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. Read More
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 …
Elements that influence production stripping ratio include natural terrain and topography and geological conditions in the mining area, stripping sequence in the pit …
Determining Stripping Ratio _ Basic Mining Techniques - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Mining -open pit
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 ...
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 …
Surface mining; Classification of surface mining methods together with the desired parameters/ conditions suitable for their applications; Open pit mining; Classification of quarrying methods ...
Strip Mining. Strip Mining. Soraya Sadeghi, Nicole Mehdian, Dami Kim. What is Strip Mining?. Strip mining is the mining of ore or coal from an open mine. Process of Strip Mining. Coal stacked up in layers in Earth. Strip miners blow up a portion of the Earth using bulldozers and dynamites. 480 views • 13 slides
The ratio of coal to shale decreases from the base of each zone upwards. The basal zone (Zone 5) is an exception because of a more homogeneous distribution of coal and shale throughout this zone. ... In addition, Zone 1 (bench 13) is currently omitted from the mine plan due to its high-stripping ratio but can be used as a sweetener if it is ...
The room-and-pillar technique is a self-supporting mining method in which part of the ore is left unmined as pillars. To increase the mining efficiency, the pillars are later recovered partially or completely. This research aims at evaluating and comparing four methods of pillar recovery, namely, 'pocket and wing', 'open ending', 'split and fender', …
Estimation of Coal, OB & Stripping ratio Contd. Rough assessment is given below • Assuming Pit slopes of 450, the Quarry floor and Quarry surface are delineated • Volume of Coal & OB = Average area x Average depth - (A) • Average area = (Quarry surface area + Quarry floor area) / 2 • Average depth = (Minimum depth + …
Surface mining techniques include placer mining for deposits close to the surface, strip mining which removes overburden, and mountaintop removal which levels entire mountains. Underground mining uses drifts, slopes, or shafts to access deep materials. ... (MTR) is a relatively new form of coal mining that involves the mass …
Mining involves extracting economically valuable minerals and ores from the ground. There are two main types of mining: surface mining and subsurface mining. Surface mining removes mineral deposits found near the Earth's surface using open-pit, quarry, or strip mining techniques.
the limit of surface mining (maximum economic stripping ratio) is reached when the cost of removing the overburden is equal to or greater than the value of the coal. once the maximum stripping ratio is reached, mining will be abandoned or the mining method must be changed.
coal mining by private players in 2020 and first ever successful auction of commercial mining was launched by the Hon'ble Prime Minister on 18.06.2020 and concluded with allocation of 19 coal mines. Commercial coal block auctions are conducted in a two-stage online bidding process, which involves
sbm what is stripping ratio coal mining ppt13《()》1().doc 2017610&ensp·&ensp13《()》1() Northeastern university 14 spring 13 autumn,"mining science (2)" online homework 1 Exam time: 100 test time: Single topic selection Multiple choice True or false (10 questions in total,40 points.) what is …
strip mining. 2.1 Contour Stripping Coal seams and associated overburden can outcrop on the edges of hills and mountains. Figure 3 shows a cross-section of a typical contour mine plan. Contour surface mining takes advantage of the low strip ratio coal reserves …
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.
S tripping ratio or strip ratio refers to the ratio of the vol ume of overburden (or waste material) required to be handled in order to extract some volume of ore.
Coal mining operations use these large machines to remove coal reserves from underground coal seams. ... Throughout the split and rendering process, the roadways leave a six-to-ten-meter fender, or …
Coal Mining, Design and Methods of. Andrew P. Schissler, in Encyclopedia of Energy, 2004 2.3 Strip Mining. Strip mining is employed in coal reserves where the overburden is removed in rectangular blocks in plan view called pits or strips. The pits are parallel and adjacent to each other. Strip mining is fundamentally different from contour or area …
Mining Methods 14 Coal and tar sands operations typically involve moving large amounts of waste (often ... Notes: Strip Ratio Mining Methods 27 Mistakes are often made when …
Download stripping ratio and break even stripping ratio and more Lecture notes Mining Engineering in PDF only on Docsity! STRIPING RATIO AND BESR IN OPEN PIT MINING Cont. 2.2.2 Open pit mining …
surface mining methods; open pit planning and design; open pit terminology; stripping ratio; factors governing strip mining; calculation of overburden ratio; initial data collection checklist ...
What is Opencast Mining • Opencast mining is also known as Open pit mining, Open cut Mining, Surface or Strip Mining. • The coal upto economical depth will be excavated by OC Method. • The current operating depth of OC mines in SCCL is about 200m and SCCL proposed to operate OC mines upto a depth of 420m. Ex: MNG OC II …
Mining - Strip, Open-Pit, Quarrying: It has been estimated that more than two-thirds of the world's yearly mineral production is extracted by surface mining. There are several types of surface mining, but the three most common are open-pit mining, strip mining, and quarrying. These differ from one another in the mine geometries created, …
The economic stripping ratio used to define an economic mining block in an open pit coal mining situation is rationalised by considering the time value of money, and defining run of mine recovery and mining cost as dynamic variables dictated by the thicknesses, depths and number of seams within a mining block. The ratio is based on …
In general, during the initial stage of the mining, the stripping ratio is high. As mining progresses the SR decreases, reaching a minimum before increasing again with greater mining depth. At this point, the stripping ratio is a controlling factor in comparing the cost of mining by open pit versus underground methods. Slope Angle
Energy resources: Coal. ... Figure 28me of the geological factors that influence coal-mine planning and reserve assessment. The stripping ratio for the two seams in Figure 28 is less than 7:1 for most of the area to the NW of the fault: the two seams there are economic for surface working and can be considered as reserves.
Numerical Calculation of. Stripping Ratios. Average End Area from Topo. • Use a digitizer or Autocad Digitizing. Function. • 1700 ft Contour Area is 53.452,860 ft2. • sits directly above coal seam - half way. down to next …
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 …
A mining entity may continue to remove overburden and to incur stripping costs during the production phase of the mine. The material removed when stripping in the production phase will not necessarily be 100 per cent waste; often it will be a combination of ore and waste. The ratio of ore to waste can range from uneconomic low grade to
Stripping Ratio Coal Mining Comp - montagetapes.nl. Stripping Ratio Coal Mining Comp. The units for stripping ratios can vary and usually depends on the geological properties of the deposit and the commodity mined It can be expressed in tonnes t or cubic meters m 3Usually for coal cubic meters m 3 or tonnes t are usedHowever for hard rock …
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 2.1
every other mine and with selected international mines in order to identify the critical performance areas that need to be improved upon in order to make South African surface coal mines more competitive in the international market environment. On average, the South African surface coal mining industry recorded a lower stripping
Calculating Stripping Ratios for Irregular Geometries ©Dr. B. C. Paul Spring 2003 The problem of complex geometry • Many mines are not strip coal mines • Some hard to describe with cones and cylinders – Had conveniently level surface • Consider the Mountain Top Removal Operation Numerical Calculation of Stripping Ratios Average End Area …
A strip ratio, or stripping ratio, is an important measurement related to the open-pit mining process.Put simply, it represents the amount of waste material, also known as overburden, that must be ...