from open pit to underground



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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 faciliti...

Transition from Open Pit to Underground Mine

Transition from open pit to underground mining often risks mud rushes if mud forming minerals are present , and from sumps and surface dams Air blasts can result from underground collapses or mud rush The presence of an abandoned pit above can lead to greater risks of dilution and mud rush...

OPEN PIT MINING THROUGH UNDERGROUND WORKINGS

OPEN PIT MINING THROUGH UNDERGROUND WORKINGS 10 INTRODUCTION A number of open pit mines in Western Australia WA are mining orebodies that have previously been mined by underground methods There are hazards with high risk potential which develop where open pit mines approach and then progressively mine through underground workings...

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...

Underground versus Open Pit Mining

Unlike open pit, underground mining requires that you take into account a wide variety of added requirements These include complex ventilation systems, area and local ground support, and of course finding a consistent, safe, and cost-effective way to get your materials to the surface...

TRANSITION FROM OPEN

underground and in open-pit and the removal cost of waste in relation to 1 ton of ore extracting by open-pit 16, 17 In 1982 an algorithm by Nilsson based upon cash flow and Net Present Value ....

A stochastic optimization formulation for the transition ,

Jul 11, 2017 0183 32 As open pit mining of a mineral deposit deepens, the cost of extraction may increase up to a threshold where transitioning to mining through underground methods is more profitable This paper provides an approach to determine an optimal depth at which a mine should transition from open pit to underground mining, based on managing technical risk...

Optimising Open Pit to Underground Cut

Mar 20, 2018 0183 32 Many mines combine open pit with underground mining, and on many occasions the underground mine is an extension of the open-pit This article is the first of two articles that looks at some of the challenges associated with this situation, and some methods with which to determine the cut-over point from open pit to underground mining and the implications these have on project value...

How to Cook a Pig in a Pit

It s one of the oldest methods of cooking Dig a hole in the ground, fill it with fire, add a large animal, cover and cook Most people recognize it as the Hawaiian Luau or more accurately, Kalua PigWhile lots of people do this in many different ways, there are a few basic steps you can take to make it ,...

Open Pit Mining Pros Cons Sciencing

Open pit mining -- or strip mining -- is an extraction process for ore or fossil fuels that takes place at the surface of a mining site Worldwide, 40 percent of mining occurs at the surface, according to Greenpeace International Compared with underground mining, surface mining is much more efficient...

INDONESIA Freeport

During fourth-quarter 2019, PT-FI completed mining the final phase of the Grasberg open pit and continues to achieve important milestones in ramping-up production of large-scale quantities of copper and gold from its significant underground ore bodi...

from open pit to underground

Open-pit mining can also be identified as open-cast or open cut mining The practice operates above ground, always at the surface, extracting minerals and rocks from the surface Open-pit mining presents less dangers in comparison to underground mining these surface mines do not need to tackle issues such as air loss and cave...

The Mining Life Open Pit vs Underground

Aug 22, 2017 0183 32 Open pit and underground mines are often in remote locations that require miners to work and live on mining camps for long periods of time, which can cause psychological problems that manifest themselves in dangerous situations...

Open Pit to Underground Transition

the underground mine is typically an extension of the pit As open pit mining deepens the stripping ratio typically increases, increasing the overall mining costs As a result companies often strategically transition between surface and underground to maximise project value and to increase resource extraction...

What are the pros and cons of subsurface mining?

Advantages of underground mining less surface disturbance less environmental disturbance less waste mined per tonne of ore ability to mine resources that are not economic as a surface mine cheaper to set up mine development for deep ore depo....

Optimizing the Open Pit

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, 180 Santiago, 7941169, Chile cColorado School of Mines, Mechanical Engineering Department, Golden, Colorado, ,...

The Advantages of Open Pit Mining Sciencing

Open pit mining does offer some advantages over traditional deep shaft mining Pit mining is more cost effective than shaft mining because more ore can be extracted and more quickly The working conditions are safer for the miners because there is no risk of cave in or toxic gas Open pit ,...

A Comparative Study of Ground and Underground Vibrations ,

Ground vibrations originating from bench blasting may cause damage to slopes, structures, and underground workings in close proximity to an operating open-pit mine It is important to monitor and predict ground vibration levels induced by blasting and to take measures to reduce their hazardous effects The aims of this paper are to determine the weaker protection objects by comparatively ....

Mining Sites The Transition from Open

Jul 10, 2019 0183 32 While both underground and open-pit mining are widely accepted mining processes, there is a greater inclination to further expand underground mining This transition from open-pit to underground begins when open-pit mines are exhausted or inaccessible meaning, they have either been depleted of minerals, rocks, and resources, or they are ....

PDF Transition from Open

Transition from Open-Pit to Underground as a New Optimization Challenge in Mining Engineering Article PDF Available in Journal of Mining Science 45 5 485-494 September 2009 with 2,861 Reads...

An approach towards ascertaining open

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...

Optimising Open Pit to Underground Cut

Apr 05, 2018 0183 32 Given that underground mining profits are less dependent on depth there will likely be a point where the marginal profit of the underground exceeds that of the open pit Using this method the cut-over point is the depth at which the marginal profit from the open-pit is equal to the marginal profit from the underground...

Underground Mining

Underground mining tends to have a better reputation when it comes to geomorphic impacts, compared to other mining methods, ie open pit mining The truth of the matter is that more often than not, open pit mining and underground mining go hand-in-hand...

Guyana Goldfields could lay off as many as 85 of ,

May 12, 2020 0183 32 Guyana Goldfields could lay off as many as 85 of employees-in transition from open pit to underground mining The Guyana Goldfields site By Stabroek News May 12, 2020...

Open pit to underground mining rock stability and security ,

Paperback Pub Date 2013-11-01 Pages 182 Language Chinese Publisher Metallurgical Industry Press Product Name open pit to underground mining of rock stability and security Disaster South Shi Shuqing ISBN Number 9787502464004 Publisher Metallurgy industry Press Item Type Book published 2013 -11-01 time 2013 -11-01 Description This book is aimed Shirengou spot iron ore ....

Determining the open pit to underground transition A new ,

method into pit optimisation software that takes into account the value that ore has if mined by underground method Consider a case in which some blocks can be mined by either open pit or underground method For any such block, the value used for pit optimisation must be the difference between its open pit value and its underground value...

THE TRANSITION FROM OPEN PIT TO UNDERGROUND ,

faults crossing the pit and 3 dominant joint sets ubiquitous in the mine Ground water is also present 800m 400m Figure 1 Birds-eye view of Palabora Mine and 3D model of pit and cave After completion of the open pit mining, a cave was initiated about 400 m below the pit floor, as shown in Figure 1...

Open Pit To Underground Transition

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...

Optimization of the transition from open

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...

Optimizing the open pit

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 an entire metal deposit by determining the spatial expanse and production quantities of both the open pit and underground mines while adhering to ....