what is stripping ratio coal mining

PDF CHAPTER 11 Mining Technology Princeton University

Area Strip Area strip is the principal surface mining technique used in the United States. The tech nique was perfected in the coalfields of Illinois, Indiana, Kentucky, and Ohio. The capacity of a dragline, the machine used to remove the overburden in strip mining, varies in size from 10 to over 200 cubic yards.

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What is the maximum stripping ratio of open pit diamond mines ... Quora

Answer: I am busy with a design project and I need to benchmark average stripping ratios of different Diamond mines to justify going underground. Openpit mines are typically enlarged until either the mineral resource is exhausted, or an increasing ratio of overburden to ore makes further mining...

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PDF Availability of Coal Resources for Mining in Illinois

12 Stripping ratio of the Herrin Coal, Shawneetown Quadrangle 18 13 Availability of the Herrin Coal for surface mining, Shawneetown Quadrangle 20 ... The technological restrictions on surface mining are stripping ratio (30% of original surfaceminable resources), small block size (14%) and thick unconsolidated overburden (2%). Stripping ratios ...

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Coal and Coal Mining National Academies of Sciences, Engineering, and ...

Surface mining involves stripping off overburden to access coal resources. Overburden is the layers of soil and rock that overlie a coal bed. Surface mining is limited by stripping ratios: ratio of the volume of overburden (in cubic yards) to the quantity of coal (in short tons). the limit of surface mining (maximum economic stripping ratio) is

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Earth Science: Surface Mining. Blogger

Surface Mining. 1. Strip Mining. Strip Mining is used when coal is near the surface of when the overburden is unstable. As mining progresses, the overburden is placed in the previous mine cavity. The mining is done in long, narrow strips. The waste, dirt, and rock that they take off of the top of the next strip is to put on top of the last one.

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North Antelope Rochelle Mine Global Energy Monitor

The average quality of the coal shipped from the mine is 8,800 BTU/lb, % sulfur, % ash, and % sodium (of the ash), making North Antelope Rochelle coal the cleanest in the United States. In 2012 the mine won an award from the Department of the Interior for its reclamation efforts over the life of the mine.

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Is the strip ratio still an important factor in open pit mines? LinkedIn

So, in simple terms, the strip ratio represents the amount of waste material that must be removed in order to extract a given amount of ore. The most basic calculation of the strip ratio involves...

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PDF Stripping Costs in the Production Phase of a Surface Mine

4 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 profitable high grade. Removal of material with a low ratio of ore to waste may produce some usable material, which can be used to

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PDF Schissler AP (2004) 485494 Coal Mining, Design and Methods of

strip mining. Contour Stripping Coal seams and associated overburden can outcrop on the edges of hills and mountains. Figure 3 shows a crosssection of a typical contour mine plan. Contour surface mining takes advantage of the low strip ratio coal reserves adjacent to the outcrop. Contour mining equipment includes a drill, loader ...

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Thoughts Of a Coal Miner Blogger

In mining, stripping ratio or strip ratio refers to the ratio of the volume of overburden (or waste material) required to be handled in order to extract 1 ton volume of coal. ... But in case of the allocated coal mines the stripping ratio can go upto 3 to 4. Thus the production cost will be higher. Thus the Cost of extraction taken by CAG doesn ...

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TUTORIAL EXAMPLES stripping ratios and cutoff ..

srm costs per tonne metal = recovery = 88% breakeven cutoff grade = + ( ) x = % marginal cutoff grade = concentrating cost per tonne ore (metal price per tonne srm costs per tonne metal) x recovery = = % ( 1137) x solution to overall stripping ratio = tonnes material .

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(PDF) Surface Mine Design ResearchGate

Auger mining is a surface mining techniq ue used to recover additional coal from a seam located behind a highwall produced either by stripping or openpit mining.

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Rational economic stripping ratios Taylor Francis

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.

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Understanding When Costs Associated with ... Micon International

In this instance, the mining company should consider on a casebycase basis whether the subsequent stripping cost is to be expensed as OPEX or should be capitalised. Micon''s mining engineers are skilled at scheduling open pit stripping to optimize NPV while meeting the constraints of fleet and process plant capacity.

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DEVELOPMENT Underground mining and mining machinery Google

Stripping of the overburden will then proceed if the minerals are to be mined at the surface. Economic considerations determine the stripping ratio, the ratio of waste removed to ore recovered; it may range from as high as 45 yd./ton (38 m./tonne) for coal mines to as low as yd./ton ( m./tonne) in metal mines. Some nonmetallic mines have ...

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Mine Mining Basics Open Cut Coal

Open cut or surface mining in coal is a suitable choice when coal seams are closer to the natural surface. It is an effective method of retrieving a higher proportion of coal when compared to underground mining. The basic process involves: 1) Exploration 2) Geological Modelling 3) Mine Design 4) Top Soil Stripping 5) Drilling Blasting

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stripping ratio Definition | Law Insider

stripping ratio means the ratio between waste and ore in an open pit mine. Sample 1 Based on 1 documents stripping ratio or " Strip Ratio" means the estimated ratio of bank overburden (measured in cubic meters) to coal (measured in tonnes) excavated from the site by the mining operator. Sample 1 Based on 1 documents

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stripping ratio Definition | Law Insider

stripping ratio or " Strip Ratio" means the estimated ratio of bank overburden (measured in cubic meters) to coal (measured in tonnes) excavated from the site by the mining operator. stripping ratio means the tonnage or volume of waste material which must be removed to allow the mining of one tonne of ore in an open pit.

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Coal mining Wikipedia

Globally, about 40 percent of coal production involves surface mining. [9] Strip mining [ edit] Strip mining exposes coal by removing earth above each coal seam. This earth to be removed is referred to as ''overburden'' and is removed in long strips. [10]

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