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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

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(PDF) Transition from Open-Pit to Underground as a

Additionally, the transition in the mining operation from open-pit to the underground, i.e., OP to UG transition [8, 9], triggers a requirement to improve the quality and precision of the ...

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Transition from Open Pit to Underground Mine

2021-2-15  Key considerations to evaluate are: open pit stability, shaft stability, dilution, mud rushes and air blasts, and mining method selection. Planning Considerations: The efficient transition from open pit mining to an underground operation requires extensive planning. For a large mining operation, planning could last as long as 20 years.

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

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].

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How to transition open-cast mines to

2021-2-28  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 owners around the world explore the feasibility of underground

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Open Pit To Underground Transition - Cave

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 – using Mixed ...

2017-1-30  Transition from open-pit to underground – using Mixed Integer Programming considering grade uncertainty J.CHUNG1* 2 , E. TOPAL and O.ERTEN3 1,2,3Department of Mining Engineering and Metallurgical Engineering –Western Australia School of Mines, Australia, [email protected] *presenting author Abstract

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Optimizing the Open Pit-to-Underground Mining Transition

2016-7-11  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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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

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Open Pit To Underground Transition - Cave Mining

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.

More

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

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].

More

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.CHUNG1* 2 , E. TOPAL and O.ERTEN3 1,2,3Department of Mining Engineering and Metallurgical Engineering –Western Australia School of Mines, Australia, [email protected] *presenting author Abstract

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Optimizing the Open Pit-to-Underground Mining Transition

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 Engineering Department, Golden, Colorado,

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Considerations for open pit to underground transition ...

Scenario 2 – Underground mining below existing open pit. 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 ...

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Planning Considerations For Transition From Open Pit

Key considerations to evaluate are: open pit stability, shaft stability, dilution, mud rushes and air blasts, and mining method selection. Planning Considerations The efficient transition from open pit mining to an underground operation requires extensive planning. For a large mining operation, planning could last as long as 20 years.

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Transition from Open Cut to Underground Coal

At some time in the mining life of an open cut coal deposit, consideration is usually given to determine the point at which underground mining becomes an economic proposition or even necessary. This can occur anywhere from the pre-feasibility project stage to decades after commencement of mining. Options which can be considered include the extension...

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Optimizing the open pit-to-underground mining

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 to maximize the NPV for

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An approach towards ascertaining open-pit to

2017-5-24  As a rule, Open-Pit (OP) method is considered to be more approvable and dominant than Underground (Ug), especially in recovery, production capacity and mechanization, grade control and cut off grade, ore lose and dilution, flexibility, safety, and so on (Bakhtavar Shahriar, 2007). Even though, Ug mining is more acceptable from environmental (for

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Optimizing the Extraction Strategy for Open Pit and ...

2018-9-4  Finding the most suitable location of the crown pillar in a combined mining method of open pit and underground operations, especially in block caving method, is one of the most interesting problems for mining engineers today (Bakhtavar et al., 2012). The transition from open pit to underground mining involves a complicated geomechanical process.

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

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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.

More

Planning Considerations For Transition From Open Pit

Key considerations to evaluate are: open pit stability, shaft stability, dilution, mud rushes and air blasts, and mining method selection. Planning Considerations: The efficient transition from open pit mining to an underground operation requires extensive planning. For a large mining operation, planning could last as long as 20 years.

More

Transition from Open Cut to Underground Coal

At some time in the mining life of an open cut coal deposit, consideration is usually given to determine the point at which underground mining becomes an economic proposition or even necessary. This can occur anywhere from the pre-feasibility project stage to decades after commencement of mining. Options which can be considered include the extension...

More

Planning Considerations For Transition From Open Pit

Key considerations to evaluate are: open pit stability, shaft stability, dilution, mud rushes and air blasts, and mining method selection. Planning Considerations The efficient transition from open pit mining to an underground operation requires extensive planning. For a large mining operation, planning could last as long as 20 years.

More

Open pit to underground Nowadays the transition

Open pit to underground Nowadays, the transition from surface to UG mining and OP mines operating over old UG workings are the most prominent case of OP – UG interaction. Currently, there are several large OP mines (eg Chuquicamata, Chile; Grasberg, Indonesia; Bingham Canyon, USA and Resolution, USA) conducting engineering studies to make the transition from OP to UG mining via caving ...

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Smooth transition from underground to open pit mining

2016-4-29  underground to open pit mining Maptek Technical Services staff have been consulting on site to help with the project, which is complex in nature due to the transition between the current underground mine and the proposed open pit. Its greatest benefits are that results are

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

T1 - Use of an artificial crown pillar in transition from open pit to underground mining. AU - Xu, Shuai. AU - Suorineni, Fidelis T. AU - An, Long. AU - Li, Yuan Hui. AU - Jin, Chang Yu. PY - 2019/5/1. Y1 - 2019/5/1. N2 - In the transition from open pit to underground mining, a crown pillar is usually left at the open pit

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An approach towards ascertaining open-pit to

2017-5-24  As a rule, Open-Pit (OP) method is considered to be more approvable and dominant than Underground (Ug), especially in recovery, production capacity and mechanization, grade control and cut off grade, ore lose and dilution, flexibility, safety, and so on (Bakhtavar Shahriar, 2007). Even though, Ug mining is more acceptable from environmental (for

More

[PDF] A New Mining Scheme for Hanging-Wall Ore

A new mining scheme by employing the induced caving mining method to exploit hanging-wall ore-body during the transition from open pit to underground mining is proposed. The basic idea is to use the mined-out area generated by the planned mining of the hanging-wall ore-body to absorb the collapsed slope body, so as to avoid the influence of the inner-slope mining to the normal open-pit mining ...

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