Products

Home > Products

general copper ore cut off grade

  • Cut-off grade estimation QueensMineDesignWiki

    Calculating The Cut-Off GradeMineral ClassificationAdjusting The Cut-Off GradeReferencesBreak-Even and InternalThe 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 parameteLane’s MethodLane's Method was presented by Ken Lane in 1988 when he identified three distinct stages of cut-off grade application; mining, concentrating, and processing. He related these steps to the concept of Net Present Value to create a method of cut-off grade determination that maximizes present value. Lane’s Polymetallic DepositsPolymetallic cut-off grade estimation is explained hereSee more on minewiki.engineering.queensu.ca
  • Copperstone Resources reports increased copper resources

    Dec 08, 2020· The substantial increases are despite the introduction of a 0.8% copper cut-off grade** and at an assumed future copper price of ~ 6,600 USD/ton (as used in the 2016 Scoping Study), conservativism

  • Author: Copperstone Resources AB
  • 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.

  • Location: The Recycling Centre, Griffin Lane, HP19 8BB, Aylesbury
  • 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.

  • 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

  • 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

  • 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

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

    Dec 04, 2011· While we have reduced the tonnage above the cut-off 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 cut-off grade reduces economic tonnage, but increases the overall 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

  • Understanding Grades of Copper Scrap ASM Metal Recycling

    The most valuable type of copper pipe clean copper tubing may qualify as #1 copper as long as it is free of fittings, insulation, paint, solder and other materials. In fact, most copper tubing and copper pipes can be of #1 grade providing they show few signs of corrosion and have their fittings removed.

  • Location: The Recycling Centre, Griffin Lane, HP19 8BB, Aylesbury
  • Copperstone Resources reports increased copper resources

    Dec 08, 2020· The substantial increases are despite the introduction of a 0.8% copper cut-off grade** and at an assumed future copper price of ~ 6,600 USD/ton (as used in the 2016 Scoping Study), conservativism

  • Author: Copperstone Resources AB
  • Cutoff grade Wikipedia

    Sep 17, 2010· 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.

  • Resources and Reserves Aeris Resources

    A cut-off grade of 1.2% copper is used to estimate Ore Reserve in the higher-grade lodes 102 and 108. A cutoff grade of 0.9% copper is used for the lower grade 101 and 105 lodes that are to be mined in retreat at end of mine life. The Murrawombie deposit has separate Ore Reserve estimates for underground mining; and open pit mining.

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

    Dec 04, 2011· While we have reduced the tonnage above the cut-off 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 cut-off grade reduces economic tonnage, but increases the overall grade.

  • 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).

  • Porphyry Copper & Grade MarketCap

    Operations commenced in 1905 on a reserve of about 40 million short tons at the then very low grade of 1.98% copper. Today the median copper grade for porphyry mines is around 0.5% and still falling. In conclusion it is important to note that grades are not declining because “all the best discoveries have been mined” and similar nonsense.

  • 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

  • Cut-off Grade Optimisation for a Bimetallic Deposit: A

    Copper is the main product while cobalt is a by-product. The life of Ruashi Mining is currently based on the external cut-off grade calculated during pit optimisation. This external cut-off grade is used to generate ore classes in the block model in preparation for scheduling in MineSched software. The ore classes are shown in Table 1.1 below.

  • 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

  • Learning Goals: -What is an ore deposit?

    6/1000*100=0.6% Typical mines today have ore grades of only 0.6 percent copper. Since metal concentrations occur at much lower grades, the copper concentrations are measured in parts per million (ppm). If a sample has 1ppm copper, this means that in 1 million lbs of rock, there is 1 lb of copper.

  • Mining Valuation Lesson: Cut-Off Grade Theory And Practice

    Dec 05, 2011· While we have reduced the tonnage above the cut-off by removing the uneconomical 6% of ore, the remaining average grade will have increased as the lower grade

  • Polymetallic deposit cut-off grade estimation

    A grade of 6, 3 and 0.5 percent by mass of zinc, lead and copper is used, respectively. Calculation of Cut-off Grade Using Net Smelter Return (NSR) Net Smelter Return is a measure of the value of ore and is defined as the proceeds from the sale of mineral products, after

  • mining part ii

    The cut-off gradeof 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.

  • 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.

  • Copperstone Resources reports increased copper resources

    Dec 08, 2020· The substantial increases are despite the introduction of a 0.8% copper cut-off grade** and at an assumed future copper price of ~ 6,600 USD/ton (as used in the 2016 Scoping Study), conservativism

  • Author: Copperstone Resources AB
  • 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.

  • 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.

  • Types of Copper Deposits in the World An Investor's

    Sep 09, 2020· For example, 1,000 kilograms of copper ore containing 300 kilograms of copper metal has a grade of 30 percent. When metal is at a much lower concentration, it

  • 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

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

    Sep 05, 2006· 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

  • 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

  • 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

  • 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-

  • 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.

  • 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.

  • 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

  • Part Three Resources and Technology

    to 0.8 percent copper ore. Those in the Philip-pines and Canada contain from 0.3 to 0.5 per-cent copper and from sO to 200 million tonnes of ore. Strata-bound deposits, the second most impor-tant in terms of metal reserves, are less common and smaller than porphyry deposits (1 million to 100 million tonnes of ore per deposit). Copper-

  • Copyright © 2004-2019 by SKD Machinery Technology Co. LTD All rights reserved.