copper mining cut off

Overview | Copper Mountain Mining Corporation

Mineral Reserves are reported at an NSR cut-off value of $8.95/t for Little Eva and Turkey Creek, $9.35/t for Bedford and Blackard, $10.32/t for Lady Clayre and Scanlan, and $11.44/t for Ivy Ann. Mineral Reserves are reported using copper and gold prices of $2.75/lb and $1,250/oz, respectively. Average process recoveries of 95% for copper ...

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How copper''s mine-supply crunch is driving prices to ...

 · This, in turn, would suggest there is a growing appetite for copper raw materials. Talk of cuts could boosts prices On May 10, China''s Copper Smelting Purchasing Team (CSPT) - a group of 15 state-owned smelters - agreed to cut output by 300,000 tonnes.

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OPTIMIZING THE CUT OFF GRADE IN SARCHESHMEH COPPER …

Lane Algorithm is used to determine optimum cut off grade for a mining operation. There may be three parts in each operation: mining, concentration and refining. In Sarcheshmeh Copper Mine the concentrate coming from the stock has the average grade in addition to the production rate and cost. Therefore, the grade distribution is affected

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general copper ore cut off grade

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

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Copper con | GoldSeek

 · The report suggests the copper mining industry has gone as far as it can in lowering cut-off grades further, meaning it is no longer possible to add large amounts of reserves — especially given that porphyry deposits (from which 80% of global copper supply comes from) are typically low-grade, in the 0.3 to 0.4% Cu range.

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Copper con | Kitco News

 · The report suggests the copper mining industry has gone as far as it can in lowering cut-off grades further, meaning it is no longer possible to add large amounts of reserves — especially given that porphyry deposits (from which 80% of global copper supply comes from) are typically low-grade, in the 0.3 to 0.4% Cu range.

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Some observations on copper yields and ore grades ...

 · That tendency will be reinforced where existing mines are expanding, as their increased throughput typically entails lowering cut-off grades: higher output is accompanied by lowered head grades. This is a general phenomenon of the mining industry rather than a specific characteristic of copper mining (McCarthy, 2011).

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Cutoff grade optimization based on maximizing net present ...

 · In single-product and single-process mode, the optimum cut-off grade and the net present value of production are calculated for each year of the mine''s life. After validating the outputs of the model, the implementation of the computer model based on the data of Gol Gohar iron mine in a five-year plan was carried out.

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Break-Even Analysis

 · 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 ETFÂ 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).

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Updated Resource Estimate Confirms Pebble East as One of ...

Cut-offs in the range of 0.60% CuEQ, are typically used for bulk underground mining operations at copper porphyry deposits located around the world. Appropriate cut-offs for the Pebble Project''s open pit and underground resources will be defined during the pre-feasibility study planned during 2008.

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Maximizing the net present value by applying an optimal ...

Daniel Kržanović, Božo Kolonja and Dejan Stevanović: Maximizing the net present value by applying an optimal cut-off grade for long- term planning of the copper open pits 50 Fig. 1. Steps in planning per circular analysis [4]. When planning the mining of copper ore, the final result depends on …

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Cut Off Grade Calculation Optimization

 · Traditional Cutoff Grades in Open Pit Mining. Consider a hypothetical case study where an epithermal gold deposit will be mined by an open pit Table 1 gives the grade distribution of the material within the ultimate pit limits of this deposit. Table 2 gives assumed capacities and accepted costs to mine this deposit at 3000 tons/day milling rate.

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New bull chart for $30,000 copper price ...

 · Porphyries produce 80% of all copper but "the industry''s ability to increase its reserve base by lowering cut-off grades is nearing an end" says new study. New bull chart for $30,000 copper ...

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Ivanhoe Mines announces a 50% increase in Indicated ...

Initial mine development is planned to begin at the Kakula Deposit in a flat, near-surface zone along the deposit''s axis that, at a 3% cut-off, is between 7.1 metres and 11.7 metres thick, with copper grades of between 8.11% and 10.35%.

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

 · A Mining Valuation Lesson on Cut-Off Grade Theory and Practice. The world''s central banks have come together to help with the severity of Europe''s problems. Unemployment in the US fell to 8.6% – the lowest level in more than two and a half years. Markets soared with the biggest 3 …

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First Quantum Minerals Ltd.

 · The Mineral Reserve estimate is based on a copper equivalent cut-off grade of 0.59% CuEq using the long term consensus price of $3.00/lb for copper and a gold price of $1,200/oz. Low grade stockpiles are shown to be economic at the 0.59% CuEq cut-off grade. Hence these stockpiles continue to be considered as a part of the Mineral Reserve inventory.

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Copper Mining Cut Off

Copper Mining Cut Off Prompt : Caesar is a famous mining equipment manufacturer well-known both at home and abroad, major in producing stone crushing equipment, mineral separation equipment, limestone grinding equipment, etc.

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Ero Copper makes new high-grade copper discovery 200 meters

 · NSI indicates no significant intercept, based on a three meter mining width and a cut-off grade of 0.18% copper for regional exploration programs to demonstrate geological controls, irrespective ...

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Peak copper

 · Chile''s Escondida, the world''s largest copper mine, provides a good example of how lowering the cut-off grade has diminished the quantity and quality of its reserves. Between 2005 and 2012, the mine''s reserves grew from 32 million tonnes contained copper to over 54Mt, well exceeding the 8Mt of copper produced.

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Chapter 7 Energy Use in the Copper Industry

Pit Mines,"Engineering and Mining Journal, June 1987, pp. 76-80. 9See the discussion of comminutionin ch. 6. Table 7-3.—Effect of Varying Cut-off Gradea Cut-off gradeMillhead gradeTons milled Million Btu/ton cathode copper produced (% Cu) (% Cu) (x 10'') Mining Concentrating Refining Total 0.00 0.45 26.600 17.4 53.7 35.2 106.3

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On the Great Arizona Copper Strike, 1983-1986 | UAPress

 · In 1980 the price of copper fell from a high of $1.27 per pound to $0.83 per pound. Phelps Dodge began to reduce some of its mining operations to cut operating costs. In April 1982, with the price of copper falling to $0.69 per pound, Phelps Dodge suspended all mining, milling, and smelting operations, and laid off most of its workers.

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

 · Establishing a realistic cut-off cost will establish a realistic cut-off grade which will establish the tonnage and grade of the resources and reserves for the deposit or mine.

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Break Even Analysis

Cut-Off Grade (percentage per tonne) $ 33. $ 3. ($ 33 / $ 3 =) 11 pounds / tonne. ( (11 / 22) x 1% =) 0.50 percentage /tonne. Note: When the cost price per tonne can not be found in the mining company''s feasibility study, I kindly ask the mining company''s management to give me their best estimate. In order to be extra conservative in my ...

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Great Deposits – Alaska''s Pebble Copper-Gold Deposit ...

 · In addition, Pebble''s 0.3% Copper Equivalent cut-off was always the lower end of the grade spectrum and many of the stakeholders knew that such a low grade mine would have presented an economic risk with a potential bankruptcy and subsequent legal wrangling leaving site at risk for environmental degradation. Hence the project was never able ...

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Corriente Resources Inc. | Copper Assets | Deposits ...

The current block-model based, Inferred resource estimate, using at a 0.4% copper cut-off, is 600 million tonnes grading 0.59% copper, containing 7.7 billion pounds of copper. The next phase of drilling will attempt to expand the resources and convert the bulk of the Inferred resources to the Measured and Indicated categories.

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Rio strikes gold near likely new copper mine in WA

 · The maiden inferred mineral resource at the 100 per cent Rio-owned Winu project, reported at a 0.2 per cent copper equivalent cut off, is 503 million tonnes at 0.45 per cent copper equivalent (CuEq).

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2018 News | Ivanhoe Mines Ltd.

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

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OPTIMIZING THE CUT OFF GRADE IN SARCHESHMEH …

Lane Algorithm is used to determine optimum cut off grade for a mining operation. There may be three parts in each operation: mining, concentration and refining. In Sarcheshmeh Copper Mine the concentrate coming from the stock has the average grade in addition to the production rate and cost. Therefore, the grade distribution is affected

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Optimal mill cut-off grade modeling in the mineral ...

 · Cut-off grade play a critical role in defining tonnages mined and processed, average grade of mill feed, cash flows, mine life time, and all major characteristics of a mineral deposit. Simply, the cut-off grade is the lowest grade at which material is considered ore and is processed to create a concentrated commodity product. Essentially, it asserts that the mill cut-off grade is a function of ...

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Assessment of undergorund mining of Nussir copper deposit ...

The narrow steeply dipping strata bound sediment hosted copper deposit, Nussir, located in Kvalsund community, Finmark, Norway, have been subject to an assessment of underground mining. Resources classified as Indicated, within a 0,9%Cu cut-off limit have been identified as suitable for sublevel open stoping mining method, accessed by 590m long tunnel from fjord, a 2000m haulage tunnel in ...

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Minerals Inc.

2 Mineral reserves and resources are estimated using a minimum NSR cut-off of C$105 per tonne for waste filled mining areas and a minimum of C$116 per tonne for paste filled mining areas. 3 Metal prices of $1.10 per pound zinc, $1,500 per ounce gold, $3.10 per pound copper, and $18.00 per ounce silver with an exchange rate of 1.30 C$/US$ were ...

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Determining the optimum cut-off grades in sulfide copper ...

Optimum cut-off grades determination in mining life affects production planning and ultimate pit limit and it is also important from social, economical and environmental aspects. Calculation of optimum cut-off grades has been less considered for

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