pit limit in open pit mining

Ultimate Pit Limit Optimization Methods in Open Pit Mines ...

Ultimate pit limit optimization plays a major role in the mining industry as it serves as the elementary foundation of all the activities in mine planning.

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[PDF] Determination of Ultimate Pit Limits in Open Mines ...

Planning and design procedure of an open pit mining project just can be started after ultimate pit determination. In the carried out study in this paper it was shown that the most important factor in ultimate pit determination and in consequence in the whole planning and design procedure of an open pit mine is the metal price. Metal price fluctuations in recent years were exaggerated and ...

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DETERMINATION OF ULTIMATE PIT LIMITS IN OPEN

2012-10-16  Abstract: Planning and design procedure of an open pit mining project just can be started after ultimate pit determination. In the carried out study in this paper it was shown that the most important factor in ultimate pit determination and in consequence in the whole planning and design procedure of an open pit mine is the metal price.

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Calculating ultimate pit limits and determining pushbacks ...

2021-8-1  A very important part of any open-pit mining project is determining the ultimate pit limits and optimizing the pushbacks. Currently, block models are the most widely used for calculating mineral resources and reserves. Block models can define the ultimate pit limits through algorithms like floating cone, Lerchs-Grossmann, PseudoFlow, etc.

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Open pit limit optimization using dijkstra’s algorithm

In open-pit mine planning, the design of the most profitable ultimate pit limit is a prerequisite to developing a feasible mining sequence. Currently, the design of an ultimate pit is achieved through a computer program in most mining companies. The extraction of minerals in open mining methods needs a lot of capital investment, which may take several decades.

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Open pit limit optimization using dijkstra’s algorithm

2021-8-17  In open-pit mine planning, the design of the most profitable ultimate pit limit is a prerequisite to developing a feasible mining sequence. Currently, the design of an ultimate pit is achieved through a computer program in most mining companies. The extraction of minerals in open mining methods needs a lot of capital investment, which may take several decades. Before the extraction, the pit limit, which influences the stripping ratio, damp locations, ore processing site and access routes, should be designed. So far, a large number of algorithms have been developed to optimize the pit limits. These algorithms are categorized into two groups: heuristic and rigorous. In this paper, a new approach is presented to optimize the pit limit

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Ultimate Pit Limit Determination Considering Mining ...

2019-11-30  Mergani H., Osanloo M., Parichehp M. (2020) Ultimate Pit Limit Determination Considering Mining Royalty in Open-Pit Copper Mines. In: Topal E. (eds) Proceedings of the 28th International Symposium on Mine Planning and Equipment Selection - MPES 2019. MPES 2019. Springer Series in Geomechanics and Geoengineering.

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(PDF) Stripping Ratios, Pit Limits Cutoff Grade ...

For open pit mining the costs are $0.40/ton ore and a stripping cost of $0.50/ton of waste. SR = (3.00 –0.40)/0.50 = 5.2 tons of waste/ ton of ore i.e. while the stripping ratio is less than 5.2 it is most economical to mine the deposit by open pit.

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Inter-ramp and bench design of open-pit mines: the

2019-1-12  pit has a length of 2400 m and its width varies between 150 and 400 m, Fig. 4a. The depth of the pit reaches a maximum of 120 to 150 m at its southern portion, with the central pit region (where the orebody outcrops at the surface) being shallower, while the northern part of the pit is about 100 m deep. The pit surface is defined by 106353 blocks.

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Determination of Optimum Production Capacity and

2017-9-13  The algorithms that optimize ultimate pit limits conventionally search for an ultimate contour, which maximizes the total sum of the profits of all the blocks within the contour. The optimal ultimate pit limit is an important key for long term strategic planning. Current algorithms assume that this contour is excavated at once without considering the time aspect of the problem. The planning of an open pit mine considers the temporal nature of the exploitation to determine the sequence of block extraction in order to maximize the generated income throughout the entire planning period. It can be stated that mine planning, as an economic exercise, is constrained by certain geological, operational, technological, and local field circumstances. The mine

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Open pit limit optimization using dijkstra’s algorithm

2021-8-17  open mining methods needs a lot of capital investment, which may take several decades. Before the extraction, the pit limit, which influences the stripping ratio, damp locations, ore processing site and access routes, should be designed. So far, a large number of algorithms have been developed to optimize the pit limits.

More

Open pit limit optimization using dijkstra’s algorithm

In open-pit mine planning, the design of the most profitable ultimate pit limit is a prerequisite to developing a feasible mining sequence. Currently, the design of an ultimate pit is achieved through a computer program in most mining companies. The extraction of minerals in open mining methods needs a lot of capital investment, which may take several decades.

More

Development and application of optimum open-pit limits ...

2021-8-10  In order to rationally determine the open-pit mining boundary in the combined mining of surface and underground, this paper discusses some problems of the optimum pit-limit in combined mining and analyses the usability of moving cone method for combined mining.

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Dig-Limit Optimization in Open Pit Mines through

2019-10-15  Dig-limit optimization is an operational decision-making problem that significantly affects the value of open-pit mining operations. Dig-limits, traditionally drawn by hand, classify practical ore and waste boundaries suiting equipment sizes in a bench. An optimization approach based on genetic algorithms (GAs) was

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Open Pit Mine Planning and Waste Management

2016-9-14  Fig. 1. Open pit mining operations (Scott Dunbar, 2012) 3. Open Pit Mine Planning and Scheduling Extracting the blocks from the mine in specific sequence to give the highest net present value (NPV) is known as open pit mine planning and scheduling. This is subject to a variety of production, grade blending and pit slope constraints (Whittle, 1989).

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Mining Options Optimization: Open Pit to Underground

2015-9-10  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

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An Open Pit Design Model - SAIMM

2010-9-27  An Open Pit Design Model By R. H. ROBlNSON nod N. B. PRENN ... Additionally. summaries are printed of the block mining sequence and cash flow. A special feature is an option to include dump-leaching operations. Stockpiling of material can also be simulated by the model. ... ning is in the design of pit limits. The deposit is divided into

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Determination of Optimum Production Capacity and

2017-9-13  costs, mining capacity, discount rate and recovery percentage [12]. The algorithms that optimize ultimate pit limits conventionally search for an ultimate contour, which maximizes the total sum of the profits of all the blocks within the contour. The optimal ultimate pit limit is an important key for long term strategic planning.

More

Selection of practical bench height in open pit mining ...

2015-9-9  Key words: Open pit mining, bench height, multi-criteria decision making. INTRODUCTION As a definition in open pit mining, bench height is the vertical distance between crest and toe of the bench (Fourie and Dohm, 1992). Determination of optimum bench height is a major concern in most open pit

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Inter-ramp and bench design of open-pit mines: the

2019-1-12  pit has a length of 2400 m and its width varies between 150 and 400 m, Fig. 4a. The depth of the pit reaches a maximum of 120 to 150 m at its southern portion, with the central pit region (where the orebody outcrops at the surface) being shallower, while the northern part of the pit is about 100 m deep. The pit surface is defined by 106353 blocks.

More

Development and application of optimum open-pit limits ...

2021-8-10  In order to rationally determine the open-pit mining boundary in the combined mining of surface and underground, this paper discusses some problems of the optimum pit-limit in combined mining and analyses the usability of moving cone method for combined mining.

More

Dig-Limit Optimization in Open Pit Mines through

2019-10-15  Dig-limit optimization is an operational decision-making problem that significantly affects the value of open-pit mining operations. Dig-limits, traditionally drawn by hand, classify practical ore and waste boundaries suiting equipment sizes in a bench. An optimization approach based on genetic algorithms (GAs) was

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GEOTECHNICAL CONSIDERATIONS IN OPEN PIT MINES

2021-8-30  limit the general duty of care in the Act, and the requirements remain current as the understanding of geotechnical issues improves. It is recognised that open pit mining experience and professional judgement are important aspects of geotechnical engineering that are not easily quantified, but can contribute

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An Open Pit Design Model - SAIMM

2010-9-27  An Open Pit Design Model By R. H. ROBlNSON nod N. B. PRENN ... Additionally. summaries are printed of the block mining sequence and cash flow. A special feature is an option to include dump-leaching operations. Stockpiling of material can also be simulated by the model. ... ning is in the design of pit limits. The deposit is divided into

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

2012-12-13  mining method (open-pit or underground). This constraint allows a block to be left in form of waste or in the crown pillar. It also ensures that if a waste block is located within the open-pit limit or underground layout, it inevitably has to be mined. According to inequality [2], these constraints can be

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Optimized open pit mine design, pushbacks and the gap ...

2016-12-13  OPTIMIZED OPEN PIT MINE DESIGN, PUSHBACKS AND THE GAP PROBLEM—A REVIEW 511 JOURNAL OF MINING SCIENCE Vol. 50 No. 3 2014 Fig. 3. Graph G with dummy node x0 and arcs added from the dummy node x0 to all other nodes. It is clear from the definition of our graph G that a graph closure in G represents a physically feasible pit, if not, then a block not in our closure

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Mining Options Optimization: Open Pit to Underground

2015-9-10  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

More

Selection of practical bench height in open pit mining ...

2015-9-9  Key words: Open pit mining, bench height, multi-criteria decision making. INTRODUCTION As a definition in open pit mining, bench height is the vertical distance between crest and toe of the bench (Fourie and Dohm, 1992). Determination of optimum bench height is a major concern in most open pit

More

Inter-ramp and bench design of open-pit mines: the

2019-1-12  pit has a length of 2400 m and its width varies between 150 and 400 m, Fig. 4a. The depth of the pit reaches a maximum of 120 to 150 m at its southern portion, with the central pit region (where the orebody outcrops at the surface) being shallower, while the northern part of the pit is about 100 m deep. The pit surface is defined by 106353 blocks.

More

Pit Optimization – How I View It

2015-6-3  Pit Optimization – How I View It. One of the first steps in open pit mine design is the pit optimization analysis. Pit optimization is used to define the most profitable pit shell (or nested pit shells) for a given set of economic parameters. The economic

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