2008-4-2 · ABSTRACT: 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 …
2017-7-19 · 1. Overview. Surface mining involves the extraction of mineral commodity on the earth''s surface and in the open air. Surface mines can be fully mechanized, partly mechanized, or labour intensive. Large scale operations with high production rates are normally fully mechanized while small scale operations as with alluvial and artisanal mining ...
2021-3-22 · the surface mine ICPDM # 1. A major goal at the mine was to restore the surface to a configuration designed to allow post-mining crop production equal to or exceeding that preceding the mining opera tion. Few publications compare surface-mining systems on the basis of …
2015-6-3 · Notes: Strip Ratio Mining Methods 27 Mistakes are often made when computing the strip ratio. It''s all in the words and you have to watch the flow of material and how it is classified. For example, according to Freeport McMoran''s 2007 10K filing, the concentrator is capable of processing 75,000 metric tons per day of primary sulfide ore and
2016-4-4 · The maximum allowable Stripping Ratio (SR max) defines break even stripping ratio (BESR).This represents the highest possible units of waste that can be handled. If the SR exceeds the BESR then the operation will be uneconomical as the income generated by the ore is insufficient to offset the costs incurred in mining.
5.6 Labour inputs and the capital to labour ratio in mining 91 5.7 Robe River iron ore mine: labour productivity and production, 1973-74 to 1990-91 92 5.8 Lost time injury frequency rate 93 5.9 Tropical cyclone activity 2005-06 95 5.10 Rainfall deciles — high rainfall areas, 2006 96 5.11 Impact of yield declines and production lags on mining ...
2008-11-12 · Important Terms of Surface Mining . Mining Terms . Types of Mining . Types of Mining . Surface Mining: Open Pit Mining: Massive stock-work deposits –gold, copper . ... Stripping Ratio: is the ratio of a unit of waste material removed per similar unit of ore material removed. Toe: is the base of a bank bench or a slope.
2019-4-11 · Surface Mining Experience Matters ... as for shaft mining ropes as described in paragraph 11 section "d" in the previous section. Percentage reserve strength This is the ratio of the metallic area of all the inner wires to the total metallic area expressed as a percentage. This ratio is somewhat
2016-11-1 · In order to study the influence of depth-thickness ratio on bedding slope stability, whose sliding surface is flexural concave in shape under mining conditions, this paper aims to study the characteristics of deformation and damage of bedding sliding with depth-thickness ratios of 200:1, 150:1, 120:1, 100:1 and 50:1 by adopting numerical simulation analysis software combined with laboratory ...
2012-8-30 · knowledge and practice in highwall mining (HWM). HWM has become a widely-applied method in surface mining, commonly used alone or in conjunction with contour or slot mining. It provides 800-feet to 1,200-feet of additional recovery when the economic stripping ratio is reached in contour mining or in slot mining when surface
2019-1-22 · Among useful features are mining profit ratio (%) and profit in monetary terms. Below, they display a profit table. What''s interesting is that the values are updated in real time once you enter your hash rate, power consumption, kilowatt-hour cost, and pool …
2018-9-21 · mining, not enough attention was being paid to early microseismic records suggesting disruption up into the crown, way before collapse occurred. Needless to say, any near-surface mining or civil excavation will create stress changes within the crown pillar that will remain above the new opening. Whether the degree of change will be sufficient to
2020-8-25 · surface is termed underground mining. Underground mining methods are usually employed when the depth of the deposit and/or the waste to ore ratio (stripping ratio) are too great to commence a surface operation. Once the economic feasibility has been verified, the most appropriate mining methods must be selected according to the
mining engineering: STRIPPING RATIO (S) Oct 16, 2015· SURFACE MINING • Surface mining is done by removing (stripping) surface vegetation, dirt, and, if necessary, layers of bedrock in order to reach buried ore deposits (or) surface mining is the process of extraction of minerals by removal of overburden .
2015-8-28 · 1 In surface mining operations, entities may find it necessary to remove mine waste materials (''overburden'') to gain access to mineral ore deposits. This waste removal activity is known as ''stripping''. 2 During the development phase of the mine (before production begins), stripping costs are usually
2020-2-2 · The surface area to volume ratio (SA:V) is the proportion of area of material covering an object to amount of material within the object. i.e. it is a measure of how much covers the object for each unit of interior volume. For the above example: SA:V 54:27
In order to study the influence of depth-thickness ratio on bedding slope stability, whose sliding surface is flexural concave in shape under mining conditions, this paper aims to study the characteristics of deformation and damage of bedding sliding with depth-thickness ratios of 200:1, 150:1, 120:1, 100:1 and 50:1 by adopting numerical simulation analysis software combined with laboratory ...
SR = (3.00 –0.40)/0.50 = 5.2 tons of waste/ ton of ore i.e. while the stripping ratio is less than 5.2 it is most economical to mine the deposit by open pit. When the stripping ratio exceeds 5.2 it will be more economical to mine using the underground mining method block caving.
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