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· Auger mining is a mining method that recovers coal or other minerals from under the highwall when the ultimate stripping ratio has been achieved in open cast mining operations or Auger mining refers to a method for recovering coal from thin seams to thick beyond a highwall produced by conventional open cast or strip mining area mining or contour mining or from seams
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· In order to study the influence of depth thickness ratio on bedding slope stability whose sliding surface is flexural concave in shape under mining conditions this paper aims to study the characteristics of deformation and damage of bedding sliding with depth thickness ratios of 200 1 150 1 120 1 100 1 and 50 1 by adopting numerical simulation analysis software combined with laboratory
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mining engineering STRIPPING RATIO S Oct 16 2015· SURFACE MINING • Surface mining is done by removing stripping surface vegetation dirt and if necessary layers of bedrock in order to reach buried ore deposits or surface mining is the process of extraction of minerals by removal of overburden • Overburden is the rock or waste material which is lying on the mineral to be owned
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· 1 Overview Surface mining involves the extraction of mineral commodity on the earth s surface and in the open air Surface mines can be fully mechanized partly mechanized or labour intensive Large scale operations with high production rates are normally fully mechanized while small scale operations as with alluvial and artisanal mining
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impact surface water for several miles downstream of the placer mine Underground mining In underground mining a minimal amount of overburden is removed to gain access to the ore deposit Access to this ore deposit is gained by tunnels or shafts Tunnels or shafts lead to a more horizontal network of underground tunnels that directly access the ore In an underground mining method
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Post pillars are used in cut and fill mining and they provide immediate support to the roof while enabling reasonably high extraction ratio As the mining progresses the pillars become more slender This causes the stability to decrease during the first few cuts Post pillars are designed to fail gradually with increasing height Pillar must be stable in the first cut and gradually show signs
Get Priceand surface and finally low capital intensity The last mentioned point is particularly important in an environment ofexpansion Themain disadvantages ofbord and pillar mining are that coalhastobeleftinsitutosupport theroofstrata andthat thelabour productivity isrelatively lowwhen compared with opencast and longwall mining systems It isimportant tonote that both the amount ofcoal being
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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 too great to commence a surface operation Once the economic feasibility has been verified the most appropriate mining methods must be selected according to the natural/geological conditions and spatial/geometric
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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 also involves the same techniques used to excavate ores of gems such as diamonds and rubies Soft rock mining refers to the excavation of softer minerals such as salt
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· Stripping ratios aren t often discussed but they can be an early and important indicator for mining projects Here s what investors should know about them
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· Surface mining requires most often waste removal waste removal cost money and lowers profit c Break even point exists at which both surface and u/g mining are equally un profitable Remember the Motherhood statements d Stripping ratio allows definition of this breakeven point Switch to underground mining if your stripping ratio is more than BESR a May or may not be
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· Surface mining requires most often waste removal waste removal cost money and lowers profit c Break even point exists at which both surface and u/g mining are equally un profitable Remember the Motherhood statements d Stripping ratio allows definition of this breakeven point Switch to underground mining if your stripping ratio is more than BESR a May or may not be
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ratio is reached in contour mining or in slot mining when surface access to a reserve is limited A significant attribute of the highwall miner is its versatility HWM has been used successfully to mine abandoned pre reclamation law highwalls points or ridges uneconomic to mine by underground or other surface methods outcrop barriers left adjacent to underground mines separate benches of
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After going through this lecture you will be able to 1 list and define stripping ratios K C 2 calculate various stripping ratios for given situations C Ap 3 explain the influence of stripping ratios on planning decisions A S 4 assess the most economic method of mineability of a deposit by surface mining or underground mining from the limiting stripping ratio A S E
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Energy Efficiency Ratios of Surface Mining Systems for a Small Iowa Coal Mine 1 T S COLVIN S ] MARLEY and C E ANDERSON Department of Agricultural Engineering Iowa State University Ames Iowa 50011 The normal criterion used to determine if a mining venture should be started or continued is its financial profitability Energy efficiency is another criterion for dealing with
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· Bear in mind that the ratios will usually have to be adjusted as one learns more about how the particular rock reacts when blasted In construction and in surface mining millisecond delays are used between charges in a blast There are several basic reasons for doing so To assure that one or more free faces progress through the shot providing a consistent burden To enhance
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Design modify and simulate your surface mine The Carlson Surface Mining module enables users to find the most efficient mine design by testing layouts in plan section and 3D view Highlights include Integrate geologic and surface modeling with plan view 3D view and section view mine layout routines Generate accurate calculations of overburden ore quantities strip ratios rehandle
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ratio is reached in contour mining or in slot mining when surface access to a reserve is limited A significant attribute of the highwall miner is its versatility HWM has been used successfully to mine abandoned pre reclamation law highwalls points or ridges uneconomic to mine by underground or other surface methods outcrop barriers left adjacent to underground mines separate benches of
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mining engineering STRIPPING RATIO S Oct 16 2015· SURFACE MINING • Surface mining is done by removing stripping surface vegetation dirt and if necessary layers of bedrock in order to reach buried ore deposits or surface mining is the process of extraction of minerals by removal of overburden • Overburden is the rock or waste material which is lying on the mineral to be owned
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· The following ratios can be used as first approximations in designing blasts Bear in mind that the ratios will usually have to be adjusted as one learns more about how the particular rock reacts when blasted Burden = roughly 24 to 36 times the explosive diameter Using AN/FO at a specific gravity of g/cc i light rock g/cc density = 28 x diameter ii medium rock g/cc
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· Mining Engineering and Basic Knowledeg
Get PriceImportant Terms of Surface Mining Mining Terms Types of Mining Types of Mining Surface Mining Open Pit Mining Massive stock work deposits gold copper Strip Mining Bedded deposits coal phosphates Quarry Mining aggregates marble granite Placer Mining minerals in alluvium Gold Titanium Solution Mining For any mineral that is in or may be transported in a liquid
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ratio is reached in contour mining or in slot mining when surface access to a reserve is limited A significant attribute of the highwall miner is its versatility HWM has been used successfully to mine abandoned pre reclamation law highwalls points or ridges uneconomic to mine by underground or other surface methods outcrop barriers left adjacent to underground mines separate benches of
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Calculating Stripping Ratios for Area Strip Mines Mnge 315 ©Dr B C Paul spring 2003 revised 2010 Note These notes contain information considered common knowledge to those familiar with Strip Mining Books such as Elements of Practical Coal Mining and SME s Surface Mining were specifically referenced Stripping Ratio as a Fundamental • Ability to surface mine depends on
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· In order for surface mining to be economically feasible the ratio of waste material or overburden to oil sands ore must be relatively low As the oil sands deposit gets deeper below grade more and more overburden must be removed before the valuable oil sands Most mined oil sands deposits are located within 50 meters from the surface The strip ratio SR is the simplest measure of mining
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