Grade-tonnage curves. a. Define the relation between tons of ore and the grade cut-off; usually: * The lower the grade, the higher the tonnage. * The higher the grade, the lower the tonnage. b. Consider accuracy of grade / tons estimates. c. Allow for optimization of cut-off grades.

Coal quality–tonnage curves are graphical representations of recoverable coal resources, which plot the tonnage and mean coal quality values versus the cut-off …

The grade-tonnage curves indicate the coal amount above of cut-off grade and its average quality value. Thus, the fluctuations to be encountered during production previously can be seen and ...

The grade tonnage curve is widely used in the mining industry. From geology and mining planning to management and investment areas they are used for economic and financial analysis being probably one of the most important tools for representing variations in the …

Start with Grade-Tonnage Curve. 2. Define: P - Price C - Milling Capacity s - Marketing Costs m - Mining Costs c - Milling Costs fa - Fixed Costs d - Discount Rate 36 Steps Of The Algorithm (Cont.) 3. ... Stoping, which is the initial link in the chain of the production processes of coal-face operation, significantly determines the performance ...

face of variations of the cut-off grade. The grade tonnage curve is usually calculated with the in-situ resources or reserves and. shows always the 'best' or 'optimistic' scenario, i.e., at a given cut-off grade the respective. tonnage depicted by the curve presents the ideal situation where all the material would be.

(4 marks QUESTION 3 (25 marks) Table 3.1 presents the grade-tonnage curve and corresponding (function of g l ) quantity of ore, quantity of waste, average grade of ore, ratio of quantity of ore per unit of material mined (mc), ratio of recoverable metal per unit of material mined (mr), and the ratio of recoverable metal per unit of ore (cr).

Assessing uncertainty in grade-tonnage curves is rather crucial in resource estimation, as these curves provide information on how much ore within the deposit is above/below a given cut-off grade value. Conditional simulation algorithms can provide robust quantification of the ore production by generating multiple realisations of the ore deposits.

The grade-tonnage curve helps explain why that is. In the spider diagrams, we typically see sensitivities related to +/- 20% on metal prices and operating costs. If either of these factors change, then in reality the cutoff grade would change. If the metal price decreases by -20%, or the operating cost climbs by +20%, the cutoff grade must ...

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Leapfrog Geo can display multiple grade tonnage curves on one graph. To create a grade tonnage graph, right click on a block model and select New Grade Tonnage Graph. A new Grade Tonnage window will open: You can select a Block Filter query by choosing a filter from the Query Filter list. To add a new filter to this list, create a new filter in ...

Table 2 shows the grade-tonnage equations calculated based on Eqs. 3 and 4 applied for each location. Figures 2 and 3 indicate the declining trend of Cu grades with cumulative production for selected localities. Grade-tonnage curves were predicted at 0.2% for Cu, Ni, Pb, and Zn; 0.2 g/t for Au; and 20% COG for Fe.

The area influenced by any given hole is found as follows: (1) Divide angle at hole by 180°. (2) Multiply total area of entire prism by above result. (3) Multiply area found by (2) by the average thickness (found by solution of the formula) of ore in the hole, which thus transforms this smaller prism into volume.

Grade-tonnage curves are graphical representations of recoverable reserves, in which reserve, quantity of metal and mean grade are plotted against cut-off grade. ... The impact of variability and correlation of selected geological parameters on the economic assessment of bituminous coal deposits with use of non-parametric bootstrap and copula ...

1. Introduction. Recoverable resources are that part of resources that grade value exceeds a given cutoff value. These resources are typically estimated for a given selective mining block and a number of cutoff values and …

with a set of exogenous supply curves (see Table 7-26 for coal supply curve data) for each coal grade in each supply region. The curves show the supply of coal (by coal supply …

Grade Tonnage Reporting. The GT (Grade Tonnage) Curve component can be inserted below any block model data component to generate a grade tonnage curve. The GT Curve component can be inserted below an assay or domain in the Project Tree.The way that a GT Curve component is configured depends on whether it is inserted beneath an assay or …

A grade tonnage curve combines two or three equations together to produce one of the more important tools for analysing the data indicating the potential amount of material …

mine with an average grade of 6 g/t Au and a logrithmic variance of 1.2 are applied to the model to illustrate the benefits of representing cut-off grades in terms of present value curves for different segments of a mining operation. Keywords: cut-off grade, Net Present Value, grade-tonnage curve, balancing cut-off grade, mining, processing ...

22-01-2016· Coal quality–tonnage curves are graphical representations of recoverable coal resources, which plot the tonnage and mean coal quality values versus the cut-off grade. These curves are used in all phases of a mining project, including resource estimation, mine planning, and production scheduling.

Grade-and-tonnage modeling by deposit sub-types. There are four sub-types of sandstone-hosted deposits – roll-front, tabular, basal channel, and. tectonic-lithologic. The sandstone-hosted dep ...

Empty coal trains heading back to the mines in western and northwestern Colorado usually operate in a 2×1 power configuration, with all three locomotives online just to get up the grade. Westbound manifest …

GRADE-TONNAGE CURVES; Alastair J. Sinclair, University of British Columbia, Vancouver, Garston H. Blackwell, Queen's University, Ontario; Book: …

The grade-tonnage curves indicate the coal ... Elbistan Lignite basin, the obtaining of grade-tonnage curves of a certain production panel by using computer software, its correctly interpretation ...

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A.E. Tercan, P.A. Dowd (1993), "The effect of the nugget variance of the grade variogram on the estimation of conditional distributions by indicator and probability kriging ...," Uncertainty Assessment of Coal Quality-Tonnage Curves through Minimum Spatial Cross-Correlation Simulation ", International Journal of Mining and Geo ...

Typical grade-tonnage curve with a cut-off grade of 5g/t. The resultant tonnes above 5g/t are 10.2 million tonnes and the average mining grade is 8.1g/t.

grade-tonnage curves Alastair J. Sinclair, University of British Columbia, Vancouver, Garston H. Blackwell, Queen's University, Ontario Book: Applied Mineral Inventory Estimation

Tonnes (kt) Grade (g/t) Gold (koz) Classification Dec 16 Dec 15 Dec 14 Dec 16 Dec 15 Dec 14 Dec 16 Dec 15 Dec 14 Underground Proved 138 242 258 5.41 8.84 8.92 24 69 74 Probable 2,742 3,110 3,299 5.47 5.96 7.41 482 596 786 Total underground 2,880 3,352 3,556 5.46 6.17 7.52 506 665 860 Surface Proved 92 27 56 3.04 5.24 2.62 9 5 5 Total …