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##### Mining Valuation Lesson: Cut-Off Grade Theory and …

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 …

##### Break-even is broken - MINING.COM

Using the cut-off value – tonnage distribution for Mine A, it can be seen that a marginal break-even cut-off grade for the ore reserves estimate can have significant downside effect if there is ...

##### Kamoa-Kakula Project | Ivanhoe Mines Ltd.

The Kamoa-Kakula Copper Project — a joint venture between Ivanhoe Mines (39.6%), Zijin Mining Group (39.6%), Crystal River Global Limited (0.8%) and the Government of the Democratic Republic of Congo (20%) — has been …

##### Solved Section III: Cut-off Grade, Mine Productivity ...

The cut-off grade of an ore is essentially the lowest grade of an ore that is worth mining. If the ore grade is less than the cut-off grade, then a mining company will not make money mining that ore. According to Fellows (2010), the cut-off grade of an ore is one of the main factors in determining the economics of the mine.

##### Solved Question 61 (1 point) How many pounds of 5% …

Science. Earth Sciences. Earth Sciences questions and answers. Question 61 (1 point) How many pounds of 5% grade copper ore need to be mined to get 500 lbs of copper? 25 0 100 2500 0 10,000 Question 62 (1 point) Many closed mines exist throughout the United States (and other countries). If the cut-off grade drops for ores once extracted from ...

##### Types of Copper Deposits in the World | INN

The average grade of copper ores in the 21st century is below 0.6 percent copper, with the proportion of ore minerals being less than 2 percent of the total volume of the ore rock.

##### Cut Off Grade Calculation Optimization

Cutoff grade is defined as the grade that is normally used to discriminate between ore and waste within a given orebody. Although the definition of cutoff grade is very precise, the choice of a cutoff grade policy to be used …

##### (PDF) Stripping Ratios, Pit Limits & Cutoff Grade ...

Optimum cut-off grade policy for open pit mining operations through net present value algorithm considering metal price and cost escalation. By Raul Cezar. Maximizing the net present value by applying an optimal cut-off grade for long-term planning of the copper open pits.

##### (PDF) A review of cut-off grade policy models for open pit ...

Yousuf Azimi. M. Osanloo. Determination of cut-off grade strategy is one of the most important stages of open pit mine planning and design. It is …

##### Preliminary Model of Porphyry Copper Deposits - USGS

The vertical extent of ore is dependent upon the lower copper cutoff grade, which will vary with the price of copper and local mining costs. At Dos Pobres, Arizona, from the top of the orebody to the 0.2 percent copper cutoff at its deepest points is approximately 1–1.2 km (Langton and Williams, 1982).

##### Cut-off grade estimation - QueensMineDesignWiki

Still, it is better to have a higher than lower cut-off grade, as a higher cut-off grade will extend the life of the mine, and if there is a business case, capacity can be added. So using the example above, we can assume that 3.5g/t AuEq is the calculated minimum ore grade necessary to operate productively given all the geologic, environmental ...

##### Polymetallic deposit cut-off grade estimation ...

An example for a polymetallic deposit can be seen below. Assume a selling price of \$2,500, \$2,400 and \$6,500 per tonne of zinc, lead and copper, respectively. For this example, the selling cost has been chosen to be 5% of the …

##### Polymetallic deposit cut-off grade estimation ...

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 …

##### Mining Valuation Lesson: Cut-Off Grade Theory and …

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 …

##### Resources and Reserves - Aeris Resources

A cut-off grade of 1.2% copper is used to estimate Ore Reserve in the higher-grade lodes 102 and 108. A cutoff grade of 0.9% copper is used for the lower grade 101 and 105 lodes that are to be mined in retreat at end of mine life. The Murrawombie deposit has separate Ore Reserve estimates for underground mining; and open pit mining.

##### Cut Off Grade Calculation Optimization

Cutoff grade is defined as the grade that is normally used to discriminate between ore and waste within a given orebody. Although the …

##### 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 …

##### Some observations on copper yields and ore ... - …

Such increases in scale may be accompanied by changes in cut-off grade, the boundary between ore that is processed and material that is sent to waste dumps. Technological progress and rising productivity tend to allow the extraction of ever leaner ores, but rising costs of all types tend in the other direction.

##### Capstone Mining - Capstone Presents a Robust Cobalt ...

Mineral Resources for the Santo Domingo Sur, Iris, Iris Norte, and Estrellita deposits are reported using a cut-off grade of 0.125% CuEq. CuEq grades are calculated using average long-term prices of US\$3.50/lb Cu, US\$1,300/oz Au, and US\$99/dmt Fe conc.

##### Determining the optimum cut-off grades in sulfide copper ...

Optimum cut-off grades determination in mining life affects production planning and ultimate pit limit and it is also important from social, economical and environmental aspects. Calculation of optimum cut-off grades has been less considered for

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

In the mining industry, cut-off grade is arguably the single most important policy and operating parameter. The cut-off grade value directly …

##### Reserves and Resources | Lundin Mining Corporation

The copper Mineral Resources are reported within geological volumes based on a nominal NSR copper cut-off value of EUR 32.85/t (grade equivalent to 1.0% copper), and the zinc Mineral Resources are reported within geological volumes based on a nominal NSR zinc cut-off value of EUR 30.55/t (grade equivalent to 4.5% zinc).

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

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 ...

##### Maximizing the net present value by applying an optimal ...

Daniel Kržanović, Božo Kolonja and Dejan Stevanović: Maximizing the net present value by applying an optimal cut-off grade for long- term planning of the copper open pits 50 Fig. 1. Steps in planning per circular analysis [4]. When planning the mining of copper ore, the final result depends on the perception of the whole

##### Cutoff grade optimization based on maximizing net …

Otherwise, by deducting the tonnage of the ore mined from the higher-grade fine ranges, the optimum cut-off grade and the fractionation of the waste ore from the sub-optimum, the amount of tonnage of the mineral input to the processing plant is calculated. For each year, the tonnage must be recalculated for each of the brightness ranges.