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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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First Mining Gold: Duquesne, Duparquet & Pitt .

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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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The world's highest grade gold mines - MINING.COM

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Evolution Mining's Mt Carlton open-pit gold mine in Queensland, Australia, sits ninth with 4.3 g/t gold grade in reserves. Randgold's Gounkoto mine complex, located in Mali, closes list of top ...

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Definitions - This is Gold

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Cut-off grade Minimum grade at which a unit of ore will be mined to achieve desired economic outcome. Cyanidation Treating finely ground rock with cyanide solution that dissolves gold. Cyanide code International management code for manufacture, transport and use of cyanide in producing gold. Aims to promote responsible management of cyanide used in gold mining. Cyanide leaching Extraction of ...

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Overview and Mineral Resource Estimate - Pine .

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The cut-off grade used for the Mineral Resource Estimate ranges from 1.70% to 2.00% equivalent zinc. The reason for the cut-off grade variation is due to the fact that different haulage costs are applied depending on the distance of the deposit to the assumed mill site.

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Making the grade: understanding exploration .

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The Ivanhoe Mines Kakula deposit in the DRC has returned very high copper grades, including 11.91 metres (true width) of 6.23% copper at a 3.0% copper cut-off. GOLD: One ounce, or roughly 30 grams/tonne is high-grade and can be expected to move markets in most cases. Several ounces of gold per tonne is considered to be high-grade for ...

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Gold Assaying and Gold Grades - Investing News .

The cut-off grade is the grade of material below which mining is uneconomic. Calculating the cut-off grade involves completing a mini-feasibility study in which all the known and potential costs ...

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Cut-off grade estimation - QueensMineDesignWiki

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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. Although in a variety of units can be used, the cut-off grade is usually expressed as: g/t (grams per tonne)

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What is cut-off grade? An introduction to .

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If cut-off grade is set too low, then there is overcapacity and equipment meant for a 40,000 tonne a day mine, is expensively underused at 20,000 tonnes a day. Moreover, mines are expected to last a certain number of years, to pay off their capital costs, and return capital to shareholders. By setting cut-off grade too low, what was ore is now re-classified as waste and tonnage evaporates ...

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Break Even Analysis - How to Calculate the Cut Off .

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

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17/02/2018 · Understanding Cut-Off Grade 4 (Tonnage, Grade, and Costs) or "Why is my mine losing money?" Published on February 17, 2018 February 17, 2018 • 172 Likes • 14 Comments

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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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Determination of optimal cut-off grade - SAIMM

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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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Mill cutoff grade | Britannica

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Other articles where Mill cutoff grade is discussed: 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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Cut-off grade determination for the maximum value of a ...

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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 - .

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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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A review of cut-off grade policy models for open .

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In this context, the cut-off grade defines the quantity of ore and waste, ensuring smooth supply of ore to the processing streams. While, the earliest significant effort towards the development of models for cut-off grade policy dates back to 1960s, a number of contributions on this vital aspect of a mining operation have been made since then. This paper presents a comprehensive overview of ...

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Great Southern Mining Ltd has 3000-metre drilling .

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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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Early Drill Results Support Emerging Large-Scale .

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Il y a 11 heures · A first batch of assay results have arrived from a recently completed diamond drilling program at Titan Minerals Limited's Dynasty Gold Project, providing further support of an emerging large-scale gold system and extending known mineralisation that remains open in multiple directions.The company is also currently re-logging and sampling historical drill cores on the project, with assays ...

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Cutoff grade - Wikipedia

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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 are selected to achieve a certain objective ...

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Porgera Joint Venture Technical Report

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[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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