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Types of Copper Deposits in the World An

09.09.2020  Exploration companies estimate grade through drilling and assaying. The average grade of copper ores in the 21st century is below 0.6 percent copper, with the proportion of ore minerals being less...

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The ten highest-grade copper mines in the world

The amount of copper to be found in a mine is important, but what is also central is the grade of copper. Generally speaking, the higher the grade of copper available, the more profitable it is to mine. How is this calculated? Well, grade is just another way of talking about the weight of copper. For example, if you mine 1 000 kilograms of rock, and 30 kilograms is made up of copper, then the average grade would be 3%. The global average grade of copper ores today is about 0.6%

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The world’s top 10 highest-grade copper mines -

20.02.2017  Antas is a high-grade, low-cost copper mine with gold byproduct credits and significant exploration potential. 2.5% copper grade in reserves puts this mine fifth on the list. 1. Sudbury

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Mineral Deposit Value - How to Calculate the

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

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Some observations on copper yields and ore

The average copper content of ore deposits is usually below the average yield of the ore accessed in the early years of production. The initial grades of new mines have not declined over the past forty years, and there has been no perceptible tendency for the average grade of porphyry deposits brought into production to decline over time. There is no apparent correlation between average grade and deposit size, but mine operators tend to exploit economies of scale to offset low grades

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Decreasing Ore Grades in Global Metallic Mining:

At present, the global average copper ore grades for copper mines is approximately 0.62% of Cu content [ 17] and this number is expected to decrease as mines with higher ore grades become exhausted [ 17, 18, 19 ].

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Making the grade: understanding exploration ... -

COPPER: Anything over 100 metres and 1% copper equivalent or better is considered to be high-grade. For example, Serengeti Resources announced 119.6 metres of 0.9% copper equivalent (copper plus...

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Some observations on copper yields and ore

01.03.2012  The tendency for grades to fall from the averages of the early years of production is illustrated for a wider range of mines in Fig. 4 which shows index numbers of the head grades (the percentage copper content of ore milled) at successive five yearly dates from initial production. For each mine the average of the first four years' grades is taken as 100.

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Calculation of Ore Tonnage Grade from Drill

43° 8′ being the angle at hole 4. Each of the other holes is treated in the same way and the corrected products are used in determining the average grade of the prism. In Fig. 3, this method gives the content of the trapezoid as 50,515.59 metric tons of copper or an assay value of 1.630 per cent, copper. In Fig. 4, this method gives the trapezoid a content of 48,250.35 metric tons of copper, or an average grade

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Some observations on copper yields and ore

01.03.2012  The tendency for grades to fall from the averages of the early years of production is illustrated for a wider range of mines in Fig. 4 which shows index numbers of the head grades (the percentage copper content of ore milled) at successive five yearly dates from initial production. For each mine the average of the first four years' grades is taken as 100.

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Some observations on copper yields and ore

The average copper content of ore deposits is usually below the average yield of the ore accessed in the early years of production. The initial grades of new mines have not declined over the past forty years, and there has been no perceptible tendency for the average grade of porphyry deposits brought into production to decline over time. There is no apparent correlation between average grade and deposit

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Decreasing Ore Grades in Global Metallic

According to Cox and Singer , the average copper ore grade in the mine (x m) was 1.67% around 1990 and in the case of the 25 copper mines analyzed, the average ore grade is 1.48%. These selected mines produced more than 5 million tons in 2009, which corresponded to 32% of the total world production that same year [ 42 ].

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Bingham Canyon, Copper Mine, Utah, USA -

As of December 2019, the mine had 612Mt of Cu, 612Mt of Au, 612Mt of Ag, 612Mt of Mo in the proven and probable reserves category totalled 524Mt grading 0.43% Cu, 0.16g/t Au, 2.04g/t Ag, and 0.03% Mo.

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Some Observations on Copper Yields and Ore

On the basis of the equation, an ore grade of 0.5, 0.4 and 0.3% at 300 m of depth results in an energy cost of 60, 127 and 447 MJ/kg to obtain a 30%+ copper concentrate from underground mines, and ...

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Calculation of Ore Tonnage Grade from Drill

43° 8′ being the angle at hole 4. Each of the other holes is treated in the same way and the corrected products are used in determining the average grade of the prism. In Fig. 3, this method gives the content of the trapezoid as 50,515.59 metric tons of copper or an assay value of 1.630 per cent, copper. In Fig. 4, this method gives the trapezoid a content of 48,250.35 metric tons of copper, or an average grade of

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Top copper mines based on capacity worldwide

The Escondida mine in Chile is the world's largest copper mine, with a capacity of some 1.4 million metric tons. Escondida is owned by BHP Billiton, Rio Tinto, and Japan Escondida.

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Major Mines Projects Buenavista Mine

The Buenavista unit operates a leaching facility and three SX-EW plants. All copper ore with a grade lower than the mill cut-off grade of 0.38%, but higher than 0.25%, is delivered to the leach dumps. A cycle of leaching and resting occurs for approximately five years in the run-of-mine dumps and three years for the crushed leach material.

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METHODS OF ORE RESERVE

The global resource calculated for the Minetechpg copper deposit using triangular method is 142,545 tons (extent/size) ore at an average grade of 6.75% (value) Copper. In conclusion, the tonnage and grade determined using the two methods is approximately the same.

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Break Even Analysis - How to Calculate the Cut

I have also included an example to find the hypothetical cut off grade for a pound of copper (which is actually the break even analysis for copper mining): Mining Costs per Tonne (OPEX) Current Price per Pound. Cut-Off Grade (pounds per tonne) Cut-Off Grade (percentage per tonne) $ 33. $ 3.

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Decreasing Ore Grades in Global Metallic

For example, El Soldado copper mine (Chile) had an average oxide ore grade in 2003 of 1.7% and in 2012 the average ore grade was only 0.46%. As an average, the combined weighted decrease of the copper ore grade in all the mines analyzed was

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Some observations on copper yields and ore

Typically the yield of mines declines over time as mining proceeds. The average copper content of ore deposits is usually below the average yield of the ore accessed in the early years of production. The initial grades of new mines have not declined over the past forty years, and there has been no perceptible tendency for the average grade of porphyry deposits brought into production to ...

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Some Observations on Copper Yields and Ore

Studies have indicated the significant decrease in the average copper ore grade, from greater than 12% Cu to less than 1% Cu by mass, has been accompanied by an order of magnitude increase in ...

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CHILEAN COPPER MINING COSTS - Cochilco

AVERAGE COPPER MINING GRADES CHILE VS WORLD 2005-2016 • Average Ore grades of the sulfide line have decreased similarly (27%), Chile and the World. • Ore grades of the oxides line in Chile are lower than the world average. • There is a depletion of oxidized resources in Chile, which will mean 66% lower production of SX-EW cathodes by 2027. Source: Cochilco and Woodmackenzie

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Learning Goals: -What is an ore deposit?

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. 4. If a copper concentration comes back from the lab as 100ppm of copper, how many lbs of rock must be mined to ...

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Copper production: Zambia vs. the DRC -

The average mineral grade of copper in the DRC is also fairly high, making it a mining destination of choice for many investors. Most copper mines in the DRC are estimated to have an average ore grade of over three percent, far higher than the global average of between 0.6% and 0.8%. For example, the Tenke Fungurume copper mine – the biggest mine in the DRC in 2016 – has an average ore ...

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Everything You Need to Know About Copper

Large Size, Low Grade – Porphyries typically have 100 million to 5 billion tonnes of ore with a lower grade (0.2% to >1% copper). It is the size of these deposits that allow for bulk mining and economies of scale. Long Mine Life – The size of porphyry systems usually mean that the life of the mine can be multi-decades long. This means that ...

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Escondida Copper, Gold and Silver Mine,

The copper production in FY2020 was increased by 4% to 1,185kt, supported by concentrator throughput of 371ktpd. The mine is expected to produce between 940kt and 1,030kt of copper for FY2021, with a 4% decline in copper grade of concentrator feed as a result of reduced workforce due to Covid-19. Escondida geology and ore reserves

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METHODS OF ORE RESERVE

The global resource calculated for the Minetechpg copper deposit using triangular method is 142,545 tons (extent/size) ore at an average grade of 6.75% (value) Copper. In conclusion, the tonnage and grade determined using the two methods is approximately the same.

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Here's a plain language guide on how miners

“For an average gold orebody anything over 6g/t would be high grade, as a rule of thumb,” Mr Dugdale says. Less than 1.5g/t is low grade for gold. Silver (Ag) – less than 10g/t is low grade, over 50g/t is high grade; Platinum (Pt) – less than 1g/t is low grade, over 2.5g/t is high grade; Palladium (Pd) – less than 1.5g/t is low grade, over 5g/t is high grade. Base metals. Base metals ...

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Some Observations on Copper Yields and Ore

Studies have indicated the significant decrease in the average copper ore grade, from greater than 12% Cu to less than 1% Cu by mass, has been accompanied by an order of magnitude increase in ...

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Learning Goals: -What is an ore deposit?

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. 4. If a copper concentration comes back from the lab as 100ppm of copper, how many lbs of rock must be mined to ...

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Everything You Need to Know About Copper

Large Size, Low Grade – Porphyries typically have 100 million to 5 billion tonnes of ore with a lower grade (0.2% to >1% copper). It is the size of these deposits that allow for bulk mining and economies of scale. Long Mine Life – The size of porphyry systems usually mean that the life of the mine can be multi-decades long. This means that ...

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ore grade control in copper mine - workspoland.pl

With the case of copper, the study has shown that the average copper ore grade is decreasing over time, while the energy consumption and the total material production in the mine increases. Analyzing only copper mines, the average ore grade has decreased approximately by 25% in just ten years. In that same period, the total energy consumption has increased at a higher rate than production (46% ...

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Large Low Grade Copper-Gold Deposits: How

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 Copper Gold Inc. is the world’s largest, listed copper producer. It has operations in the America’s, Indonesia and Africa. It also happens to mine some of the lowest copper grades in the world. Cut-off ...

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Economic Filters for Evaluating Porphyry Copper Deposit ...

open-pit porphyry copper mines under current, and potentially future, economic conditions. Economic filters based on these simplified engineering cost models provide a method for estimating potential tonnages of undiscovered metals that may be economic in individual assessment areas. One implication of the economic filter results for undiscovered copper resources is that global copper supply ...

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METHODS OF ORE RESERVE

The global resource calculated for the Minetechpg copper deposit using triangular method is 142,545 tons (extent/size) ore at an average grade of 6.75% (value) Copper. In conclusion, the tonnage and grade determined using the two methods is approximately the same.

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Here's a plain language guide on how miners

“For an average gold orebody anything over 6g/t would be high grade, as a rule of thumb,” Mr Dugdale says. Less than 1.5g/t is low grade for gold. Silver (Ag) – less than 10g/t is low grade, over 50g/t is high grade; Platinum (Pt) – less than 1g/t is low grade, over 2.5g/t is high grade; Palladium (Pd) – less than 1.5g/t is low grade, over 5g/t is high grade. Base metals. Base metals ...

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Mining Valuation Lesson: Cut-Off Grade Theory

This is due to the greater benefit of a higher annual cash flow from the higher annual average grade outweighing the shorter mine life. However, eventually, the shorter mine life becomes too significant and the NPV declines. Looking at the table, you can clearly see that a cut-off grade of 4.0 reduces the relative NPV down to 0.6. Again, remember that increasing cut-off grade reduces your mine ...

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ON-SITE PROCESSING VS. SALE OF COPPER CONCENTRATES

capacity mine with small reserves but high grades of ore. Other than these special situations, the conclusion is that onsite refining should seriously be considered for most copper mines. 2 2. DOWNSTREAM COSTS: OUTLOOK The global copper markets have staged an impressive turnaround over the last couple of years, after several years of oversupply and low prices. LME copper metal

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