Rational economic stripping ratios: International Journal ...

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 …

Surface mining methods

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 ...

Energy Efficiency Ratios of Surface Mining Systems for a ...

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 …

2012 Americas School of Mines

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

Determining Stripping Ratio

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.

Productivity in the Mining Industry: Measurement and ...

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 ...

(PDF) Mining Methods-Part II: Surface Mining-Planning and ...

Mining Methods, Surface mining The line for the pit limit was f ound using the required pit slope and located at the po int that ga ve a waste: or e ratio of 1.3:1.

Mining Terms

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.

Surface Mining

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

Influence of depth-thickness ratio of mining on the ...

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 ...

Acme of surface mining ratios

2015-4-3 · Acme of surface mining ratios Published on April 3, 2015 April 3, 2015 • 6 Likes • 0 Comments. Report this post; Richard Allen Cox Follow Executive Vice President SA Gold Operations at Sibanye ...

Analysis of Highwall Mining Stability

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

How to Calculate Mining Profitability: Top 7 Mining ...

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 …

(PDF) Surface Mine Design

SURFACE MINE DESIGN 1. Izhar Mithal Jiskani. BACKG ROUND. The method of mining is unique for each different size and each shape of the ore body. Mineral deposits differ in the …

Haul Road Design Guidelines

2021-8-19 · Superelevation is a technique employed at Mine XYZ to assist vehicles in manoeuvring safely around corners. Superelevation is the banking of the road surface at curves. It allows the vehicle taking the corner to counteract centrifugal forces towards the …

Energy Efficiency Ratios of Surface Mining Systems for a ...

Related papers. Page number / 5 5

Guidelines for use of the Scaled Span Method for Surface ...

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

Underground Mining Methods and Equipment

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

surface mining ratio

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 .

Stripping Costs in the Production Phase of a Surface Mine

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

CALCULATING SURFACE AREA TO VOLUME RATIOS

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

Influence of depth-thickness ratio of mining on the ...

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 ...

(PDF) Stripping Ratios, Pit Limits & Cutoff Grade ...

(PDF) Surface Mine Design

Stripping Ratios: What are They and Why are They Important ...

2018-10-30 · 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...

(PDF) Stripping Ratios, Pit Limits & Cutoff Grade ...

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.

Pillar design

2019-6-28 · Surface elements include bodies of water and soil.. Barrier Pillars ... used in cut-and-fill mining and they provide immediate support to the roof while enabling reasonably high extraction ratio. As the mining progresses, the pillars become more slender. This causes …

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