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» Cut-off Grades for Mineral Resource Reporting

Some reasonable cut-off grade needs to be applied to the mineral inventory prior to reporting them as mineral resources. A table or chart of sensitivity to cut-off grade may be supplied but zero or near-zero cut-off grades may not be reported in most cases. The methods of determining cut-off grade can vary, particularly for open pit deposits.

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Mining Valuation Lesson: Cut-Off Grade Theory And .Traduire cette page

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 $32 per gram (US$1000/31.1 grams) The...

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First Mining Gold: Duquesne, Duparquet & Pitt .Traduire cette page

Cut-off grade = >0.45 g/t Au (Tailings), >0.45 g/t Au (In-pit), > 2.00 g/t Au (Underground) Gold price assumption = CDN$1,450 per ounce. First Mining owns of the Central Duparquet Property, and a 10% indirect interest in the Duparquet Gold Project.

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Cut Off Grade Calculation Optimization

Cut Off Grade Calculation Optimization. Previous Next. View Larger Image ; Table of Contents ... 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 ...

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Porgera Joint Venture Technical Report · Fichier PDF

[email protected] . Barrick Gold Corporation – Porgera Joint Venture, Project #1669 Technical Report NI 43-101 – March 16, 2012 Rev. 0 Page i TABLE OF CONTENTS PAGE 1 SUMMARY..... 1-1 Executive Summary..... 1-1 Technical Summary..... 1-8 2 INTRODUCTION..... 2-1 3 RELIANCE ON OTHER EXPERTS..... 3-1 4 PROPERTY DESCRIPTION AND LOCATION ..... 4-1 5 .

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Structural factors in ore position, quality, and cut .Traduire cette page

The bonanza grade and tonnage of these ore shoots are related to the irregularity of their shape and the superimposition of both the lead-silver and copper-gold-silver types.Depth-related decrease of lead-silver type mineralization may be partly offset by the appearance of copper-gold-silver type at depth, as in the Clarines vein, or with both types appearing in a split (Bronces) below the ...

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Ore Cutoff Grade Optimisation

Cutoff Grade Optimization for a Gold Deposit. Consider a hypothetical case study where an epithermal gold deposit will be mined by an open pit. Table 1 gives assumed capacities and accepted costs to mine this deposit at 3000 tons/day milling rate. Table 2 gives the grade distribution of the material within the ultimate pit limits. Operating Cash Flow Analysis for Break-even Cutoff Grades. The ...

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Break Even Analysis - How to Calculate the Cut Off .Traduire cette page

In the following example, you will find the hypothetical cut off grade for an ounce of gold (which is actually the break even analysis for gold mining): Mining Costs per Tonne (OPEX) Current Price per Ounce Cut-Off Grade (ounces per tonne) Cut-Off Grade (grams per tonne) $ 150: $ 1,500 ($ 150 / $ 1,500 =) 0.10 ounce / tonne (0.10 x 28.349523125 =) 2.835 grams / tonne: I have also included an ...

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What is cut-off grade? An introduction to .Traduire cette page

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. From the project quoted above, there are some extraordinary intervals of gold mineralization. It should be noted that cut-off grade is not a static concept applied across all types of deposits.

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First Mining Gold: Mineral ResourcesTraduire cette page

Cut-off grades are based on a gold price of $1,400 per ounce and a gold processing recovery of 80%, and a silver price of $15 per ounce and a silver processing recovery of 60%. Appropriate mining costs, processing costs, metal recoveries and inter ramp pit slope angles were used to generate the pit design. The estimated life of mine strip ratio for the resource estimate is 2.1. Rounding may ...

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Mining Valuation Lesson: Cut-Off Grade Theory and .Traduire cette page

A mining valuation lesson on cut-off grade theory and practice. Applying the theory of cut-off grade to a gold mine to see how it affects mine life and more

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Great Southern Mining Ltd has 3000-metre drilling .Traduire cette page

Great Southern Mining Ltd (ASX:GSN) has begun a reverse circulation drilling campaign at its -owned Mon Ami Gold Project, 12 kilometres south of Laverton, Western Australia. The program of ...

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Cut-off grade determination for the maximum value of a ...

gold mining operation by R.C.A. Minnitt* Synopsis Work undertaken in the field of cut-off grade optimization has not advanced much beyond the work undertaken by Lane in 1988. His definitive work is based on the calculus of the Net Present Value criterion, which is the most widely understood, consistent, and appropriate method by which sequential cash flows arising from the extraction of ...

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Cut-off grade determination for the maximum value of a ... · Fichier PDF

The cut-off is calculated with reference to costs, prices and capacities regardless of the way the grades actually vary within the mineralized body. Making the appropriate substitutions of the data for a small Wits-type gold mine in Table III produce the following results for limiting economic cut-off grades for mining, processing and marketing.

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How to profit from low-grade gold mines - .Traduire cette page

A deposit of disseminated gold (small particles of gold distributed throughout the rock) close to surface will be open-pit mined, while gold found in often-thin veins hundreds of meters below...

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Mill cutoff grade | BritannicaTraduire cette page

In mining: Delineation .process it; this is the mill cutoff grade. The grade at which the costs associated with mining and mineral processing just equal the revenues is called the break-even grade. Material having a higher grade than this would be considered ore, and anything below that would be waste.

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-mineral cut-off grade optimization by grid search

In the mining process, the equivalent cut-off grades are only -mineral cut-off grade optimization by grid search by E. Cetin* and P.A. Dowd† Synopsis Orebodies that contain more than one economically important mineral are generally evaluated by parametric cut-off grades. This approach often leads to mis-valuation of mineral deposits because cut-off grades are not based on the grades of ...

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First Mining Gold: Duquesne, Duparquet & Pitt .Traduire cette page

Cut-off grade = >0.45 g/t Au (Tailings), >0.45 g/t Au (In-pit), > 2.00 g/t Au (Underground) Gold price assumption = CDN$1,450 per ounce. First Mining owns of the Central Duparquet Property, and a 10% indirect interest in the Duparquet Gold Project. The Measured, Indicated, and Inferred mineral resources for Duparquet shown in the above ...

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Determination of optimal cut-off grade - SAIMM · Fichier PDF

The cut-off grade is used to distinguish ore from waste materials. If the cut-off grade is too high, much of the mined material will go to the waste dump area. If the cut-off is too low, then the input capacity of the entire mining and mineral processing operations will be .

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Cut-Off Grades For Mineral Resource Reporting | .

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). For MRE reporting, COGs tend to be rounded down to ensure that material of no economic significance is excluded from the resource. To ...

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