Grade and Tonnage Uncertainty Analysis of an African Copper Deposit Using Multiple-Point Geostatistics and Sequential Gaussian Simulation . GradeTonnageCurve_HowFarCanItBeReliedUpon - Free download as PDF File (.pdf), Text File (.txt) or read online for free. One should be reminded that grade tonnage curves provide a global and statistical appreciation of what the ore deposit could deliver in an ideal circumstance. Abstract In order to develop long-term scenarios of copper supply and demand, a grade-tonnage density function model was developed for four major copper ore types. able The benefit of this is that the grade tonnage curve for relatively small from GEOLOGY 213 at Middle East Technical University GRADE-TONNAGE CURVES (Chapter 12) - Applied Mineral Inventory Estimation In the mining industry, from the geology and mine planning areas to management, the grade tonnage curve has been applied in economic and financial analysis probably being one of the most important tools used in determining the volume and grade of material in face of variations of the cut-off grade. The risk quantification in grade-tonnage curves is critical for capital investment in mining projects. Grade Tonnage Curve analysis Design of Mining perimeters. Type Chapter Information Now this is the point where the grade-tonnage curve comes into play. (PDF) Grade and Tonnage Uncertainty Analysis of an African Copper Cut-off Grades and Grade Tonnage Curves - Saimm polytech., montreal, can. 1 Pre-tax, based on a gold price of $1,650/oz 2 Mineral Resources use a gold price of $1,950/oz. Revisiting the Cumulative Grade-Tonnage Relationship for Major Copper 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 obtained when varying the cut-off grade applied. Mining 12 - GRADE-TONNAGE CURVES Published online by Cambridge University Press: 19 August 2009 Alastair J. Sinclair and Garston H. Blackwell Chapter Get access Summary A summary is not available for this content so a preview has been provided. Grades and Curves in the Simulation Section: Pentes et courbes dans la zone couverte par la simulation: Mineralized wireframes were interpreted and used to constrain grade interpolation by ordinary kriging with validation by inverse distance and change-of-support adjusted grade-tonnage curves. International mining software company MineRP worked on a spin-off of a SAP HANA POC and come up with a unique invention patented as a system and method for mineral asset management, accounting and analysis. PDF The Distributions and Relationships of Grade and Tonnage Among - USGS It is an unconstrained grade tonnage curve which, although very common, it is based in an assumption that can hardly be considered realistic especially in underground mining methods. lacking. By 2014, the cut-off grade is reduced to 0.25%. To find the tonnage of each block, the specific gravity of ore and core recovery percent is required. Best practice for interim estimates is to use a restricted search with ordinary kriging to compute estimates that closely matches the anticipated grade tonnage curve (Parker, 1979). Gain valuable visual snapshot of geology with Micromine Charts ; 7.5m blocks yield 52% of the total tonnage above cutoff at a grade of 0.310% Cu while 15m blocks yield 56% of total tonnage above cutoff at a grade of 0.289% Cu. Grade tonnage curve As the final size of a mineral deposit is defined by its grade and tonnage, a grade tonnage curve chart has been added to Micromine 2020 to visually maps and depict this end stage. Fig. Given the smoothing From geology and mining planning to management and investment areas they are used for economic and financial analysis . The Grade Tonnage Curve feature produces a chart that displays the average grade versus tonnage, allowing geologists to quickly understand the effect of mining at different cutoff grades. grade-tonnage curves, aiding decision makers to make well-informed decisions at the pre- . As the cutoff increases, the tonnage decreases. IAMG 2001--Cancun--Session D--Silva and Soares Origin - Micromine - Technology for Mining Significance of the" cut off-average grade-tonnage" Sensitivity Reserve estimation of central part of Choghart north anomaly iron ore The results of the . AssessRiskInGrade-TonCurve | PDF Tonnages - definition of tonnages by The Free Dictionary. 2 1. The grade-tonnage curve output by change of support represents change as a proportion, not actual tonnes. Predicted grade tonnage curve allows you to quickly generate grade tonnage curves at any given block size without the need to import a block model. Robex: Reports Prefeasbility Study Results for Kiniero, US$ 199 Million grade-tonnage curve - Spanish translation - Linguee methods of calculating tonnage in miningHome / methods of calculating tonnage in mining. Higher Metal Prices - Should We Lower the Cut-Off Grade? - Kuchling Hit Enter and configure the parameters in the window: Select the grade type Input a density Input a minimum cut-off grade (based on the statistics report) Input a maximum cut-off grade (based on the statistics report) Leapfrog Geo can display multiple grade tonnage curves on one graph. Using these curves, ten CIs (95%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20% and 10%) are generated to quantify uncertainty on the predicted mean tonnage curve. Analysis of komatiitic deposits from four regions revealed significant differences in grade and tonnage between regions. Inverse distance grade estimation. Figure 4. Geostatistical simulations for orebodies can be used to obtain grade-tonnage curves, and determine uncertainty and risk assessments. Please use the Get access link above for information on how to access this content. The 0.175% Cu cutoff grade is below the mean in this example. Close Log In. The upside being an extension in the mine life. grade-tonnage curve: use and misuse in ore-reserve estimation author david m ec. . Project Cut-off Grade Equation and Calculation.. Grade Tonnage Curves and Change of Support - YouTube Pit by Pit Graph at 30Mt per year Figure 7. tonnage calculation methods in mining able The benefit of this is that the grade tonnage curve for relatively In essence, periods when supply is low (or demand is high) may not be the right time to further cut supply by lowering head grades. AssessRiskInGrade-TonCurve - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Change of Support and the Volume Variance Relation - Geostatistics Lessons The grade tonnage curve is usually calculated . 8 shows the grade-tonnage curve of Choghart north anomaly iron ore . The idea of "the curve" goes back to a bell curve. In the mining industry, from the geology and mine planning areas to management, the grade tonnage curve has been applied in economic and financial analysis probably being one of the most important tools used in determining the volume and grade of material in face of variations of the cut-off grade. Porphyry copper-grade tonnage curve In the graph above, assume a hypothetical deposit of 1 billion tonnes grading 0.5% copper. The sensitivity analysis applied to the grade-tonnage relationship in mining projects is a recognized stage in all existing quality standards. Multivariate histogram The 500-meter rule was developed to insure that deposits in grade and tonnage models correspond to deposits as geologic entities. The traditional grade tonnage curve represents an optimistic scenario since it considers that all tonnage above one cutoff is available to be mined. grade tonnage curve | SAP Blogs The pit optimization analysis does yield a fair bit of information about the ore body configuration, the vertical grade distribution, and addresses how all of that impacts on the pit size. It must be kept in mind that the tonnage/grade curve is generated by a simple mathematical summation of the tonnes and in-situ grades of the resource blocks within the block model. Password. Generally, professors aim for an average grade in the C to B range . The grade tonnage curve is usually calculated with the in-situ resources or reserves and shows . Many translated example sentences containing "grade-tonnage curve" - Spanish-English dictionary and search engine for Spanish translations. Get Price. How Does Grading on a Curve Work? | BestColleges Pit by Pit Graph at 26Mt per year Figure 6. Log in with Facebook Log in with Google. PDF Grade Tonnage Curves - Gold Fields Since its beginning, with the works of D. Krige and later, G. Matheron, geostatistics has been analyzing in detail the essential factors at play in ore reserves estimation problems, with the ever-present aim of an optimal use of the available information. . Running on MT - Peak Copper | GoldSeek metric tons. ORE RESERVES (xlO6) FIG. Writing of weekly and monthly reports 90. ix LIST OF FIGURES Figure 1-1: Complex loop diagram of factors influencing cut-off . Rules such as the 500-meter rule used here are essential to an internally consistent assessment system where the estimated number of undiscovered deposits is consistent with the grade and tonnage model. 0.2 kg/t, and the minimum tonnage requirement about 3 X 106 t. Figure 3 illustrates that for a gross . Selection and Grade-Tonnage Relationships | SpringerLink Introduction The grade tonnage curve is widely used in the mining industry. Dynamic visualisation of single or multiple planes through Advanced reserve reporting with ability to break down by Support for a large number of blocks with options to add, delete or modify variables in real time. Efficiently and effectively communicate findings with dynamic charts and plots, including grade contouring, a flexible plotting environment, drillhole logs, scatterplots, histograms and special chart presentation layout mode, specifically designed for use in reports. It has been applied in financial analysis of the ore bodies providing an indication of the proportions (tonnages) and the grade at a range of different cut-off grades. This results in a potential range of size and grade for the deposit based on the current information. The Kiniero Gold Project has been evaluated on a discounted cash flow basis. the distribution of estimated block grades. 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