Gr5finalUnderground Mining Method Ppt - Free download as Powerpoint Presentation (ppt / pptx), PDF File (pdf), Text File (txt) or view presentation slides online Underground Mining Methods Group 5 Underground Mining Methods Coal Mining Metal Mining Bord and Pillar Unsupported Mining Supported Mining Caving mining Longwall Room and Pillar Cut and fill Longwall Blasting galllery ,
Coal mining - Coal mining - Choosing a mining method: The various methods of mining a coal seam can be classified under two headings, surface mining and underground mining Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods, and the choice of which method to use in extracting a coal seam depends on many ,
Block caving is essentially the underground version of open-pit mining It’s the only underground mining method that can reach similar production rates to surface mining operations, up to over 100,000 tonnes per day The method involves undermining an ore body, then allowing it ,
Nov 02, 2011· Underground mining, Underground mining methods Lecture 4: Underground Mining 1 Hassan Z Harraz [email protected] 2010- 2011 This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors
Cut and Fill mining is a method of short hole mining used in narrow ore zon An access ramp is driven off the main level to the bottom of the ore zone to be accessed Using development mining techniques a drift is driven through the ore to the defined limit of mining
Underground Mining Methods presents the latest principles and techniques in use today Reflecting the international and diverse nature of the industry, a series of mining case studies is presented covering the commodity range from iron ore to diamonds extracted by operations located in all corners of the world Industry experts have contributed 77 chapters
Apr 14, 2014· Underground mining methods: These are the methods/techniques employed when the depth of the deposit,the stripping ratio of the overburden to ore,or both becomes excessive to surface exploitation Choice of an underground mining method is often closely related to the Geology of the deposit and degree of ground support necessary to make the .
Underground Mining Methods Handbook More than 40 chapters covering such underground mining topics as sampling, planning, Mining: Selections from Underground Mining Methods Handbook Source: Added Economical Competitiveness of Explosive-free Methods - Working a Gold Placer Deposit Underground by Hand
In any discussion of Methods of Underground Mining Comparison, one is repeatedly confronted with the difficulty of dealing with so many variable conditions It is not an exact science and in the choice of a method each varying factor has a certain weight, which, in many cases, experience alone can determine
Underground Mining Methods and Technology Edited by AB Szwilski, MJ Richards Volume 1, Pages 1-472 (1987) Download full volume Previous volume Next volume Actions for selected chapters Download PDFs Export citations Show all chapter previews Show all chapter previews
There are four main mining methods: underground, open surface (pit), placer, and in-situ mining Underground mines are more expensive and are often used to reach deeper deposits Surface mines are typically used for more shallow and less valuable deposits
Underground mining is carried out when the rocks, minerals, or precious stones are located at a distance far beneath the ground to be extracted with surface mining To facilitate the minerals to be taken out of the mine, the miners construct underground rooms to work in
A highly productive underground mining method, longwall mining is used in a large horizontal spread of thin-bedded deposits of uniform thickness usually ranging from 06m to 1m Used a lot by South African gold mining companies, this method can be used in both soft and hard rocks as the working area along the mining face can be supported .
Mining method selection by multiple criteria decision making tools by MR Bitarafan and M Ataei* Synopsis Mining method selection is the first and most important problem in mine design In this selection some of the parameters such as geological and geotechnical properties, economic parameters and geographical factors are involved
Underground mining: room-and-pillar mining of thick seams –“Benching” Different approaches allow either the top or bottom part of the seam to be mined out first
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appropriate mining method is selected based on technical, economic, and environmentally accountable considerations The first step in selecting the most appropriate mining method is to compare the economic efficiency of extraction of the deposit by surface and underground mining methods This section reviews surface mining methods and .
Mining - Mining - Underground mining: When any ore body lies a considerable distance below the surface, the amount of waste that has to be removed in order to uncover the ore through surface mining becomes prohibitive, and underground techniques must be considered Counting against underground mining are the costs, which, for each ton of material mined, are much higher underground than on ,
The choice of an underground mining method depends on a range of factors and these include; the size and shape of the deposit, the orientation or slope of the deposit, the depth of the deposit, geological structures, characteristics of the ore and the surrounding rocks and issues with gas and water In combination, these factors allow us to determine an appropriate arrangement and sequence for .
1 Underground Mining Methods 11 Classification of Underground Mining Methods Mineral production in which all extracting operations are conducted beneath the ground surface is termed underground mining Underground mining methods are usually employed when the depth of the deposit and/or the waste to ore ratio (stripping ratio) are
mining is the most common, representing more than half of all underground production In this method, a continuous mining machine excavates the coal and loads it onto a conveyor or shuttle car in a single step Despite the term “continuous,” the machine operates only part of the working time, because after mining advances
Other underground mining methods may result in waste rock dilution from caving roofs and hanging walls Often 20 to 30% of the extracted tonnage is country rock, resulting in extra costs Surface mining of regular and stratified deposits can limit the overall ore ,
An underground mine consists of the portals (entrance and exits to the mines), mains, submains, panels, and working fac The panels are the working sections of the production operation Depending on the mining method, a working section can have one or more working fac The mining ,
Underground soft rock mining is a group of underground mining techniques used to extract coal, oil shale, potash and other minerals or geological materials from sedimentary ("soft") rocks Because deposits in sedimentary rocks are commonly layered and relatively less hard, the mining methods used differ from those used to mine deposits in igneous or metamorphic rocks (see Underground mining .
Jan 27, 2014· Undergrounds mining is still, even after hundreds of years of safety improvements, a dangerous and expensive business It’s wise for an investor to understand both the basic workings for an underground mine and the risks associated with underground mining A bad ,
Mar 15, 2017· Block (gravity) caving is a bulk underground mining method, which allows large low-grade deposits to be mined underground This method involves undermining the orebody to make it collapse under its own weight into a series of chambers from which the ore extracted It is a useful technique to extend .
Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, usually those containing metals such as ore containing gold, silver, iron, copper, zinc, nickel, tin and lead, but also involves using the same techniques for excavating ores of gems such as diamonds or rubi
Jul 25, 2018· Block caving is a new alternative method of developing new mines or extending the operation of open pits Block caving is an underground hard rock mining method that involves undermining an ore body, allowing it to progressively collapse under its own weight It is the underground version of open pit mining
Underground mining is more complex and more expensive than open-pit mining Where removing the overburden would be too costly or ineffective to reach the ore, the decision is made to go underground After open-pit mining is complete, valuable ore can be mined through underground mining methods
Jul 21, 2016· Underground mining is the process of extracting minerals and ores that are located too far underground to be mined efficiently using surface mining methods The primary objective of underground mining is to extract ore safely and economically while minimizing handling of waste rock Typically, underground mine has less environmental impact