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In 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….
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 presentation clarified the technical and geological aspects of mining as well as significance of the stripping costs, especially in open pit mining. The main aspect of the presentation was treatment of waste and overburden. ... capitalise using a strip ratio ; Most IFRIC members thought that Alternative 3 was the conceptually right answer ...
surface mining methods; open pit planning and design; open pit terminology; stripping ratio; factors governing strip mining; …
By analyzing and comparing the stripping ratio, mining life of the district, fault influence, difficulty of transition connection in the mining districts, the convenience of transportation system ...
Stripping ratio is the ratio of the volume of waste rock stripped off to the volume of ore …
2.0 (a) Use the calculated cut-off grade for 1(a) (b) Assume a cut-off grade of 0.50% Cu Assume an even feed to the concentrating plant and calculate for (a) and (b) respectively: square4 Overall stripping ratio square4 Head grade square4 Marginal stripping ratio square4 Daily production of ore and waste square4 Annual production of copper metal …
Therefore, an optimized slope angle can significantly reduce the stripping ratio and construction costs, while ensuring safety. This study is based on the existing open-pit mining design. If a larger final slope angle is to be adopted, a comprehensive and meticulous analysis of the new final open-pit boundary is required.
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.
Figure 4.6a: Mining operating expenditure per total ROM ton . . 41 Figure 4.6b: Mining operating expenditure per total BCM moved . . 41 Figure 4.7: Productivity factors for mining countries surveyed . . 42 LIST OF TABLES Table 2.3.1: Potential participating South African Mining operations . 19
3.2.5: Instantaneous Stripping Ratio; 3.2.6: Maximum Allowable Stripping Ratio (SRmax) 3.2.7: Impact of Pit Expansion on Stripping Ratio; 3.2.8: The Concept of a Cutoff Grade; Module 3 Summary ; Module 4: Development; Module 5: Unit and Auxiliary Operations; Module 6: Explosives and Blasting; Matt B Practice; Module 7: Surface Mining
The main mining methods may be briefly classified as Strip Mining, Terrace Mining, and the Conical Pit Mining (next section). 8.1.1 Strip Mining. ... Most mine planning offices carry out reserves and stripping ratio calculations with a desk top computer or use charts relating mineral seam thickness, percentage recovery, ...
By analysing the factors influencing the economic stripping ratio of opencast mines, Liu Chuang et al. 7 established a model for the location of stripping, mining and dump works in opencast mines ...
After you calculate the average ore grade for the slice, you can use a grade - stripping ratio (g-SR) plot to determine the SR max associated with the determined average ore grade. Here is an example of a g-SR plot. Figure …
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 thickness of 50 meters would...
For example, an overburden thickness of 100 meters and an ore thickness …
The break-even stripping ratio is a function of ore value and the costs involved. 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.
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 T.It is therefore essential to …
of Overburden Removal Stripping Ratio determines relative amounts of each to be moved. If coal generates a $5/ton earning and. overburden costs 45 cents per cubic yard to move what is the maximum economic stripping ratio $5.00/ 0.45 = just over 11 cubic yards per ton Called a Break Even Stripping Ratio Complexities Warning Units of Stripping ...
For the mining and processing of mineral commodities, the quantity of rock required to be mined varies significantly by commodity and deposit, and depends on factors including ore grades, deposit type, mining method (e.g., open pit or underground), ore body depth, and stripping ratios even for a single mineral commodity.
The stripping ratio presented a slight increase, but remained close to the pit levels, which is 0.21. Therefore, the long-term mining planning must evaluate according to its premises of ore and waste movement whether the proposed grade alteration implementation of especially in routes A and B, is viable.
April 10, 2018. A strip ratio, or stripping ratio, is an important measurement related to the open-pit mining process. It represents the amount of waste material, also known as overburden, that must be moved in order to extract a given amount of ore. That said, stripping ratios are not only about the volume of unwanted material present at a ...
Stripping ratio is the ratio of the volume of waste rock stripped off to the volume of ore exploited during the process of surface mining. It indicates the volume of waste rock required to be stripped for mining per cubic ore. Stripping ratio (see Fig. 1) is an important technical-economic indicator in open-pit mining, which reflects the ...
3.Stripping Ratios and Pit Limits The technical and economic decisions in open pit operations is determined primarily by the ratio of the volumes of stripping to the tonnage of ore mined as a whole and in various periods of the open pit activity. The quantitative estimation of these relationships is done by using the stripping ratio. The following …
company generally is mining a ratio of waste material to mineral deposits that is different from the stripping ratio. Refer to Exhibit 04-6A 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 life-of-mine stripping ratio.
Li et al.4 derived a formula to calculate the eect of mining area width on the stripping ratio and constructed an optimisation model of mining area width and end gang coal compression height ...
The quantity of ore mined and waste rock (i.e., overburden or barren rock) removed to produce a refined unit of a mineral commodity, its rock-to-metal ratio (RMR), is an important metric for understanding mine wastes and environmental burdens. In this analysis, we provide a comprehensive examination of RMRs for 25 commodities for 2018. …
for mining per cubic ore. Stripping ratio (see Fig.1)isanimportanttechnical-economicindica-tor in open-pit mining, which reflects the eco-nomic benefits of open-pit mining. According to differentspace,time,andeconomicconnotationit reflects, it can be divided into average stripping ratio (n p), production stripping ratio (n s), bench ...
IFRIC 20 considers when and how to account separately for these two benefits arising from the stripping activity, as well as how to measure these benefits both initially and subsequently. IFRIC 20 only deals with waste removal costs that are incurred in surface mining activity during the production phase of the mine ('production ...
The profit can be generated if mining project has the lower stripping ratio (R) compared to the maximum allowable stripping ratio (R. max) and the higher average grade of ... After determining the optimal cut-off grade, we can calculate the total profit using Equation (7). Y ' = (a. 0 + a. 1. T. c)( c. 1. UV −c. 1.
