cut off grade iin mining

  • Mineral Deposit Value How to Calculate the Potential

    To find out how I come up with the numbers 2 204.62262 and 34.2857 I recommend you to read the break even analysis page on which I explained How to Calculate the Cut Off Grade. 4. Convert the Pounds and Ounces to the Corresponding Metal Value

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  • What is cut off grade? An introduction to overlooked yet

    15/05/2018· A cut off grade is proposed and then the parameters of the deposit are calculated and tested against economic scenarios. If it fails the process is started again with a different cut off grade. In some cases it may never work. In summary cut off grade is one of the most important yet least understood variables for making an investment

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  • Mining Valuation Lesson Cut Off Grade Theory And Practice

    5/12/2011· Yet it is an extremely important factor in mining valuations. Cut off Grade Theory and Practice. Consider a block of ore that weighs 1 tonne and contains 3 grams of gold. At a

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  • Cutoff

    Cutoff frequency in telecommunications and digital signal processing; Cutoff grade in mining the level of mineral in an ore below which it is not economically feasible to mine it; Cutoff voltage the voltage at which a battery is considered fully discharged; Fuse (electrical) (or cutoff) a type of overcurrent protection device

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  • The choice of the cutoff grade in mining ScienceDirect

    The choice of the cutoff grade in mining influences the profitability and life of individual mines and thereby the quantity of a resource that is available to society. It is of such importance that it has been subject to regulation most notably in South African gold mining. Though a major pre occupation of engineers it is the subject of only

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  • 2007 MINERAL RESOURCE ORE RESERVE EXPLANTATORY NOTES

    The resource model is reported on a zero profit cut off based on $600 per ounce gold and $1.60 per pound copper and current long term mining cost assumptions. While the resource grade model is unchanged from the 2006 statement there has been a small change to the recovery and financial variables used for the value

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  • Cut off grade estimation QueensMineDesignWiki

    4/12/2011· A mining valuation lesson on cut off grade theory and practice. Applying the theory of cut off grade to a gold mine to see how it affects mine life and more

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  • Cut off grades and optimizing the strategic mine plan

    Cut off grades and optimizing the strategic mine plan At a time when the mining industry is reviewing its performance and approach in delivering value to shareholders this book provides the intellectual tools needed by mine managers in order to turn what their directors are promising into reality. Too often good intentions at a board level do not translate into appropriate actions by

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  • Using Geostatistics to Estimate the Resources of a Narrow

    Cut off grades were considered by calculating grade tonnage curves (see Section 5.0 for more information). One grade tonnage curve showing resources above cut off and average grade versus cut off grade was calculated for several lower limits of confidence 40 % 50 % 60 % 70 % 80 % and 90 %. The data that was used to construct the 50 %

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  • Excel Calculation For Cut off Grade mining

    Excel Calculation For Cut off Grade (self.mining) submitted 2 years ago by dr guy1 Hi Working on a project and need a download or excel sheet to do a calculation similar to Lang in 1988 or subsequent work by other authors.

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  • Dynamic optimization of cutoff grade in underground metal

    24/06/2010· That is cutoff grade selection must be dynamic with respect to both time and space. A newly developed method that fulfills these requirements is presented. In this method the deposit or a portion of it under study is divided into decision units based on the mining method and sample data. The statistical grade distribution and the grade

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  • Understanding Cut Off Grade 5 (Incremental Ore) or Why is

    26/03/2018· This is the fifth in a series of articles I've been writing on cut off grade. Selection of an appropriate cut off grade is the most important and fundamental driver of economic value for any

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  • Cut Off Grades For Mineral Resource Reporting SRK

    Cut off grades for mineral resource reporting going the extra rare earth mile. Resource Geologists are geologists who can value the basic underlying economic attractiveness of a mineral deposit. This means knowing the costs and practicalities of mining and processing for a particular product. A cut off grade (COG) is an industry accepted standard expression used to determine what part of a

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  • OPTIMIZING THE CUT OFF GRADE IN SARCHESHMEH COPPER MINE

    J o u r n a l o f Journal of Mining and Metallurgy 52 A (1) (2016) 27 35 #Corresponding author Maleki@eng.ikiu.ac.ir OPTIMIZING THE CUT OFF GRADE IN SARCHESHMEH COPPER MINE USING LANE QUARTET MODEL

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  • Mine cutoff grade Britannica

    In mining Delineation. This is called the mine cutoff grade. And if the material has already been mined there is a certain grade below which it is not profitable to process it; this is the mill cutoff grade. The grade at which the costs associated with mining and mineral processing just equal Read More

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  • Break Even Analysis How to Calculate the Cut Off Grade

    For conducting a mining projects break even analysis you first need to know about the operational expenses (OPEX). When the OPEX is known you can calculate the minerals cut off grade which is the break even grade below which it is not economically viable to mine the ore. To find out how I come up with the cost price per tonne (OPEX

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  • Large Low Grade Copper Gold Deposits How Low Can Grade

    5/03/2013· Cut off grade is perhaps the simplest way to understand the economics of large low grade mining operations. This is the grade above which a particular mine is profitable. Freeport McMoRan Copper Gold Inc. is the worlds largest listed copper producer. It has operations in the Americas Indonesia and Africa. It also happens to mine some

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  • Cut off Grade Analysis Improving the Economics of Low

    30/05/2016· In this video Anoush Ebrahimi PhD explains why understanding grade distribution is the key to successfully managing capital and operating costs for a mining project.

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  • THE IMPORTANCE OF DILUTION FACTOR FOR OPEN PIT MINING

    grade means lower mill recovery. Dilution also increases the cut off grade which in turn reduces the overall ore utilization of a mine. In some cases to take advantage of economies of scale mining operations tend to plan for higher mining rates. Moving to a larger scale of operation means less selectivity hence more dilution. This is true

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  • Determination of optimal cut off grade SAIMM

    d is the discount rate NPVi is the NPV of the future cash flows of the years (i) to the end mine life N and the C is thetotal milling capacity in Year i. The cut off grade gm (i) depends on the NPVi and NPVi cannot be determined until the optimum cut off grades have been decided. The

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  • Break even is broken AusIMM Bulletin

    Why the use of the break even cut off grade is flawed and how it poses a fundamental problem for the mining industry Sometimes what we are taught is not right anymore (if it ever was) The lead authors father was taught at school that the nucleus of an atom was the smallest indivisible piece

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  • Introduction to Cut off Grade Estimation (2nd Edition

    Introduction to Cut off Grade Estimation (2nd Edition) Details. This book examines one of the most important calculations in the mining industry. Cut off grades are essential to determining the economic feasibility and mine life of a project. Profitability and socioeconomic impact of mining operations are influenced by the choice of cut off grades. Cut off grades play a key

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  • Mineral Deposit Value How to Calculate the Potential

    To find out how I come up with the numbers 2 204.62262 and 34.2857 I recommend you to read the break even analysis page on which I explained How to Calculate the Cut Off Grade. 4. Convert the Pounds and Ounces to the Corresponding Metal Value

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  • Mill cutoff grade Britannica

    Other articles where Mill cutoff grade is discussed mining Delineation process it; this is the mill cutoff grade. The grade at which the costs associated with mining and mineral processing just equal the revenues is called the break even grade. Material having a higher grade than this would be considered ore and anything below that would be waste.

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  • Understanding Cut Off Grade 4 (Tonnage Grade and Costs

    17/02/2018· Understanding Cut Off Grade 4 (Tonnage Grade and Costs) or Why is my mine losing money? Published on February 17 2018 February 17 2018 166 Likes 14 Comments

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  • Cut off grade determination for the maximum value of a

    mine with an average grade of 6 g/t Au and a logrithmic variance of 1.2 are applied to the model to illustrate the benefits of representing cut off grades in terms of present value curves for different segments of a mining operation. Keywords cut off grade Net Present Value grade tonnage curve balancing cut off grade mining processing

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  • Cutoff grade

    Cut Off grade is the minimum grade required in order for a mineral or metal to be economically mined (or processed). Material found to be above this grade is considered to be ore while material below this grade is considered to be waste.. The cut off grade can be determined through a variety of methods each of varying complexity.

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  • Cut Off Grade Calculation Optimization

    Table of ContentsTraditional Cutoff Grades in Open Pit MiningHeuristic Cutoff Grade Optimization TechniquesOptimizing The Cutoff Grades By Lanes ApproachAlgorithm for Determining Optimum Cutoff Grades Cutoff grade is defined as the grade that is normally used to discriminate between ore and waste within a given orebody. Although the definition of cutoff grade is very precise the choice of

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  • Making the grade understanding exploration mining

    24/03/2017· The most exciting news from a mining exploration stock is a high grade drilling result. But what constitutes a good assay? It varies from situation to situation and commodity to commodity. Listed

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  • 2018 News Ivanhoe Mines Ltd.

    Kakulas new Indicated Mineral Resources at a 3% cut off grade have increased by 58 million tonnes and currently total 174 million tonnes at a grade of 5.62% copper. This compares to the May 2017 estimate of 116 million tonnes at 6.09% copper at the same cut off grade. Estimated Inferred Mineral Resources now total an additional nine million

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  • Large Low Grade Copper Gold Deposits How Low Can Grade

    5/03/2013· Cut off grade is perhaps the simplest way to understand the economics of large low grade mining operations. This is the grade above which a particular mine is profitable. Freeport McMoRan Copper Gold Inc. is the worlds largest listed copper producer. It has operations in the Americas Indonesia and Africa. It also happens to mine some

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  • OPTIMIZING THE CUT OFF GRADE IN SARCHESHMEH COPPER MINE

    J o u r n a l o f Journal of Mining and Metallurgy 52 A (1) (2016) 27 35 #Corresponding author Maleki@eng.ikiu.ac.ir OPTIMIZING THE CUT OFF GRADE IN SARCHESHMEH COPPER MINE USING LANE QUARTET MODEL

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  • Cut Off Grades For Mineral Resource Reporting SRK

    This means knowing the costs and practicalities of mining and processing for a particular product. A cut off grade (COG) is an industry accepted standard expression used to determine what part of a mineral deposit to include in a mineral resource estimate (MRE). For MRE reporting COGs tend to be rounded down to ensure that material of no

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  • Cut off Grade Optimisation Feb 07 Whittle Consulting

    Cut off Grade Optimisation Gerald Whittle and Jeff Whittle Feb 07. Intro Whilst processing all material above the marginal cut off grade will maximise cash flow over the life of the operation if the time value of money is taken into account then a different strategy is warranted. The following discussion seeks to explain the mechanisms that are

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  • Mining Cutoff Grades Aussie Stock Forums

    12/05/2006· A cut off grade defines what you will mine for a profit. It will vary for every mineral for every location and reflect geological conditions and prevailing metals prices. For example you can mine surface gold grading much less than a gram per tonne and make a profit but you would not touch 2 grams per tonne a few kilometres down because it would be too expensive. As the prevailing metal

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  • Break Even Analysis How to Calculate the Cut Off Grade

    This article about how to calculate the cut off grade is a great resource for investors in individual mining stocks. However when you are investing in mining stocks through a Stock Based mineral ETF I recommend you to read this article too.. For conducting a mining project's break even analysis you first need to know about the operational expenses (OPEX).

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  • The choice of the cutoff grade in mining ScienceDirect

    The choice of the cutoff grade in mining influences the profitability and life of individual mines and thereby the quantity of a resource that is available to society. It is of such importance that it has been subject to regulation most notably in South African gold mining. Though a major pre occupation of engineers it is the subject of only

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  • » Cut off Grades for Mineral Resource Reporting

    Some reasonable cut off grade needs to be applied to the mineral inventory prior to reporting them as mineral resources. A table or chart of sensitivity to cut off grade may be supplied but zero or near zero cut off grades may not be reported in most cases. The methods of determining cut off grade can vary particularly for open pit deposits.

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  • Mining Operation PorgeraJV

    Lower grade ore material that is not fed directly to the mill is stockpiled depending on cut off grade applied. If the gold grades available in the Pit are lower than the stockpile grades or if there is a shortage of direct feed ore these stockpiles are recovered and fed to the mill.

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