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

3 minutes read A company covered by this site in the past has released a new resource. It was: 281,059 AuEq oz in the indicated category (1.21 Million tonnes ("Mt") grading 7.23g/t AuEq at 3.5g/t AuEq cut-off) 319,675 AuEq oz in the inferred category (1.64 Mt grading 6.18g/t AuEq at 3.5g/t AuEq cut-off) That's a lot to unpack for an investor!

### Cut-off Grades and Optimising the Strategic Mine Plan

N. Hosseini, E. Ben-Awuah. Business. 2018. Cut-off grade is the criterion that separates ore from waste and it determines the amount of ore and waste material in the final pit limit. To generate an optimum production schedule for the mine…. 2. Highly Influenced. PDF. View 4 excerpts, cites methods and background.

Incremental cut-off grade: mill operating cost/(grade x recovery x metal price). Mathematically, the mining cost in open pits cancels out and is irrelevant - if ya don't mine, ya don't got no ore.

### The Cut-Off Grade and the Theory of Extraction

extracted ore as the cut-off grade problem. Technological infeasibility or high costs can prevent the firm from returning to extract the lower quality ore at a ... and a constant metal price have found that the cut-off grade should decrease over time (e.g., Dowd, 1976), and so metal output decreases as the present value price decreases. Napier

### Ore Cutoff Grade Optimisation - Metallurgist & Mineral …

where fa is the annual fixed costs. For example, according to above equations 3, 4, and 5 the optimum cutoff grade for year 1 can be calculated as follows : F (l) = 0.15 x \$413.8/1.05. F (l) = \$58.56/ton of ore milled, Table 4 gives yearly tons and grade schedules resulting from optimum cutoff grades calculated for each year similar to year 1.

### (PDF) DETERMINATION OF OPTIMAL MINING CUT-OFF GRADES: …

We compare our results with those contained in the Company's Comprehensive Technical Report and note that a higher NPV can be achieved using our calculated 0.30 Cu% cut-off grade in lieu of the ...

### Extraction of Aluminium (Aluminium Ore) - Hall-Heroults …

The Hall-Heroult process is widely used in the extraction of aluminium. In Hall-Heroults process, pure Al 2 O 3 is mixed with CaF 2 or Na 3 AlF 6. This results in lowering the melting point of the mixture and increases its ability to conduct electricity. A steel vessel with a lining of carbon and graphite rods is used.

Cut-off grade (COG) is calculated as follows: COG (g/t) > \$CDN 150/t / 1,250 \$US/oz x 31.103 g/oz / 1.24 \$CDN/\$US COG (g/t) > 3 g/t So, all blocks in this deposit that can deliver at least 3 g/t of...

### Cut Off Grades Explained - Next Investors

A cut-off grade is the grade of mineralisation that a deposit can be economically mined and dictates which drilling intercepts can and can't be used in a JORC resource. ... If the cost to extract 1 gram of gold from 1 tonne of ore is ~\$50 per gram and the gold price is trading at \$100 per gram then a cut off at or above 0.5g/t may be ...

### Cut-off Grade Optimisation Feb 07 - Whittle Consulting

The illustration used throughout involves an ore body with a marginal cut of grade of 1.0%, and an average grade of ore (material above 1%) of 1.5%. By mining in multiple optimal phases, the early average grade is raised from 1.5% to ... Although a higher metal price lowers the marginal cut-off grade (from say 1% down to 0.8%) it

### Break Even Analysis – How to Calculate the Cut Off Grade

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 ...

### 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 deducting transportation and treatment costs.

Cutoff 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. [1] The cutoff grade can be determined through a variety of methods, each of varying complexity.

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.

### Cut-off Grades for Mineral Resource Reporting - Micon …

In a polymetallic mine, the cut-off may be expressed as an 'equivalent grade' of the primary metal, or by the net smelter return (NSR) value of the mineralized material. That cut-off will be whatever grade is …

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

Incremental cut-off grades can be calculated by converting the incremental downstream mining and processing costs at the decision point into a cut-off grade by dividing the cost by the metal price ...

### aluminium ore cut off grade - astasy.it

Low-grade ore. Low-grade ore is a term applied to iron-rich rocks with cut-off grades in the range of 25ï¿½30% Fe. It was the main supply of iron ore for many centuries of the World's early history of production of iron. Since the 1950s North America's main supply has …

### Cut-off grade: A real options analysis - daneshyari.com

a lower cut-off results in a loweraverage quantity of usable metal in the same amount of ore being processed. Since maximum ore processing capacity is generally ﬁxed, lower cut-off values lead to slower metal output rates (since less metal is produced in the same amount of ore processed). Raising the cut-off has the opposite

### 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) Simply put, if it were to cost more than \$96 to mine, treat, and ...

### Cut-Off Grades For Mineral Resource Reporting: Going The …

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. To calculate a COG, we can gauge the likely ...

Cutoff grade. Cutoff 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. [1] The cutoff grade can be determined through a variety of methods, each of varying complexity.

### Mining method constraints - BOOK - Cut-off_Grades.pdf - 1Library

Parallel ore streams are not handled by the simple form of Lane's methodology. Stockpiles. Stockpiling of mineralisation with a grade below the current cut-off is often viable with an open pit,22 with stockpiled material becoming additional rock that can be reclassified . ... Lane's Methodology In a single-metal open pit, Lane's theories ...

### Understanding Cut-Off Grade 5 (Incremental Ore) or …

Using the 1,250 \$US/oz, this roughly translates to 3.7 g/t as an AISC cut-off grade. The mine is running at 5.0 g/t currently. A flood occurs and …

### Aluminium Grades 1050, 5052, 5083 and 5754 | Fractory

Aluminium EN AW-1050. Aluminium alloy 1050 is a widely used aluminium grade for sheet metal forming. Although the strength values are low, its great corrosion resistance and high ductility make it a great fit for many applications. Another reason to use it is the nice reflective surface aluminium 1050 provides.

### Cut-off Grades for Mineral Resource Reporting - Micon …

That cut-off will be whatever grade is needed to recover enough metal or mineral to pay the cash costs of production. These costs typically comprise mining (stoping and stope development), hoisting/hauling, processing, royalties and general and administrative (G&A) costs. If the revenue from the recovered metal or minerals covers these costs ...

### Optimization of Cut-off Grades for Molybdenum and …

ore is higher than or equal the cut-off grade, it should be as ore; otherwise, it should be divided into waste rock. The optimization theory of single metal cut-off grade has been put forward (Lane 1988) earliest, which is considered to be a landmark …

### A review of cut-off grade policy models for open pit mining operations ...

Cut-off grade is the most important economic criterion that defines the supply of ore and waste material from the mine to subsequent processing streams and waste dumps, respectively (King, 1999, King, 2001, Wooler, 2001).The material with metal content greater than the cut-off grade is designated as ore because under existing economic situation, not only …

### Tin – Mineral Resource & Ore Reserve Estimates - Metals X

Cut-off grade of 0.7% Sn. Cut-off Grade of 0.0% Sn. The Rentails Mineral Resource is at 31 May 2018. ... Ore Reserve Estimate. The Ore Reserve estimate for the Renison Tin Operations is in compliance with the JORC Code (2012 Edition) and is as of 31 March 2020 and was published on 17 June 2020. There has been no material change to the Ore ...

### Using equivalent grade factors to find the optimum cut-off …

Ataei & Osanloo presented an optimum cut-off grade of multiple metal deposits by using methods such as, the grid search method (Ataei & Osanloo, 2003a), the equivalent grade method (Osanloo ...

### CUT OFF AND BREAK EVEN GRADES, PERSONAL CONSIDERATIONS …

Cut Off Grade: In a general usage context, it is a grade that delineates a portion of Mineral Resource and Ore Reserves that has an average …

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