general copper ore cut off grade

Cut-off grade estimation QueensMineDesignWiki

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

The lowest cut-off grade for milling is 0.18% copper equivalent, for crushed leach 0.12% and for ROM leach 0.05%. In 2012 the Paracatu mine, operated by Kinross Gold Corporation in Brazil, treated around 58 million tonnes of ore at a grade of around 0.4grams

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

May 16, 2018· In simple terms everything above the cut-off grade is ore, everything below is waste. In essence, it is the core determinate when defining an ore body. It will determine all of the critical parameters , such as the grade of the deposit, the size of the deposit and the amount of metal produced from the deposit.

Break Even Analysis How to Calculate the Cut Off Grade

For conducting a mining project’s break even analysis, you first need to know about the operational expenses (OPEX).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

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

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.

Mining Valuation Lesson: Cut-Off Grade Theory and Practice

Dec 04, 2011· 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.

Mining Cutoff Grades | Aussie Stock Forums

May 12, 2006· The grade of ore refers to the proportion of gold contained in the ore of a particular mine and is quoted in grams per tonne (g/t). The type of mine depends on the depth and grade of the ore. At a rough estimate, the larger, better quality South African underground operations are around 8-10g/t (Anglogold), while the marginal South African

Mineral Deposit Value How to Calculate the Potential

Average Grade: The concentration of a mineral in the ore body (i.e. % or g/t) 2% copper and 1.5 gram per tonne gold: Strike Length: The length in which the mineralization is found in the ore body (horizontally) 500 meters: Depth: The depth in which the mineralization is found in the ore body (vertically) 200 meters: Width

Cut-Off Grades For Mineral Resource Reporting: Going The

Cut-Off Grades For Mineral Resource Reporting: Going The Extra Rare Earth Mile 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).

Break Even Analysis How to Calculate the Cut Off Grade

For conducting a mining project’s break even analysis, you first need to know about the operational expenses (OPEX).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

Cut-Off Grades For Mineral Resource Reporting: Going The

Cut-Off Grades For Mineral Resource Reporting: Going The Extra Rare Earth Mile 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).

Cut Off Grade Calculation Optimization

Table of ContentsTraditional Cutoff Grades in Open Pit MiningHeuristic Cutoff Grade Optimization TechniquesOptimizing The Cutoff Grades By Lane’s 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

mining part ii

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.

Polymetallic deposit cut-off grade estimation

Mill (internal) Cut-off NSR. The mill cut-off NSR is described as the material that must be mined but can either be sent to the waste dump or processed as ore . The mill cut-off value is the difference between the mine operating cost and the mining cost.

Multi-mineral cut-off grade optimization by grid search

optimum cut-off grades for the equivalent variable can be found by using any of the established methods of single mineral cut-off grade optimization, e.g., Lane (1964, 1988), Dowd (1976). Operating cut-off grades for the equivalent grades do not necessarily correspond to achievable, or even meaningful, cut-off grades for the grade-tonnage distrib-

Ore grades and mining Google Docs

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.

What Does the Grade of a Gold Mine Refer To?

Feb 07, 2020· General Dictionary Economics Corporate Finance the grade of the ore, and how difficult it is to extract and distribute. "Cut-off grade estimation." Accessed May 8, 2020. World Bank.

Understanding Grades of Copper Scrap | ASM Metal Recycling

#2 copper is the third most valuable grade available. #1 Copper #1 copper is the second most profitable type to trade in. To be classified as #1, the copper should be comprised of bus bars, clippings, commutator segments and wire of at least 1/16th of an inch in diameter. It should also be clean in appearance, unalloyed and uncoated.

Porphyry Copper & Grade | MarketCap

At the time “low grade” referred to grades less than 2.5% copper and large was 10’s of millions of tons. This was the start of the porphyry era, which continues to this day. Bingham Canyon was the first low grade porphyry copper deposit off the rank. Operations commenced in 1905 on a reserve of about 40 million short tons at the then very

Mining Valuation Lesson: Cut-Off Grade Theory And Practice

Dec 05, 2011· In other words, the grade that provides the US$46 is the cut-off grade. Let's once again assume that the gold price is $1000 per ounce, which is equal to

2020 News | Ivanhoe Mines Ltd.

At a 3% cut-off, the new Mineral Resource estimate boosts the Kamoa Deposit’s Indicated Mineral Resource tonnages by 15% and contained copper by 15.5%, to a total of 256 million tonnes at a grade of 4.15% copper. At the same 3% cut-off, Kamoa’s Inferred Mineral Resources now total 13 million tonnes at a grade of 3.51% copper.

Making the grade: understanding exploration results

The Ivanhoe Mines Kakula deposit in the DRC has returned very high copper grades, including 11.91 metres (true width) of 6.23% copper at a 3.0% copper cut-off. GOLD: One ounce, or roughly 30 grams/tonne is high-grade and can be expected to move markets in most cases.

Learning Goals: -What is an ore deposit?

which will help you to decide where to drill. 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, what is the grade? 200/10000*100=2% 3.

Polymetallic deposit cut-off grade estimation

Mill (internal) Cut-off NSR. The mill cut-off NSR is described as the material that must be mined but can either be sent to the waste dump or processed as ore . The mill cut-off value is the difference between the mine operating cost and the mining cost.

Multi-mineral cut-off grade optimization by grid search

optimum cut-off grades for the equivalent variable can be found by using any of the established methods of single mineral cut-off grade optimization, e.g., Lane (1964, 1988), Dowd (1976). Operating cut-off grades for the equivalent grades do not necessarily correspond to achievable, or even meaningful, cut-off grades for the grade-tonnage distrib-

Learning Goals: -What is an ore deposit?

which will help you to decide where to drill. 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, what is the grade? 200/10000*100=2% 3.

cut off grade of iron ore

cut off grade of iron ore. Mining Valuation Lesson CutOff Grade Theory and Practice,Dec 04 2011 · While we have reduced the tonnage above the cutoff by removing the uneconomical 6 of ore the remaining average grade will have increased as the lower grade is no longer included That means that increasing the cutoff grade reduces economic tonnage but increases the overall grade...

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).

2020 News | Ivanhoe Mines Ltd.

At a 3% cut-off, the new Mineral Resource estimate boosts the Kamoa Deposit’s Indicated Mineral Resource tonnages by 15% and contained copper by 15.5%, to a total of 256 million tonnes at a grade of 4.15% copper. At the same 3% cut-off, Kamoa’s Inferred Mineral Resources now total 13 million tonnes at a grade of 3.51% copper.

Making the grade: understanding exploration results

The Ivanhoe Mines Kakula deposit in the DRC has returned very high copper grades, including 11.91 metres (true width) of 6.23% copper at a 3.0% copper cut-off. GOLD: One ounce, or roughly 30 grams/tonne is high-grade and can be expected to move markets in most cases.

Americas Gold And Silver Announces Significant Increase To

Sep 14, 2020· Mineral Resources are estimated at a 0.17g/tonne gold cut-off grade at Relief Canyon and are constrained by a $1,500 gold pseudoflow pit shell. Inferred Mineral Resources at Relief Canyon include

The world’s highest grade gold mines MINING.COM

Jul 16, 2015· In 2012, two barges carrying high-grade gold ore presumably from Avlayakan mine, capsized and sank in the Okhotsk Sea. With remarkable 18.2 g/t ore grade, this open-pit mine sits first in our ranking.

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

face of variations of the cut-off grade. In general, the The main economic metal present in the ore is copper and the mineralization can be described as being of the fissural or stockwork type. It is composed of veinlets and

100 Years of Resource Growth for Copper Impact of Costs

Nov 28, 2010· MinEx Consulting Strategic advice on mineral economics & exploration There is a trade-off between tonnes and grade Rio Blanco copper deposit 0% 2% 4% 6% 8% 10% 1 10 100 1000 10000 16 Grade (%Cu-equiv) Resource (million tonnes) Source: MinEx Consulting March 2010 1100 mt @ 0.58% Cu = 6.38 mt Cu 65 mt @ 1.26% Cu = 0.82 mt Cu Lowering the cut-off

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

History, production, and general geology of the Santa Barbara camp as known from published sources are briefly reviewed. A long known but previously unpublished spatial positioning of ore shoots in a district-scale dome is described, and comments on structural factors in ore pinchouts and ore quality are added.Ore pinchouts occur when the angle of intersection between a vein

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.

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