from open pit to underground

from open pit to underground

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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Open Pit to Underground – The Times are Changing

Jun 23, 2021  Copper mining is starting a significant transition from open pit to underground as pittable reserves become depleted. Figure 1 shows

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Open Pit to Underground - Transition and Interaction

In such cases, surface plants and critical underground facilities such as conveyer tunnels, access ramps, ore passes, hoisting shafts and ventilation shafts are often located much closer to the pit rim and the orebody than is desirable for the deeper mining situation.

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Transition from Open-Pit to Underground as a New

depth from open-pit to undergrou nd or vice versa. To calculate this depth, a m odel based on block economic values of open-pit and underground m ethods

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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.

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THE TRANSITION FROM OPEN PIT TO UNDERGROUND

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 of the north wall were failing.

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Mining Options Optimization: Open Pit to Underground

The NPV generated at a 5% discount rate when the orebody is extracted with i) open pit miningis $2 103 M, ii) underground miningis $822 M and iii) concurrent open pit and underground miningis $2154 M. Comparatively, implementing open pit mining generates a higher NPV thanunderground mining.

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How to transition open-cast mines to underground

Oct 02, 2020  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 project infrastructure to provide 3D models for the entire project’s surface and underground infrastructure. Intelligent mines

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Transition from Open-Pit to Underground as a New

In the study, a method based economical block models of OP and Ug to determine the Optimum Transition Depth (OTD) from Open-Pit (OP) to Underground (Ug) mining was introduced. The main idea was ...

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Open Pit to Underground - Transition and Interaction

Open Pit to Underground - Transition and Interaction. Many ore deposits have considerable vertical extent which is not always known at the time of commencement of mining. In many of these cases, initial mining is by opencast methods, and as ore reserves are proved to greater depths, the pits are often planned to go deeper than had been ...

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Open Pit To Underground Transition - Cave Mining Forum

First Presented: 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 ...

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Optimizing the open pit-to-underground mining transition

Feb 16, 2017  Underground mining is used when an economically viable deposit is situated sufficiently deep such that open pit mining is cost prohibitive. There exist many underground mining techniques: (i) open stoping (), (ii) room-and-pillar, (iii) sublevel caving, (iv) drift-and-fill, (v) longwall, and (vi) block caving.Determining which method(s) to use is typically based on

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Considerations for open pit to underground transition interaction

Brummer, 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.

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Considerations for open pit to underground transition

These will be unique to the sequence of the open pit underground interaction, which can take any combination of the following forms: Scenario 1 – Open pit transitioning to underground; concurrent mining. Scenario 2 – Underground mining below existing open pit. Scenario 3 – Open pit mining through existing underground working.

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Open Pit to Underground - Transition and Interaction (English)

SFX and Citation Linker. Frequently asked questions concerning SFX; Electronic books. The e-book database EBC; Audiovisual media; Research data; Alliance and national licences

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Opencast to underground iron ore mining method - Springer

Jul 28, 2018  Abstract. 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.

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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 inrush during the transition from open-pit to ...

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Study on the Ground Movement in an Open-Pit Mine

Jun 09, 2020  The combined surface and underground mining method is typically used in an open-pit mine for better production and profits. However, the improved scale of mining operations at the combined mining conditions results

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Beyondold - Micromine - Technology for Mining

Micromine Beyond provides flexible, adaptable and comprehensive tools that enable you to streamline design and optimise your mine plan. A specialised toolset to optimise your mine site operation whether open-pit or underground. Powerful and intuitive tools for planning and designing surface and underground mines that support business fundamentals.

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Titan Announces Significant High Grade Drill Extensions to ESM Open Pit

2022 ESM Open Pit - Surface Drilling . ... Additionally, the down dip extensions of this mineralization may provide targeted areas for underground extraction. Overall, the

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A model for determining optimal transition depth over from open-pit

Open Pit (OP), underground (Ug) methods or both of them are selected depending on the geometry properties of the deposit, its position with respect to the surface and so on (Camus, 1992). In a choice between Op and Ug methods, the other most significant factors to be taken into account, are: a) size, shape, and depth of deposit; b) rock ...

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Open Pit Mining - intechopen

Feb 17, 2021  Compared to underground mining methods, the open pit mining method requires removing significant amount of overburden from the pit and moving it outside the mine. The cost of extraction of the ore from open pit constitutes the bulk of the total cost of mining operations, because the access to the ore body is so fast and requires less time ...

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Transition from open-pit to underground as a new optimization

Dec 09, 2009  There are many deposits that have the potential to be mined by a combined method of open-pit and underground. 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

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Vale’s Voisey’s Bay is transitioning from open pit to

The approximate 2-billion-dollar project will secure the future of mining in Voisey’s Bay providing access to two separate underground deposits, Reid Brook and Eastern Deeps. In June 2021, the project hit an important milestone when the

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

Nov 01, 2013  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.

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From open-pit to deep-level - African Mining Online

Nov 01, 2020  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

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Open-pit vs Underground Mining: What’s the

Jul 02, 2021  The mined materials from underground are either transported to the surface via trucks or via cable belt to be delivered to the processing plant. In contrast to open-pit or other surface mines where the materials are hauled by

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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 inrush during the transition from open-pit to ...

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Optimizing the Open Pit-to-Underground Mining Transition

open pit and underground operations independently and then merge the two, creating a myopic solution. We present a methodology to maximize the NPV for an entire metal deposit by determining the spatial expanse and production quantities of both the open pit and underground mines while adhering to operational pro-duction and processing constraints.

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Digging deeper: Mining methods explained Anglo

Learn more about open-pit mining. 2. Underground mining. Underground mining is used to extract ore from below the surface of the earth safely, economically and with as little waste as possible. The entry from the surface

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Differences between underground mining and

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

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Everything You Need To Know About Open Pit Mining

When compared to underground mining methods, open pit surface mining is considerably more efficient. 1. Increased Efficiency. One of the biggest benefits open pit mining produces is the growth in the overall efficiency when

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What Is Open-Pit Mining? Definition and Environmental Impact

Feb 22, 2022  Open-pit mining is a type of surface mining used to extract coal, gold, and other minerals. ... One of the most significant problems in open pit mining is also endemic to underground mining. The ...

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Major Open-Pit Copper Mines Move Underground E MJ

Chuquicamata Subterránea. After more than 100 years of production, Codelco’s Chuquicamata, one of the greatest open-pit copper mines, which is located in northern Chile, will deplete its surface minable reserves and move to underground production by 2018. This is a significant milestone for one of the world’s largest copper producers.

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Beyondold - Micromine - Technology for Mining

Micromine Beyond provides flexible, adaptable and comprehensive tools that enable you to streamline design and optimise your mine plan. A specialised toolset to optimise your mine site operation whether open-pit or underground. Powerful and intuitive tools for planning and designing surface and underground mines that support business fundamentals.

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Crown pillars - QueensMineDesignWiki

Open Pit to Underground Crown Pillar. Often when there is a deposit near surface with a considerable vertical extent, a combination of open-pit and underground mining will be used. These deposits will generally be exploited first by open-pit, due to the increased production capacity and safety, as well as the decreased capital and operating ...

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