Earlier in this lesson, we looked at the maximum stripping ratio, and we did it for coal seam. You will recall that the maximum allowable stripping ratio, SR max, also called break-even stripping ratio, is the maximum …
BEP's resources are shallow and amenable to surface mining at extremely low stripping ratios. In 2021, BEP continued the evaluation of its development options, environmental impact assessment, social and community programs, engineering and geological studies, and preparation for mine readiness. Kestrel Coal Mine (Kestrel)
Stripping Ratio. Environmental constraints. Strip Mining is normally chosen where the overburden thickness is such that excavation can be carried out by a single stripping machine such as a dragline. 8.6.2 Stripping Ratio. Overburden Ration = d/t. This is a depth ratio often used by geologists. Mining engineers use a volumetric ratio.
1.4.1.1By feeding conditions (slurry vs dry) The water-coal ratiois typically between 40 and 60% by weight. Slurry-fed gasifiers are typically more tolerant of variation of coal quality …
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 …
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.
Mode of excavation. If the mode of excavation is manual the maximum stripping ratio is 1.5 to 2:1 in the case of semi-mechanization methods like shovel-dumper combination the stripping ratio that can be adopted is 4 to 5:1. In the case of dragline or big bucket wheel excavation the stripping ratio up to 10:1 is also visible.
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 …
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 …
In its Q1 2019 report, the company said that, generally speaking, "higher strip ratio" at its mines drove up cost per ton for the period. Western Fuels Association …
Mining then ceases. The ratio of the amount of waste rock stripped to ore removed is called the overall stripping ratio. The break-even stripping ratio is a function of ore value and the costs involved. Ore reserves. The first step in the evaluation and design of an open-pit mine is the determination of reserves.
The average stripping ratio B. Behera Á M. K. Mishra (&) Department of Mining Engineering, National Institute of Technology, Rourkela, India e-mail: [email protected] of Indian coal mines ...
The overall stripping ratio is calculated using the average values for the volume of the overburden and the average value for the weight of the coal (ore). This number is a key indicator for the potential of the project to be …
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 …
The maximum allowable stripping ratio enables us to locate the ultimate pit boundary or limit based on prevailing economic, physical, …
MINE 202 SURFACE MINING CHAPTER 2 UNIT OPERATIONS IN MINING Lecture Objectives At the end of this lecture, you will: 1.Understand the sequence of unit operations. 2.Know the main and auxiliary equipment used for loading and haluage. 3.Know how to calculate stripping ratios. 4.Know the stipping ratio models. 5.Know how to calculate …
It focused on the different stripping techniques used in South African mines and evaluated their efficiencies in terms of capital invested, labour productivity, production outputs, operational expenditures and other productivity measures. These results were used to benchmark each individual South African surface coal mine with
The second metric is applicable to shallower deposits that are being evaluated for surface rather than underground mining, and it is known as the stripping ratio. Let's start with stripping ratios, and let's use a …
Stripping ratio. definition. Stripping ratio or "strip ratio" means the ratio of waste tons to ore tons mined. Stripping ratio means the ratio of waste material to ore that is experienced in mining an ore body. Stripping ratio means the ratio of waste to ore in an open pit mine. "Sulfide" means a compound of sulfur and some other element.
that the coal sediment modelling on seam X has 2.17 meters of thickness and calculation of estimated mined reserve obtained by coal is 335.272,19 MT, overburden 2.026.338,38 BCM so that stripping ratio is 6,04: 1.With a vast amount of pit is 14,29 ha. Keywords: Coal, Block Model, Batter block Solid, Stripping Ratio, Reshgraph. PENDAHULUAN
The average stripping ratio of Yimin opencast coal mine was 2.68 m 3 t −1 (Yang 2002). The production of Yimin opencast coal mine was 21 × 10 6 t a −1, thus stripping volume of soils and rocks was approximately 56.28 × 10 6 m 3 a −1, and when 100 t coal was produced, a total of 268 m 3 volume of soils and rocks was stripped.
3.2.5: Instantaneous Stripping Ratio. The stripping ratio (SR) refers to the amount of waste material that must be removed for a given amount of ore. ... (Figure 3.2.10). Assume that the ore extends down to considerable depth, and that open-pit mining will be used to extract ore. When open-pit mining is no longer economical, an …
Mining will proceed by advancing into the hillside until reaching the break-even stripping ratio. At this point, the highwall will remain. Under certain conditions, we may choose to take advantage of the exposed coal seam, and develop an underground mine or practice highwall mining, which will be discussed later in this lesson.
First Online: 29 July 2022 18 Accesses Downloadreference work entry PDF Stripping ratio is the ratio of the volume of waste rock stripped off to the volume of ore exploited during …
The stripping ratio increases when mine goes deeper while the amount of recovered ore remains constant in inclined deposits. In this instance, the amount of overburden increases as well. Also, as ...
The two basic mining methods are surface (Opencast) and deep underground mining. The choice of mining method depends primarily on depth, density, overburden (OB), and thickness of the coal seam; seams relatively close to the surface, at depths less than approximately 55 m (180 ft), are usually surface mined. Coal seams at depths of 55 to …
Western Fuels Association reported in its annual report that by 2023, the strip ratio at its flagship Dry Fork mine "will have increased by over 40%.". The non-profit reported increasing strip ratio is "a challenge other mines in the PRB have experienced for several years.". That trend shows up as increase in cost per ton, usually from ...
Elements that influence production stripping ratio include natural terrain and topography and geological conditions in the mining area, stripping sequence in the pit limit, mining parameter, market, price, ore supplying and blending requirement, and development transportation. Production stripping ratio varies with the extending of mining projects.
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 ...
For the ecological optimum pit, the unit ecological costs assigned to coal mining and rock stripping are 0.1029 US$/t and 0.3922 US$/m 3, respectively, which represent 5.74% and 16.43% of the original unit costs ... The stripping ratio is reduced by 18.79%. (2) The consideration of ecological cost in the optimization process of the …
1 Introduction to Mining Lecture Unit -Stripping Ratios & Pit Limits Colorado School of Mines Mining Engineering Department Revision: October 22, 2014 Bingham Canyon,Utah, Kennecott Copper 2 Stripping Ratios: Waste units/Ore units Stripping Ratios The stripping ratio (SR) refers to the amount of waste that must be …