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Transcribed image text Problem 6.2 (from page 178, Introductory Mining Engineering) Calculate the maximum stripping ratio (SR.max = ?) and the overall stripping ratio (SRo = ?) for the open pit shown in Figure 2. given the following conditions Stripping Allowance 1.50/ton Stripping Cost 0.25/ton Pit Slope B = 65° Berm at top of ore a = 30 ft Surface inclination 25
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SOLUTION Breakeven cutoff grade = Mining cost/t ore concentrating cost per tonne ore (Metal price per tonne SRM costs per tonne metal) x recovery Mining cost per tonne ore = Mining cost per tonne material x (1 stripping ratio) Mining cost per tonne ore (1.47(11.5) = 3.68 Concentrating cost per tonne ore =
ChatJun 06, 2010· a. SR measures the amount of waste that needs to be removed to get an amount of ore, just as we mine it. Note the amount! b. This will differ depending on time span under consideration. * Initial studies (feasibility) overall stripping ratio. * Current month incremental stripping ratio.
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Mar 02, 2010· The ISR for these three strips is calculated as ISR S 1 = 45 40 = 1.125 ISR S 1 = 50 40 = 1.250 ISR S 1 = 55 40 = 1.375. This simplified example has illustrated how the length of waste and ore sections will impact the ISR. In a mine, there will be differences in the density of the ore and waste materials.
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In surface mining, stripping ratio or strip ratio refers to the amount of waste (or overburden) that must be removed to release a given ore quantity. It is a number or ratio that express how much waste is mined per unit of ore. The units of a stripping ratio can vary between mine types. For example, in coal mining the stripping ratio is commonly referred to as volume/weight. Whereas in metal mining, stripping ratio is unitless and is expressed as weight/weight. A stripping ratio can be expressed as a ratio or as a number.
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Mar 01, 2019· Overburden handling has important impacts on surface mining projects and has to be carefully planned considering both mining activities and site rehabilitation , .Overburden handling activities start at the beginning of the mining project, when a huge amount of material from initial underground development or stripping is removed for site preparation , .
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Jun 30, 2021· This is the formula of stripping ratio Stripping Ratio BREAK EVEN STRIPPING RATIO Or, QUARRIABLE LIMIT The ratio of mineral bed thickness to the Overburden thickness for Mining of coal is as follows Mechanized Quarrying with shovel dumper 14 to 5; with dragline 18 to 10; bucket wheel excavator 13 to 4 And with
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Other articles where Stripping ratio is discussed coal mining Choosing a mining methodcalculated with the aid of stripping ratios, which represent the amount of waste material that must be removed to extract a given amount of coal. Stripping ratios can also consider the selling price of coal, and a certain minimum profit can be added to the total cost of producing and
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mining. The breakeven stripping ratio is a function of ore value and the costs involved. If the breakeven stripping ratio remains favourable, further cuts into the hillside will be made. Otherwise, if there are sufficient reserves under the knob of the hill, the coal may be recovered by underground mining or by augering.
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Stripping ratio is a term that is derived from the mining industry and is used in reference to the openpit mining process. The stripping ratio method of calculating the profitability of the mining procedure is commonly used in the ore or coal mining process. In relation to its application in the mining of ore, the utility of the stripping ratio is the determination of the approximate ratio of waste material that must be moved in order to reach a certain ratio of ore.
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Calculation of Boundary Stripping Ratio Errors at the Stage of Quarries Designing. Selyukov, Alexei. ; Rybár, Radim. Abstract. The open pit mining method of solid minerals extracting is widely used both in Russia and in the whole world, and sets a general direction of mining industry development as
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coal mining stripping ratio Gold Mining Equipment,Gold coal mines to guide mining project evaluation to find the ATC in open pit coal mines. High stripping ratio,
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The Coal Area Strip Mine Formula Strip Ratio = OB Thickness (in ft) * 11.11/ Coal thickness in inches Assumes coal is 80 lbs/ft^3 (good for bituminous) Area Strip Mine Geometry Geologic Stripping Ratio no accounting for rehandle or less than 100% coal recovery Your Turn Use What You Have Learned About Calculating Stripping Ratios for Strip Mines and Break Even Limits to Determine the Size of a Coal Reserve
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The amount of ore uncovered is A4 A4 = 100 * 25 100 * 25 = 5, ft2 2A3 = 125 * 125 100 * 100 = 5,625 ft2 The instantaneous stripping ratio is 5,625 SR (instantaneous) = = 1.125 5, The overall stripping ratio with bench 7 removed is 15,625 SR (overall) = = 0.48 32,500 Bench 8 With mining of bench 8, another 5, ft2 of ore (A6) is removed.
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The Mine Engineer application is an easytouse mine application, offering tools for the calculation of loading / hauling tools, mine road calculations, production targets, Cut of grade, Bers, Avability units, Ore / Coal Stripping Ratios, HM Unit records, Retase Units, Usage Solar and Mining Book Reading. Mining Engineer application makes users
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Mulliplescam mining is a very important phase of the stripping industry in the United States today. As in the casc of conventional stripping, multipleseam slripmiuing is classified either as area or contour mining .. Area stripmining is practiced on relatively flat terrain. A 'box cut' is made
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AVERAGE STRIP RATIO Total waste divided by total ore within the ultimate pit. CUTOFF STRIPPING RATIO Costs of mining a ton of ore and associated waste equals to net revenue from the ton of ore.
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Apr 04, 2016· Determine the Stripping Ratio of the ore section (green zone) shown below We know; SR = Waste/Ore, therefore; SR = 2500/5 = 12 (i.e. 0.5) (i.e. one unit of waste is removed to recover 2 units of ore)
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Apr 30, 2016· The strip ratio (SR) is the simplest measure of mining efficiency. Defined as the weight of overburden (or waste ore) divided by the weight of oil sands ore, a strip ratio of 2 is considered high but feasible if the ore grade is high enough. A better measure of mining economics is the TVBIP ratio.
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.pwc \mining Financial reporting in the mining industry International Financial Reporting Standards 6th edition
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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 is considered to be ore, while material below this grade is considered to be waste. Although in a variety of units can be used, the cutoff grade is usually expressed as
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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 is considered to be ore, while material below this grade is considered to be waste. Although in a variety of units can be used, the cutoff grade is usually expressed as
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Jun 06, 2010· a. SR measures the amount of waste that needs to be removed to get an amount of ore, just as we mine it. Note the amount! b. This will differ depending on time span under consideration. * Initial studies (feasibility) overall stripping ratio. * Current month incremental stripping ratio.
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The Mine Engineer application is an easytouse mine application, offering tools for the calculation of loading / hauling tools, mine road calculations, production targets, Cut of grade, Bers, Avability units, Ore / Coal Stripping Ratios, HM Unit records, Retase Units, Usage Solar and Mining Book Reading. Mining Engineer application makes users
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Jan 30, 2021· In surface mining, stripping ratio or strip ratio refers to the amount of waste (or overburden) that must be removed to release a given ore quantity. Whereas in metal mining, stripping ratio is unitless and is expressed as weight/weight. A stripping ratio can be expressed as a ratio or as a number.
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company generally is mining a ratio of waste material to mineral deposits that is different from the stripping ratio. Refer to Exhibit 046A for an illustration of a cross section of a mine and calculation of a deferred stripping ratio. For each period, the actual stripping ratio is compared to the lifeofmine stripping ratio.
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The program will first determine the lowest Instantaneous stripping ratio in the calculation area. The program will then determine in which direction the stripping ratio increases the least. If mining were to start in the area of lowest stripping ratio and then move one grid node in the direction of least increasing stripping ratio, the
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Contour surface mining takes advantage of the low strip ratio coal reserves adjacent to the outcrop. Contour mining equipment includes a drill, loader, bulldozers, and trucks. The steps in contour mining begin with drilling and blasting a triangle shaped portion of overburden (in cross section) above the coal to be mined.
ChatOct 30, 2018· Calculating stripping ratios. At their most basic, strip ratios can be calculated by dividing overburden thickness by ore thickness. For example, an overburden thickness of 100 meters and an ore
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