# grade tonnage curve in mining

### Grade/Tonnage Curves and Optimization of a Mining Project

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 everpresent aim of an optimal use of the available information. Not only do the reserves depend on the geological in situ resources, they also

### Break Even Analysis How to Calculate the Cut Off Grade

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

### The Mine Call Factor kriging

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

### Using Geostatistics to Estimate the Resources of a Narrow

Figure 54: Gradetonnage curve showing resource quantity and average grade using a 50 % lower limit of confidence. Figure 55 shows all of the gradetonnage curves in a single chart. Generally, as do all gradetonnage curves, as the cutoff grade increases, the undiluted resource above cutoff decreases and the average grade increases.

### Descriptive models, gradetonnage relations, and databases

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

### What is CUTOFF GRADE? What does CUTOFF GRADE mean?

Oct 05, 2018 · CutOff 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

### Vulcan Geology Modules maptek

• Mining digability for a blast, mining block or bench can be determined using equipment specifiion 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.

### What the Heck is the Kriging Oxymoron and What Does it

Mar 05, 2016 · Thus, the SMU grade tonnage curves are regarded as predictors of the tonnes and grade that will be available for mining at the time of mining. So generally it''s a

### Selection and GradeTonnage Relationships SpringerLink

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 gradetonnage curve, we must be able to define clearly the relationships existing between estimates and the corresponding true values.

### What Does the Grade of a Gold Mine Refer To? Investopedia

The highestgrade 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

### Making the grade: understanding exploration mining

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

### USGS Mineral Resources OnLine Spatial Data

Mineral resources information, along with the geologic, geochemical, and geophysical information needed to understand and assess mineral resource potential. Information on VMS deposits from around the world with new grade and tonnage models for three subtypes of VMS deposits and data allowing loions of all deposits to be plotted using

### True giants of mining: World''s top 10 iron ore mines

Sep 17, 2015 · Vale''s Carajas Mine Complex is the second biggest iron ore production center, which consists of three openpit mines, namely Carajas N4E, N4W and N5, and operated as the Serra Norte Mining

### Maiden Resource at Goulamina Confirms Large Tonnage

Goulamina is a high grade lithium deposit with low iron contents. The gradetonnage curve is shown in Figure 5. Significant observations include The global resource is reported at 0% Li2O cutoff. At elevated cutoff grades, the tonnages of mineralisation do not vary substantially, confirming the robust grade and good continuity of the

### Making the grade: understanding exploration mining

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

### Descriptive models, gradetonnage relations, and databases

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

### How to calculate grade and recovery concentrate?Ore

How to calculate grade and recovery concentrate? Loion: 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.

### Using Geostatistics to Estimate the Resources of a Narrow

Figure 54: Gradetonnage curve showing resource quantity and average grade using a 50 % lower limit of confidence. Figure 55 shows all of the gradetonnage curves in a single chart. Generally, as do all gradetonnage curves, as the cutoff grade increases, the undiluted resource above cutoff decreases and the average grade increases.

### Assessment of Uncertainty in GradeTonnage Curves of a

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

### SedimentHosted Gold Deposits of the World—Database

(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

### CAREFUL OF THE GRADE/TONNAGE TRAP!! Mine Planning St

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

### Luis de la Torre Palacios and José Antonio Espi Geológico

The sensitivity analysis applied to the gradetonnage relationship in mining projects is a recognized stage in all existing quality standards. However, once presented, the results are hardly commented on or criticized. This study analyzes more than 50 projects grouped by copper and gold metallogenetic models which find their own characteristics

### Mineral Deposit Value – How to Calculate the Potential

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 43101 (i.e. approved by a

### BGS Has One of the Highest Grade Hard Rock Lithium

In the last 12 months, lithium and gold seem to have taken the mantle as the dynamic duo – the Batman and Robin – of the commodity sector. While demand continues to surge for lithium on the back of the new energy storage boom led by Tesla, Samsung and many other major battery manufacturers who are desperate to shore up lithium supply, gold has also been an investor favourite of late.

### Stripping ratio Wikipedia

In mining, stripping ratio or strip ratio refers to the ratio of the volume of overburden (or waste material) required to be handled in order to extract some tonnage of ore. For example, a 3:1 stripping ratio means that mining one tonne of ore will require mining three tonnes of waste rock.

### Tonnagecutoff model and average gradecutoff model for a

1. Introduction. The tonnage, average grade, and cutoff are the basic parameters in mineral resource assessments and mining operations. Research on the inherent relationships between the tonnage, average grade above cutoff and the cutoff has been carried out for decades on the scale of an ore camp, district or ore province.

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

CHAPTER 8 Stripping Ratios, Pit Limits & Cutoff Grade Optimization Dr. Teuku Andika R Putra USM 2014 Stripping Ratios The stripping ratio (SR) refers to the amount of waste that must be removed for a given quantity of ore in open pit mining.

### Forecasting the gradetonnage curves and their uncertainty

Forecasting the gradetonnage curves and their uncertainty at the Mehdiabad depositYazd, central Iran S.A. HoSSeini1, o. ASgHAri1, X. emery2,3 and 2,3m. mAleki 1 Simulation and Data Processing Laboratory, School of Mining Engineering, College of Engineering, University of Tehran, Iran

### Cutoff grade estimation QueensMineDesignWiki

Feb 17, 2018 · The tonnage/grade curve provides two key characteristics for the deposit under investigation. Firstly, the blue line represents the cumulative tonnage (y1axis) of all blocks with grade

### grade tonnage curve in mining ekhayawhiteriver

Using Technological Advances to Improve SRK Consulting. Many mining companies are not aware that several methods exist to predict and quantify the impact on gradetonnage curves of a change in mining selectivity.

### Porphyry Copper Deposits of the World: Database And

Porphyry Copper Deposits of the World: Database And Grade and Tonnage Models, 2008 By Donald A. Singer1, Vladimir I. Berger1, and Barry C. Moring1 OpenFile Report 20081155 2008 U.S. Department of the Interior

### GradeTonnage Curves, OreWaste Selection and Planning

SYNOPSIS — This chapter will ask many questions and give a few answers s purpose is to show how to correctly set a gradetonnage 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.

### Forecasting the gradetonnage curves and their uncertainty

Forecasting the gradetonnage curves and their uncertainty at the Mehdiabad depositYazd, central Iran S.A. HoSSeini1, o. ASgHAri1, X. emery2,3 and 2,3m. mAleki 1 Simulation and Data Processing Laboratory, School of Mining Engineering, College of Engineering, University of Tehran, Iran

### What Does the Grade of a Gold Mine Refer To? Investopedia

The highestgrade 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

### Risk quantifiion in gradetonnage curves SpringerLink

R. Dimitrakopoulos, and M. B. Fonseca, "Assessing risk in gradetonnage curves in a complex copper deposit, northern Brazil, based on an efficient joint simulation of multiple correlated variables," in: Appliion of Computers and Operations Research in the Minerals Industries, South African Institute of Mining and Metallurgy (2003).

### Stripping ratio Wikipedia

In mining, stripping ratio or strip ratio refers to the ratio of the volume of overburden (or waste material) required to be handled in order to extract some tonnage of ore. For example, a 3:1 stripping ratio means that mining one tonne of ore will require mining three tonnes of waste rock.

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

CHAPTER 8 Stripping Ratios, Pit Limits & Cutoff Grade Optimization Dr. Teuku Andika R Putra USM 2014 Stripping Ratios The stripping ratio (SR) refers to the amount of waste that must be removed for a given quantity of ore in open pit mining.

### Grade and Tonnage Relationships Among Copper Deposits

Three types of copper depositsporphyry, stratabound, and massive sulfideare described, and the distributions of tonnages and grades for 267 deposits are compared with normal and lognormal frequency distributions. The relationships between grades and tonnages are analyzed by examining the correlation coefficients of these variables.

### Tonnagecutoff model and average gradecutoff model for a

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

### SedimentHosted Gold Deposits of the World—Database

(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

### CAREFUL OF THE GRADE/TONNAGE TRAP!!

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

### crusher machine gradesgrade afvalcontainersco

grade tonnage curve in mining . Tonnagecutoff model and average gradecutoff model for a tonnage and average grade by plotting the cumulative tonnage against the grade. Turcotte (1997) further developed a tonnagegrade model, which results in a fractal relationship between tonnage and grade, Get price

### Selection and GradeTonnage Relationships SpringerLink

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 gradetonnage curve, we must be able to define clearly the relationships existing between estimates and the corresponding true values.

### Design of Surface Mine Haulage Roads A Manual

and descent grade can be found for a known truck weight by reading vertically along the maximum permissible stopping distance limitation line. At grade curve intersections, read left to find velocity. An example is given on the graph for less than 100,000 pound trucks (fig. 1). Figures 1 through 4 have been based primarily on mathematic

### Cutoff grade determination for the maximum value of a

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 cutoff grades in terms of present value curves for different segments of a mining operation. Keywords: cutoff grade, Net Present Value, gradetonnage curve, balancing cutoff grade, mining, processing

### grade tonnage curve in mining deniseohlson

mining where the ore grade is highly variable and by selecting out only high grade areas to mine a reduction in cost can be, of the MMD grade tonnage curves would be the mining method and the grade distribution The next step is to.

### Mineral resource estimation Wikipedia

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.

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