general copper ore cut off grade

  • Making the grade: understanding exploration results ...

    Mar 24, 2017· Making the grade: understanding exploration results. Resource World ... where the ore grade is more than double that at $20 per tonne, results would be economic. ... of 6.23% copper …

  • Decreasing Ore Grades in Global Metallic Mining: A ...

    Decreasing Ore Grades in Global Metallic Mining: A Theoretical Issue or a Global Reality? Guiomar Calvo 1,*, Gavin Mudd 2, ... the study has shown that the average copper ore grade is decreasing over time, while the ... Copper is currently mined using both underground and open cut …

  • Part Four Competitiveness - Princeton University

    Part Four Competitiveness ... ore than the net tonnage of copper in the ore.5 A tonne of lean ore requires no more capital, energy, labor, and supplies to mine than a tonne ... change the cut-off grade (the lowest grade that is mined and treated). These are …

  • Cutoff grade - Wikipedia

    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.

  • Determination of optimum cutoff grades of multiple metal ...

    Other methods for discrimination of ore/waste in multiple metal deposits are: Critical level method, Net Smelter Revenue (NSR) method, Single grade cutoff approach, Dollar value cutoff approach (Annels 1991;Barid and Satchwell 2001). None of these methods is an optimized technique, because the distribution of grade of mined material, mining ...

  • Learning Goals: -What is an ore deposit? - geo.arizona.edu

    Learning Goals: -What is an ore deposit? -What is a porphyry copper deposit? ... Copper grade is the concentration of copper in the ore rock. To calculate the grade of copper for the sample, geologists use the equation: (amount of copper metal/amount of copper ore rock)*100 2. If a deposit area has 200lbs of copper in 10,000lbs of ore rock ...

  • THE IMPORTANCE OF DILUTION FACTOR FOR OPEN PIT …

    THE IMPORTANCE OF DILUTION FACTOR FOR OPEN PIT MINING PROJECTS* Anoush Ebrahimi, P. Eng., Ph.D. ... Dilution also increases the cut-off grade which in turn reduces the overall ore utilization of a mine. ... in copper grade may result in a 60% change in the net present value (NPV) of …

  • Mining Valuation Lesson: Cut-Off Grade Theory and Practice ...

    That means that the higher the cut-off grade, there is even a possibility that the NPV would be negative as the mine life and recoverable ore becomes too small. The important factor is selecting the cut-off grade that yields the highest NPV. In our table, that means selecting the 2.5 grams per tonne cut-off grade.

  • 2007 MINERAL RESOURCE & ORE RESERVE …

    2007 MINERAL RESOURCE & ORE RESERVE EXPLANTATORY NOTES . ... Cut-off grade calculations assume metal prices of $600 per ounce of gold and $1.60 per pound of copper ... defined by gold and copper grade, mineralized quartz content and copper mineralogy, were used to control

  • 100 Years of Resource Growth for Copper - Impact of Costs ...

    Nov 28, 2010· 100 Years of Resource Growth for Copper - Impact of Costs, Grade and Technology 1. MinEx Consulting Strategic advice on mineral economics & exploration The key drivers behind resource growth: an analysis of the copper industry over the last 100 years Richard Schodde Managing Director, MinEx Consulting 2010 MEMS Conference Mineral and Metal Markets over the Long Term Joint …

  • mining part ii - d32ogoqmya1dw8.cloudfront.net

    The cut-off grade of an ore is essentially the lowest grade of an ore that is worth mining. If the ore grade is less than the cut-off grade, then a mining company will not make money mining that ore. According to Fellows (2010), the cut-off grade of an ore is one of the main factors in determining the economics of the mine.

  • The world's top 10 highest-grade copper mines | MINING.com

    Feb 19, 2017· While the copper market is gaining momentum, it is a good time to look at the copper mining champions in terms of copper grade in ore reserves.

  • DETERMINATION OF OPTIMAL MINING CUT-OFF GRADES ...

    MATHEMATICAL FORMULATON AND SOLUTION ALGORITHM ... off grade of say 1% Cu in an open pit copper mine means that any material ... higher cut-off grades and processing higher grade ore …

  • Cut-Off Grades For Mineral Resource Reporting | SRK

    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 economic significance is excluded from the resource.

  • Cut-off grade determination for the maximum value of a ...

    operations and the relationship between cut-off grade and NPV provides a means by which cut-off grades can be optimized. For the purposes of a discounted cash flow analysis Lane defined value as a function of two factors, namely the size of the remaining ore reserve (S) and the rate of extraction (q). Intuitively these two factors will inform

  • In mining, what do you mean when you say "cut-off grade ...

    Sep 05, 2006· Best Answer: Assay results are the actual results of analysis of 'ore' samples that will tell you, for instance if you have ONE ounce of Gold per Ton of ore, or one-half oz. of silver, or 2% copper. These tests are reliable, reproducible, and determine if a given 'ore' is actually commercially viable to mine or not. 'cut-off' grade is the grade at which it is not feasible or economical to mine ...

  • The Nature and Use of Copper Reserve and Resource Data

    THE NATURE AND USE OF COPPER RESERVE AND RESOURCE DATA By DENNIS P. Cox, NANCY A. WRIGHT, and GEORGE J. COAKLEY1 ABSTRACT Copper reserve, resource, and production data can be combined to produce disaggregated resource estimates and trends and, when com­ bined with demand forecasts, can be used to predict future explora­

  • Mine cutoff grade | Britannica.com

    Other articles where Mine cutoff grade is discussed: 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…

  • 12.3 Primary Copper Smelting

    charge material of copper concentrate mixed with a siliceous flux (often a low-grade copper ore) is heated in air to about 650°C (1200°F), eliminating 20 to 50 percent of the sulfur as sulfur dioxide (SO2). Portions of impurities such as antimony, arsenic, and lead are driven off…

  • Ivanhoe Mines: The New Ultra High-Grade Copper Discovery ...

    Feb 04, 2019· Now our immediate exploration focus is to find more of this near-surface, bonanza-grade ore. Only for comparison, DD1450 intersected 22.3 meters grading 13.05% copper at a 2% copper cut-off grade.

  • SPENCE BRIEFING - BHP

    SPENCE BRIEFING SPENCE BRIEFING 0.88% acid soluble copper, and 231 million tonnes of heap leach sulphide ore at a grade of 1.13% total copper, both at a total copper cut-off of 0.3%. The break down of proven and probable ore reserve categories is …

  • OPTIMIZING THE CUT OFF GRADE IN SARCHESHMEH …

    technical and economical data of different parts to determine the cut off grade. The result of the model was a cut off grade of (0.1408%), which brings about an increase of 848051645 US dollars as profit, in comparison to the cut off grade (0.1617%) that was obtained by the Lane tripartite model.

  • Some observations on copper yields and ore grades ...

    Some observations on copper yields and ore grades. Author links open ... more than offset the higher costs of mining lower grade ores and held down the price of copper metal relative to the general price level for extended periods. ... Such increases in scale may be accompanied by changes in cut-off grade, the boundary between ore that is ...

  • Geology of Porphyry Copper Deposits

    These are somewhat the giants of the ore deposits world. As a mining interested learner, the geology of porphyry copper deposits is vital to your education. Now in the first Exploration Geology Course I discussed how because our current mining technology all the metals that we use are mined from the top 4 km of the earth's crust. I also ...

  • Types of Copper Deposits in the World | Investing News Network

    Types of Copper Deposits in the World. ... with copper, grade is the common convention. Grade is a significant factor in how much a deposit is worth. ... Currently the most common source of copper ...

  • Part Three Resources and Technology - Princeton University

    Part Three Resources and Technology, Chapter 5 World Copper Resources, ... and the copper content (or ore grade) of current mine production. The relations be-tween ore grades, tonnages, and production costs ... (Washington, DC: U.S. Government Printing Off Ice, January 1985) COPPER RESOURCES AND RESERVES A general classification for describing ...

  • Using equivalent grade factors to find the optimum cut-off ...

    He defined cut-off grade as "any grade that, for any specific reason, is used to separate two courses of action, e.g. to mine or to leave, to mill or to dump …" (Taylor, 1972, Taylor, 1985). Most researchers have used break-even cut-off grade criteria to define ore as a …

  • Mining Cutoff Grades | Aussie Stock Forums

    May 12, 2006· As the prevailing metal prices rise, the cost of extracing metals from lower grade ore bodies becomes less of an issue. As a result, copper mines that were once too expensive are now being opened up, while nickel ore bodies that would never be touched at …

  • 1.1 PHASES OF A MINING PROJECT - Home | ELAW

    1.1 PHASES OF A MINING PROJECT There are different phases of a mining project, ... especially if access roads cut through ecologically 1. ... For example, the copper content of a good grade copper ore may be only one quarter of one percent. The gold content of a good grade

  • Cut-off grade estimation - QueensMineDesignWiki

    Mar 05, 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 world's largest, listed copper producer. It has operations in the America's, Indonesia and Africa.

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