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#### Cut-off grade determination for the maximum value of a

mining operations. The method has been couched in mathematics that detracts from its grade-tonnage curve, balancing cut-off grade, mining, processing, marketing. * School of Mining Engineering, University of the Witwatersrand, South Africa. in their calculation of royalty, which is defined as the

#### Mining method selection by multiple criteria decision

appropriateness of a mining method for a particular ore deposit have been in use for some time. In 1981 Nicholas suggested for the first time a numerical approach for mining method selection. The Nicholas methodology follows a numerical approach to rate different mining methods based on the rankings of specific input parameters.

#### Valuation Methods Mineral resources

has focused on oil and gas. Would the methods for, say calculating the resource rent, valuing the stocks, etc., be applicable also for other mineral resources? 9. In line with these, is the NPV the most appropriate method in valuing resources? What about the other valuation methods? Mineral Resource Valuation Approaches and Methods 10.

#### ore dilution and ore recovery - SlideShare

It has been noted that instead of utilizing labour intensive mining methods to high tonnage bulk mining has decreased the ability to control ore recovery. In a practical underground and open pit setting, the ore recovery is affected by three main factors as follows: Ore wedges located at the top and bottom sills of the panel are unable to be

#### METHODS OF ORE RESERVE ESTIMATION_EXAMPLE - Basic Mining

Aug 18, 2019· In conclusion, the tonnage and grade determined using the two methods is approximately the same. Avoca methods of mining Gideon Gipmai Yowa (August, 2017) Senior Instructor, Mining Eng. Dept., PNG University of Technology. In addition, there may be variation in certain methods of calculation, application and interpretation of the

#### Economic Filters for Evaluating Porphyry Copper Deposit

by application of a feasible mining method and provide a positive return on investment. Engineering cost modelAn engineering-based analysis of capital and operating costs associated with an industrial operation. Grade-tonnage modelThe frequency distributions and relations of tonnage and ore grades of a group of well-

#### Tonnage Calculator Hedrick Industries

You will need the length, width, and depth of your project space to be able to get your estimated tonnage calculation. Our calculator provides an average unit weight per product and should only be used for estimating purposes. The weight of each product will differ

#### "Methods for calculating the minimum amortization tonnage

Therefore, amortization tonnage can be expressed as a function of mining rate. The amortization tonnage is calculated for a series of mining rates, one of which will indicate a minimum tonnage. Part II describes a procedure for calculating the optimum mining rate to obtain maximum present value of an ore body, when mining rate is the only variable.

#### Methods for calculating the minimum amortization tonnage

mining methods may be equally applicable ( each . with . different recoveries and costs) and that the absolute maximum mining rate for each method is not necessarily the best, then the complexity of the problem becomes calculate a . minimum amortization . tonnage, or gives . a .

#### MINING AND EARTHMOVING - Holt

Sand cone method Oil method Balloon method Cylinder method All these except the nuclear method use the fol-lowing procedure: 1. Remove a soil sample from bank state. 2. Determine the volume of the hole. 3. Weigh the soil sample. 4. Calculate the bank density kg/BCM (lb/BCY). The nuclear density moisture gauge is one of the

#### Mining Units Converter Geology for Investors

Oct 17, 2019· For reference, weve also included a list of the most common mining unit conversations. 1 carat (ct) = 0.2 grams (g) 1 troy ounce = 31.1034768 grams 1 ounce = 28.3495 grams 1 ppm = 1 g/t (grams per tonne) 1 kilogram (kg) = 1,000 grams 1,000 kg = 1 tonne (t) 1 lb = 0.454 kg 1 kg = 2.20 pounds (lb) 1 ton (US or "short ton" T) = 2,000 lb = 907.185 kg 1 tonne (t) = 2204.62 lbs = 1.10231

#### CLASSICAL METHODS OF ORE RESERVE ESTIMATION - Basic

Proceed by determining the surface are of the polygon by using geometric functions of the resulting polygon. The volume is determined by multiplying the surface area with the average depth. Tonnage is then determined by multiplying the volume with the tonnage factor (specific gravity). 1.

#### (PDF) COST ESTIMATION FOR OPEN PIT MINES: TACKLING COST

"Total Mining cost per ton ($/t)" : A method is presented to calculate the cost of uncertainty in a production schedule based on deviations from the target production. A mixed integer linear

#### Valuation of Aggregate Operations for Banking Purposes

Crushed stone was $9.78 per ton varying from roughly $4.00 per ton to nearly $20.00 per ton depending on location and grade of material ! Sand and gravel was $7.65 per ton - varying depending on location and grade from $3.50 per ton to more than $15.00 per ton loaded on trucks at the mine.

#### محمود ابراهيم محمد ابوشوك جامعة الملك عبد العزيز

In the metric system, the tonnage factor is the specific gravity of the ore. Probably the most accurate method of determining specific gravity of an ore is to calculate an average specific gravity using the specific gravities of individual minerals (Table 4), provided the relative percentages of ore minerals present are accurately known.

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

Feb 17, 2018· The tonnage and grade curves can be adjusted to account for several modifying factors to approximate or estimate the potentially mineable material available at

#### Calculation of Ore Tonnage & Grade from Drill hole Samples

Mar 19, 2017· The standard method of making these estimates is to find the cubic contents of triangular prisms, in the apexes of which the drill holes are placed, by multiplying the surface area by the average depth of the ore in the three drill holes and then multiplying the cubic contents by the specific gravity of the ore or rock to find the tonnage.

#### Estimation of the potential production rate

The half vertical tonnage rule of thumb is used in steeply dipping mechanized vertical deposits. The rule is similar to Taylor's rule as it is based of tonnage, however it uses the average tonnage divided by depth instead. The rule is as follows: Alternatively a factor of 1/3 may be used instead of 1/2.

#### Chapter 8 BLAST DESIGN

The economic analysis of the use of explosives is an important part of blasting operations in mining and construction. Explosives are energy, and the efficient use of this energy is a major factor in keeping rock blasting costs under control. High-energy explosives enhance fragmentation, which ultimately produces a positive effect on production

#### MINE PROJECT EVALUATION TECHNIQUES

METHODS of cash inflows and the present value of cash 2.1 Discounted Cash-Flow analysis outflows. NPV analysis is sensitive to the One of the most common methods to evaluate a mining project is the DCF method. In 1995, Bhappu and Guzman surveyed 20 mining companies located in the USA, Canada, Mexico, Australia, and

#### Mineral resource estimation - Wikipedia

Mineral 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 used for different scenarios dependent upon the ore boundaries, geological deposit geometry, grade variability and the amount of time and money available.

#### What is TKPH and why is it useful for mining operations

TKPH calculation methods vary slightly between tyre manufacturers. The general concept is to represent TKPH as (Tyre Load) x (Average Speed). For example, Michelin has a calculation method that applies corrections to the Site Operational TKPH of the vehicle whilst Bridgestone applies corrections to the Rate TKPH of the tyre.

#### Mining Valuation Techniques - P/NAV, P/CF, EV/Resource

The best way to value a mining asset or company is to build a discounted cash flow (DCF) model that takes into account a mining plan produced in a technical report (like a Feasibility Study). Without such a study available, one has to resort to more crude metrics. Here is an overview of the main valuation methods used in the industry:

#### Handbook for Methane Control in Mining

This handbook describes effective methods for the control of methane gas in mines and tunnels. It assumes the reader is familiar with mining. The first chapter covers facts about methane important to mine safety, such as the explosibility of gas mixtures. The second chapter covers

#### methods of calculating tonnage in mining

methods of calculating tonnage in mining. Cubical opening method dig up a pit of mxmxm size and weight all the material this weight is tonnage factor for sulphide ore deposit at initial exploration this method is not applicable in case of iron ore , limestone, rock phosphate is applicable in the mining stage normally bulk density is determined by this method conventional density

#### Mining Valuation Lesson: Cut-Off Grade Theory and Practice

Dec 04, 2011· 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.

#### Mining Cost Service - Costmine

Mining Cost Service is the industry standard reference for Mining Cost Estimation. This system places cost estimating data at your fingertips with conveniently indexed information to make your cost estimates faster, easier, and more credible. Monthly updates assure that

#### Metal Value per Tonne - How You Can Determine the Mineral

Although mineral values are often expressed in tonne, sometimes they are expressed by ton as well. As 1 ton equals 907.18474 kilograms and 1 tonne equals 1,000 kilograms, just remember the difference between tonne and ton is approximately 10%

#### METHODS OF ORE RESERVE ESTIMATION_EXAMPLE - Basic

Aug 18, 2019· In conclusion, the tonnage and grade determined using the two methods is approximately the same. Avoca methods of mining Gideon Gipmai Yowa (August, 2017) Senior Instructor, Mining Eng. Dept., PNG University of Technology. In addition, there may be variation in certain methods of calculation, application and interpretation of the

#### Topic 5: Mining Methods-Part I-Surface mining

Topic 5: Mining Methods-Part I-Surface mining 1. Topic 5: Mining Methods Part I-Surface mining Hassan Z. Harraz [email protected] 2010- 2011 Prof. Dr. H.Z. Harraz Presentation This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors.

#### Mineral Appraisals: What is the Value of a Quarry or Mine?

Capital includes the mining machinery and equipment, plus the processing plant, to produce a finished product. The raw ore is extracted by surface (open pit) or subsurface (underground) mining methods; processed to a marketable state; and delivered to the market. Labor includes all human effort, abilities and skills, Calculating Tons in the

#### A METHOD OF DETERMINING THE VOLUME AND TONNAGE

ton for hay that had been stacked only a few days and 350 to 380 cubic feet for hay that had stood two months or more. The United States Department of Agriculture, during the*years 1910 to 1912, carried on some investigations for the purpose of deter- mining the

#### DESIGN OF SURFACE BLASTS- A COMPUTATIONAL APPROACH

The empirical method continues to be the most common way to calculate the design parameters. Nevertheless, an integration of empirical method, computer modeling and mining widely used in the coal industry for more production, where a coal seam is completely large surface mines with million ton production targets are established. The

#### Reserve Estimation Tonnage Density

Reserve Estimation - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File () or view presentation slides online. Ore reserve estimation techniques by cross section method. computation of mineralised zones and true thickness of mineralisation and grade of ore along with metal content. diagrams and formulas for calculation of ore resource.

#### Tailings - Wikipedia

Tailings are the materials left over after the process of separating the valuable fraction from the uneconomic fraction of an ore.Tailings are distinct from overburden, which is the waste rock or other material that overlies an ore or mineral body and is displaced during mining without being processed.. The extraction of minerals from ore can be done two ways: placer mining, which uses water

#### Belt Conveyors for Bulk Materials Calculations by CEMA 5

5. Convert the desired tonnage per hour (tph) to be conveyed to the equivalent in cubic feet per hour (ft3/hr). (ex. 1000 tph x 2000 / 60 = 33333 ft3/hr) 6. Convert the desired capacity in cubic feet per hour to the equivalent capacity at a belt speed of 100 fpm. (ex. Capacity (eqiuv) = 33333 x (100 /

#### RESOURCE/RESERVE REPORTING STANDARDS FOR MINERALS

Mining Methods ¾Surface mining (e.g. open cut, strip mining, quarry) ¾Underground mining (e.g. block caving, open stoping, cut-and-fill, hand-held) ¾An Ore Reserve is an estimate of the tonnage and grade that is expected to be delivered to the mill or treatment plant ¾It is

#### Design methodology for underground - Mining and Blasting

applied in mining methods such as bench stoping, sub level open stoping and SLC including undercut blasting and drawbell blasting in the case of block and panel caving methods. All of these methods have been fully described in Refs. 5 and 12. Ring design terminology In this paper, the following terminology is used:

#### Ore Reserve Estimation Method

The tonnage in each block of ore is, of course, the volume in cubic feet divided by the cubic-feet-per-ton factor (or similar calculations for metric units). When it comes to actual mining, it often happens that the tonnage is greater and the grade of ore lower than estimated. This often is due

#### Coal mining - Choosing a mining method Britannica

Choosing a mining method. The various methods of mining a coal seam can be classified under two headings, surface mining and underground mining. Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods, and the choice of which method to use in extracting a coal seam depends on many technological, economic, and social factors.

#### Toward Pillar Design to Prevent Collapse of Room-and

Room-and-pillar mining accounts for a significant portion of the total mineral production in the United States As shown in table 1, well in excess of $6 billion worth of mineral commodities are produced each year by this method. A substantial portion ($3.55 billion) of coal production still comes from room-and-pillar mining. Metallic minerals

#### Grade Tonnage Curve: How Far Can It Be Relied Upon?

mining method economics With all the rigour to calculate a constrained (by the mining method) grade tonnage curve it is first necessary to calculate (estimate or simulate) the resources in blocks and then to simulate the mining method afterwards to obtain the minable reserves. The problem

#### Calculation of Volume and Tonnage of Ore Deposit

For the calculation of the volume and the tonnage of ore deposits there is a variety of available methods to choose from, each suited for a particular deposit. These methods fall into two categories: reserve calculation on the basis of cross-sections and on the basis of

#### (PDF) Surface Mine Design

Tonnage Fact or Calculation: The tonnage factor provides the mechanism for the conversion from the volume of ore to the weight of ore. In the English system, the

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