General Copper Ore Cut Off Grade

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

Cut-off grade estimation QueensMineDesignWiki

Understanding Cut-Off Grade 4 (Tonnage, Grade, and Costs

Feb 17, 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 • 174 Likes • 15 Comments

Determining the optimum cut-off grades in sulfide copper

The general principle of copper hydrometallurgical methods includes a solvent which . In this context, the cut-off grade defines the quantity of ore and waste, ensuring smooth supply of ore to

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

May 16, 2018· Still, it is better to have a higher than lower cut-off grade, as a higher cut-off grade will extend the life of the mine, and if there is a business case, capacity can be added. So using the example above, we can assume that 3.5g/t AuEq is the calculated minimum ore grade necessary to operate productively given all the geologic, environmental

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

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 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

Making the grade: understanding exploration results

Mar 24, 2017· 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

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).

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.

Decreasing Ore Grades in Global Metallic Mining: A

in grams per tonne, and the average ore grade can vary significantly from one mine to another. Usually open cut mines have lower grades, around 1 to 4 g/t, while underground mines can reach up to 8 to 10 g/t [36]. Mudd [6] estimated the average ore grade for Canada, Australia and South Africa as 7.15, 2.65 and 9.83 g/t respectively.

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

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.

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.

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.

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.

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

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.

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

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-

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 and bedding

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

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.

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

Solved: 18. Estimate The Unit Profit In Mining And Process

18. Estimate the unit profit in mining and processing a 0.80% copper ore deposit if the selling price of copper in concentrate is $1.73/kg and overall unit costs are $6.5/ton. Overall recovery is 82%. Calculate the cut-off grade of the copper deposit.

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.

Investegate ,Kefi Gold and Copper Announcements Kefi

VMS deposits are major sources of copper-lead-zinc-gold-silver ore bodies. Examples of large VMS deposits in the Arabian-Nubian Shield include: · Eritrea Mineral Resource Statement Parameters and Cut-off Grade. processing costs, general and administrative (G&A) costs, and other NSR factors. The final Resource NSR calculation is based

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.

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-

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.

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.

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 and bedding

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

Cut-off Grades for Mineral Resource Reporting Micon

Jul 13, 2016· 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.

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.

How To Separate Your Copper Scrap for Recycling

Apr 13, 2018· During the copper recycling process, it saves between 85-90% of energy resources as opposed to mining the earth for new copper ore. Worldwide supply of copper is about 8.1 trillion pounds, but we have only mined about 13.6% (1.1 trillion pounds) throughout history. Copper is a great conductor of electricity and can be found inside of wires 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