Strip Ratio In Coal Mining

STUDY MATERIAL

Strip mining Large land area can be involved especiallyfor coal and Example Alcoa s Sierra de Bahoruco Aluminum mining in Southern Peninsula until 1985 Strip mining Blast scoop off rock overburden and then scoop out ore material Fairly shallow Economics of strip mining depend on stripping ratio bauxite

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Coal Mining How Is Coal Mined Science ABC

Strip Mining In strip mining the first step is to strip off the vegetation and soil in the vicinity of the surface to be mined for coal The large intermediate layer of sediment and rock the overburden is then blasted and removed using large trucks Once exposed the underlying coal seam is excavated in strips and transported out

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Stripping Ratios What are They and Why are They Important

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

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Steelmaking Coal Operations

Clean Strip Ratio 6 year avg Strip Ratio Supports Future Production 7 • Strip ratio increase planned in 2021 ‒Low strip low cost Coal Mountain closing ‒Development at larger mines to increase capacity and access to higher quality coals • Future strip ratio on par with historical average 0 $50 $60 $70 $80 $90 $100 2021

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The Coal Mine Ncondezi Energy

The Coal Mine The Ncondezi coal mine will be an open pit low strip ratio contractor mining operation producing million tonnes of coal over a 25 year life of mine to supply to the adjacent power plant via a 2km conveyor Following approval of the Mine Definitive Feasibilty Study and the Environmental and Social Impact Assessment Ncondezi

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Determining Stripping Ratio Basic Mining Techniques

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

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PPT Calculating Stripping Ratios for Area Strip Mines

The Coal Area Strip Mine Formula • Strip Ratio = OB Thickness in ft / Coal thickness in inches Assumes coal is 80 lbs/ft^3 good for bituminous Area Strip Mine Geometry Geologic Stripping Ratio no accounting for rehandle or less than 100% coal recovery Your Turn • Use What You Have Learned About Calculating Stripping Ratios for Strip Mines and Break Even Limits to

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Semirara Mining and Power Corporation

Washable Coal is washed in the Coal Washing Plant to get rid of contaminants with a 60% average recovery The combination of Washed Coal and Clean Coal becomes the Total Product Coal or TPC What is meant by strip ratio It indicates the ratio between waste moved in cubic meters for every metric ton of coal produced such that a 10 1 strip

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Blasting Principles Orica

Strip Ratio The ratio of waste material to ore or coal moved in a defined period Stope An underground void formed by the mining of ore as distinct from development Surface Mine Refer to open cut mine T Trim Blast A blast designed to reduce damage and backbreak to the rock left behind

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Glossary of Mining Terms Coal Education

Glossary of Mining Terms Abutment In coal mining 1 the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides which act as abutments of the arch of strata spanning the roadway; and 2 the weight of the rocks over a longwall face is transferred to the front abutment that is the solid coal ahead of

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Giant Shovel on I 70 Ohio Strip Mine Fight 1973 The

For an excellent retrospective on the 1970s 1990s history of the strip mining fight citizen activists involved in that fight and history on the strip mine law The Surface Mining Control & Reclamation Act of 1977 see Special Issue on the 20th Anniversary of the Federal Coal Law Citizens Coal Council Reporter August 3 1997

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Glossary of Mining Terms Coal Education

A Abutment In coal mining 1 the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides which act as abutments of the arch of strata spanning the roadway; and 2 the weight of the rocks over a longwall face is transferred to the front abutment that is the solid coal ahead of the face and the back abutment that is the settled packs behind the face

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Strip Mining of Coal A Federal Response to State Legislation

inherent in the strip mining of coal 1 Strip mining is a method of mining by which large power shovels strip off the soil and rock overlying coal beds dump it to one side and then load the underlying coal onto trucks Brooks Strip Mine Reclamation and Economic Analysis 6 NATURAL RESOURCES

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Surface Coal Mining Methods in Australia

Surface Coal Mining Methods in Australia 5 2 Open cut mining methods strip mining Large scale open cut coal mining operations commenced in Australia in mid 1960s and since then there has been significan t developments in this method of mining The mines are now operating at significantly higher annual tonnages growing deeper more complex and

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Jellinbah Mine

Selective mining at Jellinbah Mine produces PCI coal products The mine is open cut with the Jellinbah Central and Mackenzie North pits being owner operator operations and Thiess Mining operating the mine s Plains pit A favourable strip ratio and generous seam thickness means that Jellinbah mine is a highly productive mine

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Basic Information about Surface Coal Mining in Appalachia

Surface coal mining involves removing parts or all of mountaintops to expose buried seams of coal and interburden rock between coal seams Overburden and interburden are disposed of in adjacent valleys because the broken rock will not all fit back into the mining pit and disposal alternatives are limited

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12 Stripping Ratios & Pit Limits Introduction to Mining

In strip coal mining operations the following are sometimes seen ft Thickness Coal ft Thickness Overbuden SR = tons Coal yd Overburden SR 3 = 3 Stripping Ratios Instantaneous stripping ratio The stripping ratio for a given push back Overall stripping ratio The stripping ratio for the total amount of material removed

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Blasting approaches to decrease greenhouse gas emissions

underground coal mines when it is released from coal seams during mining Mining energy and greenhouse gas emissions Mining faces two inherent challenges in reducing energy consumption and GHG emissions perhaps uniquely as an industry The first is that shallower mineral deposits are typically mined first This means that as strip ratios increase

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Occurrence and Remediation of Coal Mine Bumps A

coal mine bumps and on methods to control them This work supports the USBM s mission to improve safety for l upe sory civil engineer 2 ining engineer miners by eliminating their exposure to hazardous underground conditions During the 1930 s USBM research indicated that both geology and mining practice geometry and sequence play

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SURFACE MINING Mining Engineering Site

Auger mining is a mining method that recovers coal or other minerals from under the highwall when the ultimate stripping ratio has been achieved in open cast mining operations or Auger mining refers to a method for recovering coal from thin seams to thick beyond a highwall produced by conventional open cast or strip mining area mining or contour mining or from seams

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Coal Mining Industry financial strength leverage

Quick Ratio Comment On the trailing twelve months basis Despite sequential decrease in Current Liabilities Quick Ratio detoriated to in the 2 Q 2021 below Coal Mining Industry average Within Energy sector 2 other industries have achieved higher Quick Ratio Quick Ratio total ranking has improved so far to 78 from total ranking in previous quarter at 79

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Wilpinjong Coal Mine Industry Presentation

History Mining commenced 2021 Produces thermal coal for export and domestic markets Truck and shovel operation Average strip ratio for the life of mine approximately 2 1 One of the lowest cost coal mining operations in Australia Approved for ROM 16Mtpa Railings 24 hour a day operation Employs approximately 530

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What Is a Stripping Ratio with picture

Esther Ejim The stripping ratio is commonly used in the ore and coal mining processes Stripping ratio is a term that is derived from the mining industry and is used in reference to the open pit mining process The stripping ratio method of calculating the profitability of the mining procedure is commonly used in the ore or coal mining process

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What is Strip Mining with pictures Info Bloom

Strip mining is often done to mine coal Area strip mining is designed for relatively flat areas of ground which can be worked quickly and easily The main concern in flat areas tends to be containment and proper disposal of overburden to keep the site under control

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Coal Ratio an overview ScienceDirect Topics

Contour surface mining takes advantage of the low strip ratio coal reserves adjacent to the outcrop Contour mining equipment includes a drill loader bulldozers and trucks The steps in contour mining begin with drilling and blasting a triangle shaped portion of overburden in cross section above the coal to be mined

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Strip Mining CITIZENS COAL COUNCIL

Strip mining is a type of surface mining where the overlying vegetation rock and soil overburden is removed in order to reach the underlying coal seam which usually lies a few feet beneath the surface Explosives are used to fracture any overlying rock and

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Coal Controversy In Appalachia NASA

Surface mining at these scales is more economical for coal companies safer for miners and coal operators say essential for mining the thin seams of lower sulfur coal more valuable in today s market With dynamite and immense machines surface mines can produce more than two to three times as much coal per miner as underground mines can

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LEEUWPAN COAL MINE Exxaro Mining Sustainable Mining

Mining recovery efficiency 5% CS ; 5% DMS bypass Planned average slope angles 45 degrees For highwall stability soft material is mined at least one strip ahead of hard material and coal mining activities Practical plant yield 90% DMS; 90% FA DMS slimes loss on DMS of 9% and on FA DMS of 15% Strip ratio cut off N/A

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Company Profile Jellinbah

A favourable strip ratio and generous seam thickness means that Jellinbah East mine is a highly productive mine Jellinbah Coal is a low volatile bituminous coal with high specific energy low ash and sulphur With these properties it is ideally suited to pulverised coal injection blending for coke making and special coal boilers At Jellinbah

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Appendix G Glossary of Mining Terms The Strip Mining

Longwall mining A system of mining on straight faces up to 400 yards in length A power machine shaves the coal along the face over the entire length of a panel designated for mining Self advancing hydraulic lifts are used to hold the ceiling in place until mining is completed on a given panel

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Coal Mining The 2 Most Basic Techniques Of Extraction

Surface mining is more economical than underground mining It is most commonly used in the US Because most of the coal is found just under the surface reclaiming the land after the closure of mine is far simpler The different types of surface mining that can be used are 1 Strip mining 2 Auger Mining 3 Open pit mining 4 Mountain removal

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What is stripping ratio in mining Quora

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 some tonnage of ore For example a 3 1 stripping ratio means that mining one tonne of ore wil

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PDF Stripping Ratios Pit Limits & Cutoff Grade

Stripping Ratios Pit Limits & Cutoff Grade Optimization Download Related Papers Optimum cut off grade policy for open pit mining operations through net present value algorithm considering metal price and cost escalation By Raul Cezar

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