As a rule of thumb, open pit mining can process ore for $10 per tonne and, where the ore grade is more than double that at $20 per tonne, results would be economic. Consider that 1% of a metric ...

Itakpe Iron ore deposit has been studied. This study was carried out by converting the values and production costs of the construction stones to their main ore equivalent using some mathematical models. The study shows that by adding the value of the construction materials to the value of the iron ore, cut-off grade of Itakpe iron

IRON ORE Indian Minerals Yearbook 2012 (Part- III : Mineral Reviews) 51st Edition IRON ORE ... of the production was of grade below 55% Fe. In the case of iron ore fines, 14.6 million tonnes (14.0%) of the production was of grade 65% Fe ... Figures Rounded off. 28-5 IRON ORE T able – 2 : Reserves/Resour ces of Ir on Or

Although iron ore resources occur in all Australian States and Territories, almost 90% of identified resources occur in Western Australia. ... It has been estimated within geological boundaries using a 38% Fe cut-off grade for beneficiation feed mineralisation and a 52% Fe cut-off grade for CID mineralisation. It has not been updated since to ...

Estimates of the tonnage and average grade of ore deposits (ore-reserve estimates) are made for various purposes. They may be made by examining engineers as a basis for placing a value on a mining property in connection with reports on behalf of owners or vendors, on the one hand, or for prospective purchasers or lessees, on the other.

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.

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Changes to Pilbara Ore Reserves and Mineral Resources . 2. March 2018 . ... Ore Reserves and Mineral Resources for four Pilbara iron ore deposits in Western Australia compared to, ... (Brockman and Marra Mamba ore) Reserve tonnes is due to cut-off grade changes and mining depletion. Page 7 of 19 . Robe Valley Mesa B, C, & H ...

The company is also a key user of Metal Bulletin's 62% Fe Iron Ore Index (MBIOI-62) for its mid-grade products. The days of the annual "mating season" - when steelmakers and major iron ore miners would play brinkmanship over who would give way first over setting an annual iron ore price - are long over.

A cut-off grade (COG) ... Cut-off grades for mineral resource reporting: going the extra rare earth mile. Resource Geologists are geologists who can value the basic underlying economic attractiveness of a mineral deposit. This means knowing the costs and practicalities of mining and processing for a particular product. ... To calculate a COG ...

Time cut-offs for the submission and subsequent publication of new bids and offers are applied so that MOC participants cannot bid or offer late in the process, and to ensure that every bid and offer published by Platts is ... Methodology and specifications guide Iron ore: January 2019 ...

In addition to this, depletion of high grade iron ore, stringent environmental regulations involved in opening of new mines, problems involved in handling, disposal of tailings (slimes), and utilizing of iron ore at 45% Fe as a cut-off fixed by Indian Bureau of Mines, it is the need of hour to effectively beneficiate low grade iron ore.

grade above a given cut-off grade". Royle's approach with slighl modification will be used in this paper, and the optimum cutoff grade is defined as the grade of ore that maximises the markelable reserves of ore. INTRODUCTION The grade distribution is never perfectly uniform within a GENERAL REQUIREMENTS mineral deposit.

Stripping ratios aren't often discussed, but they can be an early and important indicator for mining projects. Here's what investors should know about them. A strip ratio, or stripping ratio ...

Dec 05, 2011· Cut-off Grade Theory and Practice. ... it would be easy to calculate. But not all the tonnes of ore that make an orebody contain the same grade …

Jul 16, 2015· In 2012, two barges carrying high-grade gold ore presumably from Avlayakan mine, capsized and sank in the Okhotsk Sea. With remarkable 18.2 g/t ore grade…

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 economically viable to mine the ore. To find out how I come up with the cost price per tonne (OPEX) if a feasibility study isn't available, I refer you to the note at the bottom of this page.

(cut-off grade). The effects of the iron grade are more evident in the energy consumption of mining than the opportunities lost when a higher grade ore is not used (not to mention the improvement in product price and, approved break even iron grade, and the easier supplier differentiation). When the iron grade is too low to transport the ore,

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.

That means that the higher the cut-off grade, there is even a possibility that the NPV would be negative as the mine life and recoverable ore becomes too small. The important factor is selecting the cut-off grade that yields the highest NPV. In our table, that means selecting the 2.5 grams per tonne cut-off grade.

Answer to 3.4 Calculate the cutoff grade of an iron deposit, given the following: Iron ore price: $84/long ton ($82.68/tonne), 100...

Calculation of Ore Tonnage & Grade from Drill hole Samples ... was calculated by the method just outlined and the results of the calculation of tonnage and grade of the ore content are shown in the accompanying table of calculations. ... Geology | Comments Off on Calculation of Ore Tonnage & Grade from Drill hole Samples. Previous Next. Related ...

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 grade – a criterion used to discriminate ore from waste – has direct impact on mineable reserves and average grade of the materials that must be processed. The most comprehensive method for determination of optimum cut-off grades in metal deposits with the goal of maximising the net present value is provided by Lane's algorithm.

*Simplified calculation – factors such as carbon ... Only high-grade iron ore will do… • Most DRI producers require pellet input feed of ~67% Fe or above to achieve typical target DRI quality • Cut-off for being considered 'DR-grade' can be looked at as an . economic. boundary more than a …

Easy profit maximization method for open-pit mining. Author links open overlay ... It is worth noting the instant relationships that must exist between the quantities of ore, waste rock and the actual cut-off grade. ... Values of the optimal cut-off grade and the maximum total profit for a range of iron ore concentrate selling prices of ±25% ...

onward utilization in cut-off grade assessment. Hence, various experts have attempted to establish if there is a functional relationship between ore grade (feed grade) and concentration characteristics like recovery, yield, and tailings grade which are essential variables in cut – off grade estimation. If such

About Equivalent Grade. What Equivalent grade is the term used where mineralisation that is comprised of several metals of economic value is converted to a single metal. Typically the minor metals are converted by formula and added to the grade of the major metal. ... What to Watch for with BIF and Iron Ore ...