general copper ore cut off grade

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Large Low Grade Copper-Gold Deposits: How Low Can …

 · 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. It also happens to mine some of the lowest copper grades in the world.

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Types of Copper Deposits in the World | Investing News …

The average grade of copper ores in the 21st century is below 0.6 percent copper, with the proportion of ore minerals being less than 2 percent of the total volume of the ore rock. Learn to profit ...

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Mining Valuation Lesson: Cut-Off Grade Theory and …

If you increase the cut-off grade, you decrease the life of the mine due to diminishing reserves (reserves are ore in a deposit that is economical to extract, see Mining 101: It's Not that Simple), but you would increase gold production due to the higher grade.

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Seabridge Reports Progress At Its KSM Project, But Higher ...

For example, at a C$36/tonne cut-off grade, the deposit Iron Cap contains indicated resources of 2.014 million toz gold, 556 million lb copper, 15.664 million toz silver, and 4 million lb ...

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Mineral Deposit Value – How to Calculate the Potential ...

However, in order to be as realistic as possible about this valuation, you can not assume that the complete ore body contains the same grade (i.e. 2% copper and 1.5 gram per tonne gold).

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THE EVALUATION OF A COPPER FLOTATION PLANT …

The evaluation of a copper flotation plant performance by plant survey and laboratory tests 97 In the plant mainly three different ore types (named as sulphide ore, complex ore

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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 with the exception of Kencana where USD $550 per ounce of gold is assumed. Mineral Resources, where

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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. COAKLEY GEOLOGY AND RESOU.RCES OF COPPER DEPOSITS

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Manganese Production Line - Mining Processing Machine ...

We supply the copper beneficiation plant including the magnetic separator, flotation machine, spiral chute, shaking table, rotary kiln and rotary dryer and so on. We can design the minerals upgrading solution for copper ore, gold ore, iron ore, manganese ore and other ores.

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12.3 Primary Copper Smelting

12.3 Primary Copper Smelting 12.3.1 General1 Copper ore is produced in 13 states. In 1989, Arizona produced 60 percent of the total U. S. ore. Fourteen domestic mines accounted for more than 95 percent of the 1.45 megagrams (Mg)

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Gold Assaying and Gold Grades - Investing News Network

The cut-off grade is the grade of material below which mining is uneconomic. Calculating the cut-off grade involves completing a mini- feasibility study in which all the known and potential costs ...

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

g– is the average grade of the ore above cut-off. In the limiting cases the following formulae apply for mining: for processing and for marketing Note the last two terms for the processing and marketing equations are identical in form and in each case the cut-off grade will fall as F declines because the remaining life of the mine is reduced. None of the formula makes direct reference to the ...

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

 · A cut-off grade for gold might be 0.13 oz/ton, depending upon the price of gold at the time. "copper equivalent" is a value given to an ore that consists of copper or other MINERALS, which when smelted, will give the producer a given amount of copper, ie. copper equivalent = 3%,,,,,or a combination of OTHER minerals that will give the same value expressed in 'copper value' or copper equivalent.

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Copper | Geoscience Australia

Increased block-cave ore production, higher grade ore and higher mill throughput all contributed to this increase. Adjacent to the eastern edge of the Cadia Hill orebody is the Cadia East deposit which is a porphyry zone of gold-copper mineralisation, extending up …

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Copper extraction - Wikipedia

The average grade of copper ores in the 21st century is below 0.6% copper, with a proportion of economic ore minerals (including copper) being less than 2% of the total volume of the ore rock. A key objective in the metallurgical treatment of any ore is the separation of ore …

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Cut-off grade estimation - QueensMineDesignWiki

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.

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Recent trends in mineral exploration - MinEx Consulting

–As a rule of thumb, lowering the cut-off grade by 50%, increases the ore tonnes by 4-8x and the contained metal by 2-4x –The cut-off grade is driven by economics .... which, in turn, are

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How to calculate grade and recovery concentrate?-Ore ...

In the mineral processing production, in addition to the general candidates and concentrate ore by measuring instruments directly know quality, intermediate products, direct measurement is difficult.

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AN APPROACH ON DILUTION AND ORE RECOVERY/ LOSS ...

an approach on dilution and ore recovery/ loss calculations in mineral reserve estimations at the cayeli mine, turkey a thesis submitted to the graduate school of natural and applied sciences

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Making the grade: understanding exploration results ...

As a rule of thumb, open pit mining can process ore for $10 per tonne and, where the ore grade is more than double that at $20 per tonne, results would be economic. Consider that 1% of a metric ...

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100 Years of Resource Growth for Copper - Impact of …

100 Years of Resource Growth for Copper - Impact of Costs, Grade and Technology 11,974 views. Share; Like ; Download ... This allowed companies to lower their cut-off grade – thereby expanding the available resource by a factor of six. The author argues that engineers and geologists acted as equal partners in growing the resource base over the last Century. Assuming that we continue to ...

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Using equivalent grade factors to find the optimum cut …

To do this, tonnage of ore in first year of mine life from the grade distribution intervals above optimum cut-off grades and tonnage of waste in first year of mine life from the grade distribution intervals below optimum cut-off grades was subtracted. These calculations are repeated until the end of mine life.

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THE IMPORTANCE OF DILUTION FACTOR FOR OPEN PIT …

The milling cut-off grade for this operation is calculated to be 0.30g/t. It means that a It means that a tonne of ore with 0.3g/t can be sent to the mill and be expected to generate a small amount of profit.

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DETERMINATION OF OPTIMAL MINING CUT-OFF GRADES ...

higher cut-off grades and processing higher grade ore sooner. Hence, the cut-off Hence, the cut-off grade optimization problem is viewed by Lane as a balancing act between

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Grade Tonnage Curve: How Far Can It Be Relied Upon?

face of variations of the cut-off grade. The grade tonnage curve is usually calculated with the in-situ resources or reserves and shows always the 'best' or 'optimistic' scenario, i.e., at a given cut-off grade …

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Copper - Specifications, Properties, Classifications and ...

Copper alloys are some of the most versatile materials. The combination of properties like strength, conductivity, corrosion resistance, machinability and ductility make copper suitable for many applications. The Specifications, Properties, Classifications and Classes are provided for copper alloys.

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Grade Tonnage Curve: How Far Can It Be Relied Upon?

face of variations of the cut-off grade. The grade tonnage curve is usually calculated with the in-situ resources or reserves and shows always the 'best' or 'optimistic' scenario, i.e., at a given cut-off grade …

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Part Four Competitiveness - Princeton University

Part Four Competitiveness ... change the cut-off grade (the lowest grade that is mined and treated). These are very important decisions in the operation of a mining project. They must be considered in the context of the prevailing copper price, the health of the firm, and the mine plan. Such actions ultimately affect the overall output of the mine and are therefore not undertaken capriciously ...

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HEAP LEACHING TECHNIQUE in MINING - Euromines

reserves and average grade (based on the "cut-off grade") of the ore. It should be borne in mind that lowering the cut-off grade of ores: increases asymptotically the quantity ore …

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Learning Goals: -What is an ore deposit? ona.edu

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

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