"from open pit to underground"

【open_pit_to_underground】_open_pit_to ...

open pit to underground ,、 。 For a mine to be changed from an open pit to underground stope, the stability of the ...

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

Situated in north-west Queensland, Australia, the Ernest Henry Mine (EHM) has been producing copper and gold since 1996. Owned and operated by Glencore Xstrata, ore is currently sourced from a newly developed underground sublevel cave (SLC) mine below the old EHM open pit (the pit). Ore feed to the concentrator is supplemented by satellite open pits comprising the Mount Margaret operation.The ...

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

Transition from open-pit to underground – using Integer ...

Abstract. The determination of transition point from open-pit (OP) to underground (UG) is one of the most challenging mining engineering problems. The shallow deposits which vertically extend to considerable depth will have potential to make the transition from OP to UG. In this paper, Mixed Integer Programming (MIP), a well-known operation ...

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.

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 eventually come to a ''transition point'' where the decision needs to be taken whether to extend the pit or switch to UG mining.

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

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 underground (and in open-pit) and the removal cost of waste in relation to 1 ton of ore extracting by open-pit [16, 17].

Operations Strategy Formulation: Shifting From Grasberg ...

2021-4-1 · PT Freeport Indonesia has decided to alter its mining operations from open-pit mining to underground mining in Grasberg. A change of mining area focus directly affects its related departments, and even need new operations strategy to address the transition. Considering its long-term run of mining operations, its strategic issues are assessed by ...

Considerations for open pit to underground transition ...

Scenario 3 – Open pit mining through existing underground working. This paper provides an introduction in contextual information that practitioners, having to deal with open pit underground interaction, need to consider. Keywords: transition, open pit underground interaction, risk management, operational considerations 1 Problem statement

Optimizing the Open Pit-to-Underground Mining …

2016-7-11 · 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.

Mining Options Optimization: Open Pit to Underground

2015-9-10 · 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 sooner, the mining cost differential for open pit mining is more than compensated for by the

Paper: Considerations for open pit to underground ...

Abstract: A large volume of work is available in the industry on many aspects relating to the interaction between open pit and underground mining. Various authors have addressed the optimisation of the transition problem to determine the optimal economic point to transition from open pit mining to underground mining.

Mining Sites: The Transition from Open-Pit to …

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

Open Pit to Underground – The Times are Changing

2021-6-23 · Open Pit to Underground – The Times are Changing Published on June 23, 2021 June 23, 2021 • 165 Likes • 10 Comments

Optimizing the open pit-to-underground mining transition ...

2017-2-16 · 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 termining which method(s) to use is typically based on geotechnical constraints ...

THE TRANSITION FROM OPEN PIT TO UNDERGROUND …

2006-3-22 · 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

v116n8a13 Where to make the transition from open-pit …

2016-9-14 · 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.

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 to establish production continuity at a suitable rate to maximize use of existing surface processing facilities.

Optimizing the Extraction Strategy for Open Pit and ...

2018-9-4 · open pit and underground mining transition problems. The model determines an optimized mining strategy for a deposit that is potentially amenable by both open pit and underground mining options. A synthetic copper deposit and a small gold deposit is used as a case study to implement

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

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.

(PDF) Transition from surface to underground mining ...

Although increasing attention has been paid to the deformation of the open-pit rock mass after transition from open-pit to underground mining (Beck and Pfitzner …

NUMERICAL MODELING OF OPEN PIT (OP) TO …

2016-10-19 · of open pit mines or underground mines, their opera-tion is nowadays being run at constantly increasing depths, whereas in the case of open pit mines, further increase of exploitation depth proves impossible due to economic and technological limitations, as well Table 1. Overview of major historical and future OP-UG transitions for ore body ...

South Africa''s Largest Open-Pit Mine

2019-7-29 · References & Resources. Basson, I. et al. (2017) Structural analysis and 3D modelling of major mineralizing structures at the Phalaborwa copper deposit. Ore Geology Reviews, 83 (2017), 30–42. Brummer, R. K. et al., The Transition From Open …

Ernest Henry: From open cut to underground

2012-4-11 · The Ernest Henry open pit mine had reached a final depth of over half a kilometre and was a substantial 1.5 kilometres long and 1.3 kilometres wide. "Now the focus is on completing the ...

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 Abstract

Use of an artificial crown pillar in transition from open pit to …

Mining Options Optimization: Open Pit to Underground

How to transition open-cast mines to underground …

2020-10-2 · As open-pit mines reach their economic end of life, mine owners are considering the viability of transitioning their open-cast mining operations to underground. Drawing on their deep level mining expertise in South Africa, Worley assists mine …

Transitioning from Open Pit to Underground Mass Mining ...

2015-5-10 · This paper reports the findings of a comprehensive research programme focussed on investigating and integrating new developments in remote sensing characterization and monitoring technologies with state-of-the-art numerical modelling to better manage the challenges and geo-risk associated with the transitioning from open pit to underground mass ...

Transition from open-pit to underground – using Integer ...

The determination of transition point from open-pit (OP) to underground (UG) is one of the most challenging mining engineering problems. The shallow deposits which vertically extend to considerable depth will have potential to make the transition from OP to UG. In this paper, Mixed Integer Programming (MIP), a well-known operation research technique is introduced to solve the transition problem.

Planning Considerations For Transition From Open Pit To ...

2020-8-23 · Open Pit Mine Design, Planning, and Engineering Underground Mine Design, Planning, and Engineering Mining Geology for Planning and Optimization