underground mining transition

Optimizing the open pit to underground mining transition

The mining industry comments on the difficulty of modeling the transition correctly (Finch, 2012); however, decisions regarding the transition are becoming increasingly relevant (Araneda, 2015). Fig. 2 shows an open pit atop an underground mine.


A stochastic optimization formulation for the transition

After the transition is made to underground mining in year 9, a high penalty is incurred on deviations from ore targets to ensure that ore targets are met in the early years of the underground mine. This leads to a tight risk profile throughout the underground life of the mine (periods 914).


Transition to Underground mining at Chuquicamata Mine, Chile

Transition to Underground mining at Chuquicamata Mine, Chile Chuquicamata is the world's largest open pit mine, it has an elliptical shape and is 4.5 km long, 3.5 km wide and nearly 1 km deep. It is situated 2.870 m above the sea in Antofagasta, Chile and has been exploiting fine copper with high purity since 1910, although its quality was already known to pre Hispanic cultures.


(PDF) Open Pit to Underground Mining Where Is the

PDF 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.


Optimizing the Transition from Surface to Underground Mining

Background Formulation Solution Approach Results Variables wst = 1 if we transition underground at stratum s and time period t, 0 otherwise yst = 1 if stratum s starts to be mined via surface methods in time period t, 0 otherwise yst = 1 if stratum s starts to be mined via underground methods in time period t, 0 otherwise


Determining the open pit to underground transition A new

underground mining shapes considerably. Use workflows that rely on a combination of optimisation tools and judgement to make a wide range of planning decisions, including transition depth, in order to


THE TRANSITION FROM OPEN PIT TO UNDERGROUND

THE TRANSITION FROM OPEN PIT TO UNDERGROUND MINING AN At the Palabora Mine, the transition to caving 400 m below the bottom of the 800 m deep pit resulted in a slope failure of the North wall that began in 2003, and is still mobile. This failure can be explained by the daylighting into the cave zone of a prominent joint set. The


Measurement of displacement for open pit to underground

Open pit to underground mining transition is normally resulted from exhausting of shallow resources , , , . This is quite dangerous as it may threaten the stability of high steep slopes [49] . In order to ensure safety production of those mines, many research methods were adopted to investigate the stability of high steep slopes influenced by underground mining.


Mining Method Selection and Optimization of Transition

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


Open Cut and Underground Mining iMINCO

Underground Mining is generally used for areas where the mineral seam is too far underground for open cut mining to be of use. A tunnel, called a decline, is created to allow workers and machinery to reach the location of the minerals.


TRANSITION FROM OPEN PIT TO UNDERGROUND MINING

The planned transition from a large scale and deep open pit to underground cave mining at Chuquicamata is expected to face a number of unique geotechnical challenges,


BBE underway with two cooling installations for

As mining operations reach the end of their opencast reserves and transition to underground mining as a means to extend the life of mine and extract further value at depth, the ventilation and cooling of the underground workings become an integral part of the mining project.


A stochastic optimization formulation for the transition

the transition from open pit mining to underground (Fuentes and Caceres 2004)or approaches that can address the topic of technical risk management, similarly to approaches for open pit mining (e.g. Godoy and Dimitrakopoulos 2004; Montiel and


Martin Marietta site adds underground pit Pit Quarry

Martin Marietta plans to transition its Fort Calhoun Quarry in Fort Calhoun, Nebraska, from an open pit mining operation to an underground mining operation, the (Blair, Nebraska) Pilot Tribune Enterprise reports.. Martin Marietta hopes to begin constructing two tunnels that will run toward the quarry ground to the north side of the current pit by early 2017.


Stability of boundary pillars for transition from open pit

Underground mining began and reached a depth of 375 m below surface before the mine was once again closed in 2002 due to a low gold price and the requirement for capital to increase the depth of


Open Cut and Underground Mining iMINCO

Underground Mining A tunnel, called a decline, is created to allow workers and machinery to reach the location of the minerals. Stope mining is used for most hard rock mining of minerals such as copper, silver, lead and zinc.


THE TRANSITION FROM OPEN PIT TO UNDERGROUND

THE TRANSITION FROM OPEN PIT TO UNDERGROUND MINING AN At the Palabora Mine, the transition to caving 400 m below the bottom of the 800 m deep pit resulted in a slope failure of the North wall that began in 2003, and is still mobile. This failure can be explained by the daylighting into the cave zone of a prominent joint set. The


A model for determining optimal transition depth over from

A model for determining optimal transition depth over from open pit to underground mining E.Bakhtavar Amirkabir University of Technology, Iran The aim of this paper is a means of determining optimal transition depth from OP to Ug mining. This paper


Optimizing the Open Pit to Underground Mining Transition

Figure 2 (Transition Zone) The transition zone is an area where it is economically viable to extract material via open pit or underground mining methods. We see the open pit, black, encroaching on the underground mine, gray, in the transition zone.


About Advanced Mining Production Systems

Richard is a qualified mining engineer, graduating from the Western Australian School of Mines (WASM) in 2004 and has significant experience working in underground metalliferous projects in both operational and consulting environments.


A New Mining Scheme for Hanging Wall Ore Body during the

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


Underground Mining Market Global Industry Analysis, Size

Global Underground Mining Market Brief Account . Underground mining is considered as an efficient and reliable process for extracting heavily expensive material deposits that are not suited to surface mining techniques, or those deposits that are found at deeper levels inside the earth.


Optimization of the transition from open pit to

value from underground mining for each level. Further research resulted in a heuristic based approach to determining the transition depth (Bakhtavar et al. , 2008a).


Update SilverCrest Mines Reports Lower Production As

The decline isn't bad news, as it reflects the fact that the company is in a transition period from open pit to underground mining at its Santa Elena Project. So rather than the decline being a


Chuqui Underground A Huge Transition E MJ

Chuqui Underground will be a quantum leap relating to environmental care and respect for the surrounding communities, since underground mining reduces 97% of the emissions of particulate materials and lowers diesel consumption seven fold. To date, the project is 21% complete and the Gantt chart was being met as planned.


Update SilverCrest Mines' Transition To Underground

SilverCrest reported roughly flat earnings in Q3 and $2.3 million in cash flow on lower metal prices and expenses relating to the underground mining transition. I had anticipated this in my recent


Optimising Open Pit to Underground Cut over Part One

While underground mining has higher ore mining costs than open pit mining, the costs typically increase by less as a function of depth, as opposed to the contrary occurring in open pit mining. There is a point whereby the waste stripping to access additional ore at depth is greater than the underground mining


v117n12a9 A stochastic mathematical model for

mining by open pit and underground methods and transition from open pit to underground mining are among the most important challenges in mining engineering, and have been recently considered in many research investigations. Different researchers have attempted to solve these problems and presented solutions based on empirical,


Underground Mining Market Global Industry Analysis, Size

Global Underground Mining Market Brief Account . Underground mining is considered as an efficient and reliable process for extracting heavily expensive material deposits that are not suited to surface mining techniques, or those deposits that are found at deeper levels inside the earth.


NUMERICAL MODELING OF OPEN PIT (OP) TO

Numerical modeling of open pit (OP) to underground (UG) transition in coal mining 37 In recent years, with the development of computer science, numerical methods become more and more popular in solving problems of geo engineering. They prove particularly useful when their results are used for comparison with the results of observations under


A model for determining optimal transition depth over from

5th International Conference and Exhibition on Mass Mining, Lule229; Sweden 9 11 June 2008 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


Coal mining

Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content, and, since the 1880s, has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production.


Optimization of the transition from open pit to

account different cost values applicable in underground mining. Subsequently, Whittle programming (4 x) was developed to calculate the transition depth from open pit to underground mining. Using this method, decisions can be made by comparing operational scenarios of the open pit to underground transition (Tulp, 1998).


Martin Marietta quarry will go from open pit to underground

Martin Mariettas Fort Calhoun Quarry plans to transition from an open pit mine to an underground mine over the next four to five years. The Pilot Tribune Enterprise reports that Todd Clock, vice president of Martin Mariettas Des Moines District, says the project is just in its beginning stages, but the company is committed to making it happen.


Stornaway's Diamond Production Sales Slip in Q2 with

Canadian miner Stornoway Diamonds saw its sales and diamond output slip in the second quarter, with the results, quot;reflect[ing] the ongoing transition from open pit to underground mining and the introduction of ore waste sorting.quot;


Vale to transition Creighton deep zone to all electric fleet

The transition at Creighton, and wider adoption of electric vehicles, will necessarily take time, Allen said, because there are only so many companies that manufacture them. They have also only been making the vehicle sizes mining companies have requested, so


Vales Voiseys Bay nickel mine and concentrator is

Underground mining operations will extend the life of Voiseys Bay at least until 2032. At peak production, the underground mines will produce about 40,000 tonnes of nickel in concentrate per year, which we will ship to Vales Long Harbour facility to be processed into finished nickel.


Emerging trends in the mining industry MINING

Although underground mining was the dominating technique during the 20th century, mine production is undergoing a significant shift to open pit mining. In addition to the transition of

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