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Grade/Tonnage Curves and Optimization of a Mining

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. Not only do the reserves depend on the geological in situ resources, they also...

Grade Tonnage Curves and Change of Support

How to generate theoretical grade tonnage curves at any given block size easily using the Discrete Gaussian Model for change of support. This example has loaded data from a gold deposit and this domain has a declustered average grade of 3.35 g/t and exhibits the classic positive skewed distribution associated with gold grades.

Uncertainty assessment of coal quality-tonnage curves

2020-10-22  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 Tonnage Graphs Leapfrog

2018-6-26  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. Leapfrog Geo can display multiple grade tonnage curves on one graph.

Understanding Cut-Off Grade 4 (Tonnage, Grade, and

2018-2-17  The tonnage and grade curves can be adjusted to account for several modifying factors to approximate or estimate the potentially mineable material available at various cut-off grades. Extreme

Grade Tonnage Curve Summary

2012-12-14  Figure 5 Grade-tonnage tables and graphs for indicated and inferred resources This shows conceptual grade-tonnage relationships only and is derived from Inferred and Indicated Resources for which economic viability of realising tonnage above any given grade cut-off has not been assessed at this time. 0.00 1.00 2.00 3.00 4.00 5.00 6.00-500,000.00

Geology Geostatistics Datamine

The module produces grade tonnage curves from sample data, as well as alternative grade tonnage curves and representative models for different SMU sizes. The workflow user interface takes the user through the steps of carrying out a study and interpretation of the results is greatly assisted by the integration with Studio’s charting and

Calculation of Ore Tonnage & Grade from Drill hole

2021-1-4  Metallurgical ContentORE RESERVE CALCULATIONSMINERAL ORE RESERVE Case 1MINERAL ORE RESERVE Case 2MINERAL ORE RESERVE Case 3 The usual method of sampling mineral deposits is to drill holes and assay the sludge or core. Though the results thus obtained may not represent the true average value of the deposit, it is on these results that estimates of practically all

Coal 2008-2021 Data 2022-2023 Forecast Price

The coal market started January on a relatively high note, with futures trading around $80 per tonne amid expectations of higher restocking levels and a boost in seasonal demand. However, coal production and consumption continue to fall globally, with 2021 set to follow the trend. A push to reduce the development of coal mines and growing pressure from investors to move away from fossil fuels

(PDF) Assessment of uncertainty in grade-tonnage

The grade-tonnage curves for each realisation are plotted and compared with the generated one by the kriging estimate. geology and exploration, ground control, coal cleaning systems, drilling

(PDF) The impact of the compositional nature of data

Quantitative comparison of tonnage grade curves of the approaches revealed that at cut-offs of 31% for ash and 52% for fixed carbon, nearly 5 and 3 million tons of coal are being considered as

(PDF) Global Grade-and-Tonnage Modeling of

This contribution presents models of grade and tonnage distribution of various uranium deposit types and sub-types. A p-value derived from the Kolmogorov-Smirnov test is used for evaluating the

methods of calculating tonnage in mining

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

(PDF) A new generic open pit mine planning process

2020-11-12  The grade-tonnage curves for each realisation are plotted and compared with the generated one by the kriging estimate. The MAF approach proves

Tonnage on the Curve PRRTHS Discussion Web

A tonnage train has more than 100 ton per operative brake and a fast train has less than 100 ton per operative brake (operative brake meaning car). As for eastbound coal trains these days 130 is usually the limit. That's about 18,000 ton. for use on the mountain run between Osceola Mills and Tyrone on account of heavy grade and curves

Grades and curves Trains Magazine

Because of the resistance produced by curves, they pose an added difficulty when located on grades. To keep the combined resistance of grade and curve from overwhelming trains, grades are often "compensated" by being reduced on curves so resistance remains constant. A grade so treated would be termed, say, "1.7 percent, compensated."

Mining Valuation Lesson: Cut-Off Grade Theory and

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.

Vulcan Geology Modules Maptek

2016-6-30  • Inverse distance grade estimation. • Creation of customised reports including grade tonnage curves. • 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.

Coal Markets Energy Information Administration

Average weekly coal commodity spot prices dollars per short ton; Week ending Week ago; change; Central Appalachia 12,500 Btu, 1.2 SO 2: Northern Appalachia 13,000 Btu, 3.0 SO 2: Illinois Basin 11,800 Btu, 5.0 SO 2: Powder River Basin 8,800 Btu, 0.8 SO 2: Uinta Basin 11,700 Btu, 0.8 SO 2: Source: With permission, S&P Global Note: Prompt quarter delivery coal prices by each region are

grade tonnage curves coal Grinding Mill China

grade tonnage curves coal [ 4.9 4518 Ratings ] The Gulin product line, consisting of more than 30 machines, sets the standard for our industry. We plan to help you meet your needs with our equipment, with our distribution and product support system, and the continual introduction and updating of products.

methods of calculating tonnage in mining

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

Grades and curves Trains Magazine

Because of the resistance produced by curves, they pose an added difficulty when located on grades. To keep the combined resistance of grade and curve from overwhelming trains, grades are often "compensated" by being reduced on curves so resistance remains constant. A grade so treated would be termed, say, "1.7 percent, compensated."

Introduction to Mineral Deposit Models USGS

GRADE-TONNAGE MODELS. Estimated pre-mining tonnages and grades from over 3,900 well-explored, well-characterized deposits were used to construct 60 grade-tonnage models. Where several different estimates were available for a deposit, the estimated tonnages

Tonnage on the Curve PRRTHS Discussion Web

A tonnage train has more than 100 ton per operative brake and a fast train has less than 100 ton per operative brake (operative brake meaning car). As for eastbound coal trains these days 130 is usually the limit. That's about 18,000 ton. for use on the mountain run between Osceola Mills and Tyrone on account of heavy grade and curves

Maptek Forge Vulcan 9 modelling tools

The grade-tonnage curve output by change of support represents change as a proportion, not actual tonnes. To report tonnage, the tonnes from implicit modelling can be combined with grade-tonnage curves from support analysis. This results in a potential range of size and grade for the deposit based on the current information.

tonnage factor iron ore pdf rijschoollab.nl

Cut off grade determination for the maximum value of a . tonnage milled processed or marketed in one time period typically a year Thus the term reduces to a rand per ton term (exactly the same units as the rest of the terms in the equation) and is simply an additional cost attributable to each ton of ore in the same way as any other costs So we have the result that the maximum present value of a

Planning for Uncertainty E & MJ

2020-4-8  This is accomplished by defining grade bins based on the spatial distribution of the ore and grade tonnage curves,” he said. “Advanced mine planning software can define a ‘high-grading’ strategy that brings high-grade material to the processing facility earlier in the mine life while balancing the total material mined, and therefore the

Vulcan Geology Modules Maptek

2016-6-30  • Inverse distance grade estimation. • Creation of customised reports including grade tonnage curves. • 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.

Coal Markets Energy Information Administration

Average weekly coal commodity spot prices dollars per short ton; Week ending Week ago; change; Central Appalachia 12,500 Btu, 1.2 SO 2: Northern Appalachia 13,000 Btu, 3.0 SO 2: Illinois Basin 11,800 Btu, 5.0 SO 2: Powder River Basin 8,800 Btu, 0.8 SO 2: Uinta Basin 11,700 Btu, 0.8 SO 2: Source: With permission, S&P Global Note: Prompt quarter delivery coal prices by each region are