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·IFRIC 20 considers when and how to account separately for the benefits arising from the removal of mine waste materials overburden to gain access to mineral ore deposits as well as how to measure these benefits both initially and subsequently IFRIC 20 was issued on 19 October 2011 and applies to annual periods beginning on or after 1 January 2013
·stripping ratio is the main tool to manage the mining mode at pre set production rate of the open pit In most cases graphic representation of the stripping mode is a broken line
·To address the problem of excessive local secondary stripping between adjacent mining areas in open pit mines caused by internal row raising a multivariate function was fitted to the model of the main mining seam of Zhundong open pit coal mine in Xinjiang and the different locations of the end gang of the second mining area were divided into multiple
·body beyond this maximum stripping ratio will have to be left or mined underground Example 1 A seam of coal has a density of t/m3 and is m thick It is covered by 27 m of shale which has a density of t/m3 Calculate the stripping ratios Solution † Volumetric stripping ratio = 27/ = m3 of overburden per m3 ore
Standard stripping ratio the ratio of overbudern OB to be removed to the mineral to be produced during the whole project life Suppose in an opencast mine 20 lakh CuM OB will be removed during the life time suppose 15 years against the production of 10 lakh Te of coal the standard stripping ratio will be
·The profit function can also be formulated in unit values per ton or cubic meter of ore by assigning a unit profit function L ′ $/h which is given by 2 L ′ = T U V − M − E R − B − F P In all these variables there are two geological characteristics which have great importance the stripping ratio R and the grade of ore is therefore essential to determine
·The Chenbaerhuqi coal field in Hulunbuir City Inner Mongolia Autonomous Region of China is where the Baorixile open pit coal mine is situated as shown in Fig 2 7 mine s external
The concept of the strip ratio is pivotal in the domain of open pit mining serving as a barometer for the economic viability of a mining operation It is the mathematic expression of the volume of overburden or waste material required to be handled in order to extract a unit volume of ore
·The stripping ratio increases when mine goes deeper while the amount of reco vered ore remains constant in inclined deposits In this instance the amount of overburden increases as well
·The mining and stripping line is arranged along the ore body trend and moves perpendicular to the ore body trend Fig 4 The pioneer cut of the longitudinal cut mining can be excavated along the final boundary of the hanging wall or footwall of the ore body to form a single side working slope and then advance to the footwall or hanging wall
·Productivity of an excavator and dump truck during stripping and ore extraction The productivity is expressed by the ratio of output and input During the calculation of the fleet in Surface Mining the number of loaders and its productivity must be determined first whereas the truck productivity must be calculated based on the
Other articles where stripping ratio is discussed coal mining Choosing a mining method calculated 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…
In coal mining Contour strip mining If the break even 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
Two major technical constraints involved in the determination of such schedule are i the feasible combinations of ore and waste production stripping ratio and ii the ore production rate that meets the mill feed requirements Optimization methods have long been used to improve mine design and life of mine production schedules [1 12]
·determine the stripping ratios in sections This paper introduces a Ômathematical pathÕ and uses 0Ð1 matrices in order to calculate stripping ratios The proposed method can be used in one of two ways i manual calculation of the stripping ratio that is important in field works; and ii use of computer facilities when
·The mining parameters depend on the open pit mining technology The basic parameters include bench height h bench slope angle α mining belt width A and bench width B into
The stripping ratio SR refers to the amount of waste material that must be removed for a given amount of ore The Instantaneous Stripping Ratio ISR is the stripping ratio for a given push back where a tiny slice of material ore and/or waste is removed from a pit wall This section presents the ISR calculation for a steeply pitching
·Making full use of the rock arch effect and reasonably selecting a suitable mining and retaining ratio for strip mining in sedimentary bauxite can effectively improve the resource recovery rate and reduce in the support cost of stope In the current study we investigated the overlying strata of the goaf at a sedimentary bauxite mine in Shanxi China
·Research on boundary optimization of adjacent mining areas in open pit coal mine based on calculation of sectional stripping ratio Based on the above formula the mining width should be less
MINE 202 SURFACE MINING CHAPTER 2 UNIT OPERATIONS IN MINING Lecture Objectives At the end of this lecture you will the sequence of unit operations the main and auxiliary equipment used for loading and haluage how to calculate stripping ratios the stipping ratio models how to calculate cut off grade the major
·The results of mining and geometric analysis showed that to ensure the production of 1500 thou t of coal with an average stripping ratio of 8 m 3 /t annually it will be necessary to remove 12000 thou m 3 of overburden including direct dumping—up to 3 thou m 3 truck and shovel—up to 7 thou m 3 and hydraulic method—up to 3 thou m 3
·The main topics that will be discussed in this chapter will include an introduction into the general features of open pit mining ore body characteristics and configurations stripping ratios and
·Various authorities use the term cut off for stripping ratio or for mineral grade hence cut off grade In general the following are used Cut off the limit of economic working involving stripping ratio grade G variable costs Then; the Sc ratio break even stripping ratio and economic stripping is given from
