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Break Even Analysis How to Calculate the Cut Off

When the OPEX is known, you can calculate the mineral’s 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) if a feasibility study isn’t available, I refer you to the note at the bottom of this page.

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Cut-off grade estimation QueensMineDesignWiki

Calculating The Cut-Off GradeMineral ClassificationAdjusting The Cut-Off GradeReferencesThe most simplistic way to determine cut-off grade is through the break-even and internal method. This method is easy to use and involves minimal background information. It is preferred as a first estimate, and is most effective in the early planning phases of a project. Although the limited number of parameters makes this method a good first step, it is not ideal to use this method in the long term, since it does not take production capacity or discount rates into consideration.The internal...

Cut Off Grade Calculation Optimization

2020-3-7  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 a cutoff grade policy to be used during an exploitation of a deposit is not.

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Mining Valuation Lesson: Cut-Off Grade Theory And

Mining Valuation Lesson: Cut-Off Grade Theory And Practice. Cut-off Grade Theory and Practice. While we have reduced the tonnage above the cut-off by removing the uneconomical 6% of ore

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Cut-off grade determination for the maximum value of a

2009-8-26  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

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Mining Valuation Lesson: Cut-Off Grade Theory and

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.

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Large Low Grade Copper-Gold Deposits: How Low

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 CopperGold Inc. is the world’s largest, listed copper producer. It

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Cut-Off Grades For Mineral Resource Reporting SRK

2020-3-4  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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Understanding Cut-Off Grade 4 (Tonnage, Grade, and

2018-2-17  We have seen from the previous articles, that comparing the net equivalent recovered grade to an economic cut-off grade is simply a proxy for comparing the value of a block of ore to the cost of

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pdfs.semanticscholar

2017-5-25  pdfs.semanticscholar

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Professional Development Courses ROBUST STRATEGIC

2019-12-29  Professional Development Courses ROBUST STRATEGIC MINE PLANNING OPTIMIZATION GEOVIA WHITTLE AND SIMULIA ISIGHT Day 4 Whittle Lab07 Cut-off Grade Optimization Cut-off Optimization Lane’s Theory Cut-off Optimization Maximizing Profit o Mining, mill, and market limited cut-offs

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Determination of optimum cut-off grade of an open

Raising the cut-off grade will decrease the proportion of the deposit treated as ore while the average grade of the ore will increase. In a given open-pit mine design, all material within the pit limits must be extracted . By increasing cut-off grade the fraction of waste material is also increased.

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Mineral Deposit Value How to Calculate the

The concentration of a mineral in the ore body (i.e. % or g/t) 2% copper and 1.5 gram per tonne gold: on which I explained How to Calculate the Cut Off Grade. 4. Convert the Pounds and Ounces to the Corresponding Metal Value. 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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Gold Assaying and Gold Grades investingnews

The cut-off grade is a dynamic number, and adjustments routinely happen, most commonly in response to a change in the market price of a metal. The larger the average grade is in relation to the

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Part Three Resources and Technology Princeton University

1996-11-20  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

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Structural factors in ore position, quality, and cut-off

Structural factors in ore position, quality, and cut-off grades in fissure veins at Santa Barbara, Chihuahua, Mexico the presence alone or together of either of two distinct types of ore mineralization--a lead-silver type and a deeper copper-gold-silver type.The Cabras and Bronces ore shoots are described. The bonanza grade and tonnage

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12.3 Primary Copper Smelting

2015-9-10  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, and some iron is converted to iron oxide.

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

2001-8-9  Grade Tonnage Curve: How Far Can It Be Relied Upon? 6 Sequential simulation is the most popular algorithm to generate simulated images given its simplicity of implementation (Deutch and Journel, 1998; Silva and Soares, 2000). In this stone a recent developed algorithm of Direct Sequential Simulation (Soares, 2001) was applied.

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Cutoff grade optimization based on maximizing net

Otherwise, by deducting the tonnage of the ore mined from the higher-grade fine ranges, the optimum cut-off grade and the fractionation of the waste ore from the sub-optimum, the amount of tonnage of the mineral input to the processing plant is calculated. For each year, the tonnage must be recalculated for each of the brightness ranges.

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Updated independently verified Indicated Mineral

2020-2-5  Updated independently verified Indicated Mineral Resource again increases the Kamoa Copper Discovery to 256 million tonnes grading 4.15% copper, at a 3% cut-off

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Geology of Porphyry Copper Deposits

2020-2-29  Here let’s understand the geology of porphyries and iron oxide copper gold deposits or IOCG as they are known. 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

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Katanga Mining Provides an Update on Major Projects

2020-3-6  (that contains copper under the copper cut-off grade but cobalt over the cobalt cut-off grade). The primary ore component is defined as having a Cu grade of greater than 1.25% and the low-grade

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Frieda River Copper-Gold Project Ore Reserve update

2018-12-10  selected as ore. The cut-off value used to define the Ore Reserve was applied on a net smelter return (NSR) basis which incorporates realisation costs, metallurgical recovery, ore processing and general and administrative costs. The breakeven NSR differentiates ore from waste rock on a static unscheduled basis.

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The Ore Grade and Depth Influence on Copper Energy

The study evaluated implications of different ore grades and mine-depth on the energy inputs to extract and process copper. Based on a 191 value dataset from 28 copper mining operations, seven model equations explaining operational energy costs were statistically evaluated. Energy costs for copper mines with leaching operations were not found to be significantly affected by ore grades nor mine

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What Does the Grade of a Gold Mine Refer To?

2015-8-13  When gold ore has a high grade, it takes relatively less effort to extract an ounce of gold from the ground and, since less ore has to be dug out, it reduces the input costs for the gold mining

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What Tools Can Be Used to Cut Copper Hunker

General Home Repair; it is easier to get into confined spaces to cut previously-installed copper pipes. As is the case with all copper pipe cutting, the water supply is turned off first before cutting commences. Also, if the pipes are to be reused, the angle of the cut must

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1.1 PHASES OF A MINING PROJECT elaw

2019-2-4  quantities of high-grade mineral ore deposits. 1.1.2 Development If the mineral ore exploration phase proves that there is a large enough mineral ore deposit, of sufficient grade, then the project proponent may begin to plan for the development of the mine. This phase of the mining project has several distinct components.

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Chapter 7 Energy Use in the Copper Industry

1996-11-20  much ore is milled or waste is available for dump leaching operations, and 3) from the ore that is milled, how much copper is recovered and what volume of tailings is produced (see table 7-3). The stripping ratio also affects where and in what form energy is consumed, because it de-6As disusscdIn ch 5, the cut-off grade IS the mineral valuethat

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FEASIBILITY STUDY CONFIRMS OUTSTANDING PROJECT

2019-3-27  The T3 Copper Project Feasibility Study is modelled on theT3 Ore Reserve as announced on 25 March 2019. will reduce to an average of 2 to 1 and mining costs should follow this general downward trend (Figure 7). Copper Grade 1.0% Copper cut-off grade 0.22% Silver Grade 13.2g/t

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Integrated Operations Operations SCC Southern

2020-3-7  Lists: Quick Launch

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