Break-Even Analysis
For conducting a mining project's break-even analysis you first need to know about the operational expenses (OPEX). 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 economical to mine the ore.
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Cut-off Grade Calculator
A COG represents the minimum grade needed to pay-off most* of the costs of mining and processing that material. With this tool, I help you calculate the COG for various economic scenarios. You supply the assumptions regarding costs, operating parameters, and metal prices and I'll handle the rest.
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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 ...
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A novel cut-off grade method for increasing the …
Various studies worldwide show that the head grade for copper, gold, platinum and other metals will decrease further by the end of 2030 (Batterham and Elvish, 2009, Walters, 2016, Rule et al., 2015). As an example, the copper grade has been decreased by 1.1% and Zinc by 23% in the past few years (Mudd, 2004, Batterham and Elvish, 2009, West, 2011).
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Mineral Reserves and Resources
Mineral Resources are reported at a 0.14% Cu cut-off grade. Economic assumptions for the reasonable prospects pit include: $3.50/lb Cu, $10.00/lb Mo, 84.6% Cu recovery, 8.9% Mo recovery, $1.74/tonne mining …
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Cut-off grades explained
The depth of a mineral deposit directly affects the cost to mine that deposit and therefore cut-off grade. Shallow and near surface deposits have a lower cut-off grade because they are mined at lower costs - it is cheaper to mine things that are closer to the surface with an open pit mine. Deep, underground deposits require …
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Cut-off grades explained
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. The cut-off grade is determined by the cost to mine a deposit, and the price that a company can sell the underlying commodity.
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Optimization of the cut-off grade for underground
The analysis results show that the selective mining of ore with a copper oxide grade . 10 % in total copper and ore with a copper oxide > 10% in total copper achieve an increase in the NPV by 24. ...
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Understanding Cut-Off Grade 4 (Tonnage, Grade, and Costs) or …
The tonnage/grade curve provides two key characteristics for the deposit under investigation. Firstly, the blue line represents the cumulative tonnage (y1-axis) of all blocks with grade at or ...
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What is cut-off grade? An introduction to overlooked yet …
First number is the average grade of the deposit and the second is the cut-off grade. What is the cut-off grade? In simple terms everything above the cut-off grade is ore, everything below is waste. In essence, it is the core determinate when defining an ore body.
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(PDF) A review of cut-off grade policy models …
In this context, given the grade-tonnage distribution and production capacities, if gl is considered as the cut-off grade, then the quantity of waste ( qw ), the quantity of ore ( qo ), and the average grade of ore ( g̅ ) as a function of this …
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Cut-off Grade Calculator
Making the Grade. A mineral resource must have a reasonable prospect for eventual economic extraction ('RPEEE'). A cut-off grade ('COG') provides some information regarding the overlap between grade and economics. A COG represents the minimum grade needed to pay-off most* of the costs of mining and processing that material.
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Optimal mill cut-off grade modeling in the mineral deposits …
Cut-off grade play a critical role in defining tonnages mined and processed, average grade of mill feed, cash flows, mine life time, and all major characteristics of a mineral deposit. Simply, the cut-off grade is the lowest grade at which material is considered ore and is processed to create a concentrated commodity product. Essentially, it asserts that the mill cut …
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Cut-off grade: A real options analysis
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.
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Cut-off Grades Explained
Materials with a grade above the cut-off are considered "ore," while those below are deemed "waste." The cut-off grade is determined by various factors, including mining costs, processing costs, metal prices, and the recovery rate.
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Break-Even Analysis
For conducting a mining project's break-even analysis you first need to know about the operational expenses (OPEX). When the OPEX is known you can calculate the mineral's …
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Cut-off Grades and Optimising the Strategic Mine Plan
Cut-off grade is perhaps the least understood driver of value for a mining operation. Many believe that it is determined relatively easily by knowing the mining and extraction costs, metallurgical …
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A novel cut-off grade method for increasing the …
1. Introduction. In recent years, the mining industry has faced considerable challenges by the depletion of ore grades (Topp, 2008, Prior et al., 2012).Various studies worldwide show that the head grade for copper, gold, platinum and other metals will decrease further by the end of 2030 (Batterham and Elvish, 2009, Walters, 2016, Rule et al., 2015).As …
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Incorporating environmental issues into optimum cut-off …
Cut-off grade is defined as the grade which discriminates between ore and waste within a given orebody. Determination of a complete optimum cut-off grade policy is a very important function during mine life. ... Ores in general are defined operationally by a cut-off grade. Material with a mineral content above the cut-off is scheduled for ...
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Mineral Reserves and Resources
Mineral Resources are reported at a 0.14% Cu cut-off grade. Economic assumptions for the reasonable prospects pit include: $3.50/lb Cu, $10.00/lb Mo, 84.6% Cu recovery, 8.9% Mo recovery, $1.74/tonne mining costs, $1.13/tonne G&A costs, $0.88/tonne operational support costs, $4.67/tonne milling costs, and pit slopes by rock type.
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Significance of the" cut off-average grade-tonnage" …
Grade-Tonnage-Cut-off curve representation of Escalones copper deposit, showing actual values. Figura 2. Curva ley-tonelaje-cut-off del yacimiento de pórfidos cupríferos de Escalones, mostrando ...
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Example Copper Project: Avg. Grade (Cu%) vs. Cut …
In the mining industry, cut-off grade is arguably the single most important policy and operating parameter. The cut-off grade value directly impacts the economics, configuration and life of a...
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Cutoff-grade decisions in relation to an Indian copper …
The following procedure was used to determine cut-off grades: define the orebody profile; plan the stope layout and quantify the work involved; formulate equipment-performance norms; calculate unit costs; input process recoveries and metal prices; and calculate the cut-off grade. Use of the method is illustrated using data from a copper mining complex in India. …
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Mining 101: Cut-off grades (and their role on in …
Calculating the cut-off grade involves a meticulous analysis of the 'total cost' incurred to mine and process a unit of ore, which includes operational costs, exploration, waste stripping, and environmental management costs.
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(PDF) A review of cut-off grade policy models for open pit …
context, the cut-off grade de fi nes the quantity of ore and waste, ensuring smooth supply of ore to the processing streams. While, the earliest signi fi cant effort towards the development of ...
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Example Copper Project: Avg. Grade (Cu%) vs. Cut-Off Grade …
In the mining industry, cut-off grade is arguably the single most important policy and operating parameter. The cut-off grade value directly impacts the economics, configuration and life of a...
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How to Calculate the Cut-Off Grade
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) – $33 Current Price per Pound – $3
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Cut-off Grades and Optimising the Strategic Mine …
Cut-off grade is perhaps the least understood driver of value for a mining operation. Many believe that it is determined relatively easily by knowing the mining and extraction costs, metallurgical recovery and an estimate of the price for the metal/s under
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Mining 101: Cut-off grades (and their role on in mining …
Calculating the cut-off grade involves a meticulous analysis of the 'total cost' incurred to mine and process a unit of ore, which includes operational costs, exploration, waste stripping, and environmental management costs.
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What is cut-off grade? An introduction to overlooked yet …
First number is the average grade of the deposit and the second is the cut-off grade. What is the cut-off grade? In simple terms everything above the cut-off grade is ore, …
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