-3-22 · A large-scale transition from open pit to underground mining at Chuquicamata presents three main challenges: (1) to include the geotechnical aspects relevant for mine design and mine planning, (2) to define the proper surface and underground infrastructure, and

Smooth transition from underground to open pit mining …

2016-4-29 · BHP Billiton Cannington mine is a multi-commodity operation 200 km southeast of Mt Isa in northwest Queensland. Cannington, the world''s largest single producer of silver and lead, uses Maptek Vulcan™ for mine planning and is applying it to the expansion project. Smooth transition from underground to open pit miningOptimizing the open pit-to-underground mining transitionDownloadable (with restrictions)! A large number of metal deposits are initially extracted via surface methods, but then transition underground without necessarily ceasing to operate above ground. Currently, most mine operators schedule the open pit and underground operations independently and then merge the two, creating a myopic solution. We present a methodology …

Optimizing the Extraction Strategy for Open Pit and ...

2018-9-4 · transition into an underground mine or sequentially exploited with an underground mine followed by an open pit mine, or simultaneously exploited with both open pit and underground mining options. In the case where there is the need to exploit the deposit by both open pit and underground mining methods, the location of a required crown pillar is ...Transition from open-pit to underground - Using Integer ...T1 - Transition from open-pit to underground - Using Integer Programming considering grade uncertainty. AU - Chung, J. AU - Topal, E. AU - Erten, O. PY - 2015. Y1 - 2015. N2 - The determination of transition point from open-pit (OP) to underground (UG) is one of the most challenging mining engineering problems.

Strategic mine planning optimization for the potential ...

2019-12-17 · Strategic mine planning optimization for the potential transition from open-pit to underground mining at Akyem gold mine, Ghana Title: Strategic mine planning optimization for the potential transition from open-pit to underground mining at Akyem gold mine, GhanaDetermination 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.

Optimization of the transition from open-pit to ...

2013-1-21 · from open-pit and underground mining, (0-1) integer programming has been used. In this method, block economic values of open-pit and underground methods should be imported to the transition model. A hypothetical example is presented in order to assess the model in detail. Keywords open-pit, underground, transition depth, optimization, (0-1) integerTransition from open pit to underground – using Mixed ...2017-1-30 · Transition from open-pit to underground – using Mixed Integer Programming considering grade uncertainty J UNG1* 2, E. TOPAL and O.ERTEN3 1,2,3Department of Mining Engineering and Metallurgical Engineering –Western Australia School of Mines, Australia, joyce [email protected] *presenting author Abstract