economic gold ore grades

Iron oxide copper gold ore deposits - Wikipedia

Iron oxide copper gold ore deposits (IOCG) are important and highly valuable concentrations of copper, gold and uranium ores hosted within iron oxide dominant gangue assemblages which share a common genetic origin These ore bodies range from around 10 million tonnes of contained ore, to 4,000 million tonnes or more, and have a grade of between 02% and 5% copper, with gold contents ,

Ore - Wikipedia

An ore is a natural occurrence of rock or sediment that contains sufficient minerals with economically important elements, typically metals, that can be economically extracted from the deposit The ores are extracted at a profit from the earth through mining; they are then refined (often via smelting) to extract the valuable element, or elements The ore grade, or concentration of an ore .

BONANZA ORES OF THE COMSTOCK LODE, VIRGINIA ,

BONANZA ORES OF THE COMSTOCK LODE, VIRGINIA CITY, NEVADA By EDSON S BASTIN , progress in the metallurgical treatment of low-grade gold and silver ores the probable persistence in depth of ores of this class also assumes practical importance , 44 CONTKIBUTIOttS tfO ECONOMIC GEOLOGY, 1&22, PABT I

Learning Goals: -What is an ore deposit? - geoarizonaedu

Learning Goals: -What is an ore deposit? , Typical mines today have ore grades of only 06 percent copper Since metal concentrations occur at , To determine if these concentrations are economic for Copper Longhorn to begin mining, they must look at the size of the deposit, the grade or concentration, mining costs and clean up/environmental .

THE IMPORTANCE OF DILUTION FACTOR FOR OPEN PIT ,

is the Mill feed grade - is the grade of ore in ground - is the grade of waste rock - is the dilution (a value between 0 to 1) The same unit must be used for all grades in this equation Table 1 shows the effect of 10% dilution on ore grade for a gold mine for one tonne of ore Assaying showed that waste rocks have a small amount of gold

What does the grade of a gold mine refer to? - Investopedia

The highest-grade gold mine in the world is the Fire Creek mine in Battle Mountain, Nev, according to 2015 data With a gold ore density of 441 g/t, Fire Creek falls high above Macassa, the .

What is the concentration of silver in economically ,

What is the concentration of silver in economically minable deposits ? , (or optimum grade) may be very different on types of ore deposits , Low grade gold and silver ore deposits are .

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

So why is the AuEq grade so much higher than the cut-off? Since it is an arbitrary number and not the actual assayed grade of the deposit, it includes all the tonnage greater than 35 g/t AuEq In gold deposits this can run into the hundreds or thousands of grams higher than the cut-off grade, leading to a much higher average grade

201 Metal Deposits – Physical Geology - opentextbcca

201 Metal Deposits Mining has always been a major part of Canada’s economy Canada has some of the largest mining districts and deposits in the world, and for the past 150 years, we have been one of the most important suppliers of metals Extraction of Earth’s resources goes back a long way in Canada

Break Even Analysis - How to Calculate the Cut Off Grade ,

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 to the note at the bottom of this page

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

Cut-off Grade Theory and Practice Consider a block of ore that weighs 1 tonne and contains 3 grams of gold At a gold price of US$1000 per ounce the value of the gold in the block of ore is just under $96 ($1000/31 X 3 or $1000 per ounce/ 31 grams (troy ounce) X 3 grams of gold)

Geology of Porphyry Copper Deposits

Here let’s understand the geology of porphyries and iron oxide copper gold deposits or IOCG as they are known These are somewhat the giants of the ore deposits world As a mining interested learner, the geology of porphyry copper deposits is vital to your education

Part Three Resources and Technology - Princeton University

often contain zones that are subeconomic in ore grade, which may become ore if either the price of copper increases or the cost of extracting the copper from the ore declines enough to make mining profitable Thus, significant changesin perceived ore reserves may occur for suchde- posits as a result of cost or price chang

What Is the Average Grade of Producing Gold Mines ,

Oct 05, 2012· What Is the Average Grade of Producing Gold Mines? , of ore concentrate & approx $636 per oz of Pd per Lb of ore concentrate spells $8,300,860 per ton of this type of ore for gold; approx $839,520 per ton of this type of ore for Pd, plus the Pt 1/5 to 1/4 oz per Lb & Ag are quite alot in precious metals in my opinion for a ton of my ore

Cut-off grade estimation - QueensMineDesignWiki

Polymetallic cut-off grade estimation is explained here Mineral Classification Cut-off grades are used to determine the point at which material becomes economically valuable Therefore, they are necessary to define the amount of ore in a deposit The classification of ore depends entirely on cut-off grade

Sulphide Gold Ore Treatment by Leaching and Flotation Process

Problem with gold recovery from sulphide ore: How may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return This latter point is most important In many cases a gold mill using an all-cyanide flowsheet with fine grinding of all the ore will report very low gold content in the tailings particularly on an .

Cut-Off Grades For Mineral Resource Reporting | SRK

A cut-off grade (COG) , Cut-off grades for mineral resource reporting: going the extra rare earth mile Resource Geologists are geologists who can value the basic underlying economic attractiveness of a mineral deposit This means knowing the costs and practicalities of mining and processing for a particular product

Understanding Cut-Off Grade 5 (Incremental Ore) or "Why is ,

Mar 26, 2018· Note that these are net recovered (payable) grades meaning that the block of ore in question must deliver this amount of gold for sale The in-situ grade will, of ,

DECLINING GOLD & SILVER ORE GRADES FOR DUMMIES

Nov 12, 2012· / Gold / Gold News / DECLINING GOLD & SILVER ORE GRADES FOR DUMMIES DECLINING GOLD & SILVER ORE GRADES FOR DUMMIES November 12, 2012 6845 By SRSrocco: After receiving a great deal of emails and replies on my declining ore grade work in the top gold and silver miners, I thought I would write this post to clarify a few misunderstandings

Gold Mining: The Importance of Ore Grade | Gold News

Jul 12, 2012· Gold Mining: The Importance of Ore Grade , Australia, discusses the importance of grade, selectivity and size in establishing the economic value of deposits The Gold Report: Andrew, you do a lot of work vetting deposits You have worked on epithermal gold, copper-gold porphyries, iron and coal deposits—just to name a few .

Gold Grade: Different Gold Grades: Grading 0f Gold Purity ,

Dec 14, 2012· Gold grade, different gold grades are gold purity, gold ore grading and collectible gold coin grading Gold grades: Carat, Karat Gold grade is gold purity Gold grades relate to the purity of gold; the grade of gold ore; and the grading of collectible gold coins Gold grading is undertaken in karat or carat according to your location Karat is abbreviated to kt or k and carat is abbreviated .

GRADE CONTROL BLENDING AND SELECTIVITY FOR ,

monitors ore tonnes and grades on stockpiles to enable optimal blending for the required plant process performance The grade control process is described below: DRILLING: Drill burden and spacing are based on the rock types present at Skorpion , eg 4 m x 4 m in ore ,

Types of Copper Deposits in the World | Investing News Network

Iron oxide-copper-gold (IOCG) ore deposits are highly valuable , The average grade of copper ores in the 21st century is below , but the deposit is still economic due to the large size of .

Origin of high-grade gold ore, source of ore fluid ,

The Meikle mine exploits one of the world's highest grade Carlin-type gold deposits with reserves of ca 220 t gold at an average grade of 247 g/t Locally, gold grades exceed 400 g/t Several geologic events converged at Meikle to create these spectacular gold grad Prior to mineralization, a Devonian hydrothermal system altered the Bootstrap limestone to Fe-rich dolomite

Grade | ore deposit | Britannica

Other articles where Grade is discussed: mining: Delineation: ,often referred to as its grade Grade may exhibit considerable variation throughout a deposit Moreover, there is a certain grade below which it is not profitable to mine a mineral even though it is still present in the ore This is called the mine cutoff grade And, if the material,

Global Gold Mine and Deposit Rankings 2013 - Visual Capitalist

The project economics of gold deposits are mostly dependent on two major factors: size and grade Without a sizeable ore body, a mining operation cannot acquire the economies of scale to bring down the cost of production Likewise, a project without grade may not have the margins for each ton of ore processed to justify production The average .

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

Feb 17, 2018· We have seen from the previous articles, that comparing the net equivalent recovered grade to an economic cut-off grade is simply a proxy for comparing the value of a block of ore ,

Gold Mining in Africa: Maximizing Economic Returns for ,

Gold Mining in Africa: Maximizing Economic Returns for , 1 The grade of a gold mine is a measure of the richness of the ore It measures the amount of gold (in grams) per ton of ore extracted The higher the grade, the richer the mine in gold, and consequently, the lower the cost of .

Making the grade: understanding exploration results ,

Mar 24, 2017· Making the grade: understanding exploration results Resource , where the ore grade is more than double that at $20 per tonne, results would be economic , Ontario mine where gold grades ,

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