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grade tonnage curve in mining

Resource estimation is used to determine and define the ore tonnage and grade of a geological deposit, from the developed block model. There are different estimation methods (see below) used for different scenarios dependent upon the ore boundaries, geological deposit geometry, grade variability and the amount of time and money available.

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 ...

How to calculate grade and recovery concentrate? Location: Home >> News >> Profession news In the process of ore dressing percentage, the percent of quality of a product obtained and quality of raw ore, known as the yield rate of product.

Oct 05, 2018· 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 ...

Aug 24, 2017· Abstract. Mineral resource evaluation should provide a basis on which economic decisions can be taken. At least, four aspects can be identified if a mining project is evaluated, technical, economic/financial, social, and political; this chapter introduces the first two.

Pulp Densities. Pulp densities indicate by means of a tabulation the percentages of solids (or liquid-to-solid ratio) in a sample of pulp. This figure is valuable in two ways—directly, because for each unit process and operation in milling the optimum pulp density must be established and maintained, and indirectly, because certain important tonnage calculations are based on pulp density.

The increase in the tonnage of copper by the Harding angular method proved to be more than 54,000 metric tons, and the percentage of copper per ton was also increased by 0.024 per cent. I worked out all the prisms, about 300, by the Harding angular method and by the standard method, and checked the results in each case by the geometrical method.

Feb 17, 2018· 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 …

The highest-grade gold mine in the world is the Fire Creek mine in Battle Mountain, Nev., according to 2015 data. With a gold ore density of 44.1 g/t, Fire Creek falls high above Macassa, the ...

Appendix A describes a relational database of tonnage, grade, and other information for more than 100 sediment-hosted copper deposits in the CACB. These data are used to calculate the pre-mining mineral endowment for individual deposits in the CACB and serve as the basis for the grade and tonnage models presented in chapter 2.

In mining: Delineation …often referred to as its grade. Grade may exhibit considerable variation throughout a deposit. Moreover, there is a certain grade below which it is not profitable to mine a mineral even though it is still present in the ore.

Assessment of Uncertainty in Grade-Tonnage Curves of a ... O. Erten, M. S. Kizil, B. B. Beamish The University of Queensland, School of Mechanical and Mining Engineering, Brisbane, Australia

C. Grade/tonnage curves To compare the estimates produced from the face sampling with the 'actual' values in the stopes we have constructed 'grade/tonnage!' curves more commonly known on the gold mines as 'payability' graphs. In brief, we apply a cutoff value or pay limit to the values and calculate the

Grade Tonnage Curve: How Far Can It Be Relied Upon? 2 1. Introduction 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 …

tonnage and average grade by plotting the cumulative tonnage against the grade. Turcotte (1997) further developed a tonnage-grade model, which results in a fractal relationship between tonnage and grade, by modeling the geological ore-forming process. It is suggested that the fractalmodel is an effective tool to describe the relationship ...

• Mining digability for a blast, mining block or bench can be determined using equipment specification curves with penalties applied for mining blast boundaries with acute angles. • Simulated annealing to determine the best outcome, balancing mining recovery and grade constraints for each equipment type.

SYNOPSIS — This chapter will ask many questions and give a few answers.Its purpose is to show how to correctly set a grade-tonnage problem. Starting from the definition of ore and ore reserves, the different parameters influencing the reserves will be reviewed and the several methods currently used to compute them will be reviewed in this light.

CHAPTER 11 GRADE AND TONNAGE MODELS FOR THE ANALYSIS OF NEVADA'S MINERAL RESOURCES Donald A. Singer INTRODUCTION Mineral deposit grade and tonnage …

Dec 04, 2018· There is no relationship between the green and red curves as they relate to two different Y-axes. To determine the tonnage you first determine from the red curve where your COG is at the required Ave Grade, read from the X-axis. Then you switch over to the green curve and read the tonnage from the primary Y-axis on the left.

Jul 16, 2015· Barrick/Newmont JV's Turquoise Ridge underground gold mine complex. Source: Panoramio. The grade or concentration of a mineral or metal in ore directly affects costs associated with mining …

In practice, blocks are selected according to their estimated value and not according to their true unknown value. In order to avoid serious errors in calculating a grade-tonnage curve, we must be able to define clearly the relationships existing between estimates and the corresponding true values.

Mar 24, 2017· A gram of gold is worth about $25, so 2 grams or better would be viewed as high-grade for bulk tonnage mining. One hundred metres of good grade is again good criteria for thickness.

This paper uses mining terminology. This is convenient because: (1) this is the language of most of the geostatistical literature (even environmental and petroleum papers refer to grade tonnage relationships, nugget effects, selective mining units and so on) and (2) the main audience for this paper is likely to have a mining background.

Now, if we go back to the original tonnage grade distribution as shown in our graph, we can see that roughly 6 per cent of our orebody has a grade of less than 1.5 grams per tonne. Obviously when we mine the orebody, we would try and stay away from mining and certainly would not treat the 6 percent of tonnage below the cut-off grade.

(g/t). This new grade and tonnage model is remarkable in that the estimated parameters of the resulting grade and tonnage distributions are comparable to the previous model of Mosier and others (1992). A notable change is in the reporting of silver in more than 10 percent of deposits; moreover, the previous model had not considered deposits in ...

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 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 ...

Before you can calculate the potential mineral deposit value, you first need to gather some specific data regarding the ore body and the individual drill results.. This required data can be found in the mining company's press releases in which they announce their drill results.Make sure that this data is announced according to the guidelines of National Instrument 43-101 (i.e. approved by a ...

block means and the population mean known, the grade-tonnage curve may be computed using the graphic solutions (Fig. 4.1 and 4.2) provided. 4.2 Study of grade-tonnage curve for the nodule area under study The grade - tonnage computations presented in the following sections are based on different block dimensions.

Porphyry Copper Deposits of the World: Database And Grade and Tonnage Models, 2008 By Donald A. Singer1, Vladimir I. Berger1, and Barry C. Moring1 Open-File Report 2008-1155 2008 U.S. Department of the Interior

Jun 27, 2013· ISATIS reference software for mining geostatistics by Geovariances 1. Isatis for the Mining Industry The precision you need ... from Grade-Tonnage curves according to SMU size and economic grade cut-off Various techniques are available to check the Block Support Effect: Uniform Conditioning Global Correction (through the anamorphosis function ...

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