in coal mining what is a good strip ratio

Can Indonesia 39 s coal mines maximise strip ratios and boost reserves

16 Dec 2016 The declining trend in strip ratios for Indonesia 39 s coal mines have allowed producers to survive in periods of lower coal prices through reduction in Indonesia yearly LoM Weighted average strip ratio amp change in reserves 2013 2016 Indonesia yearly weighted average and percentage change in strip nbsp

Coal Mining Terms Cline Mining Corporation

Panel dimensions vary over time and with mining conditions but currently average about 900 feet wide coal face width and more than 8 000 feet long the minable extent of the panel measured Current Western Canadian open pit coking coal mines typically operate with clean coal stripping ratios of between 7 and 8 to 1

Surface Mining Techniques used in the Oil Sands Oil Sands

1 May 2016 Strip mining is the mining of a relatively flat deposit very close to the surface commonly used in coal or phosphate industries That means the average mine life in the oil sands typically ranges from 20 to 40 years A strip ratio of 2 is considered high but feasible if the ore grade is high enough A better nbsp

Economic Surface Mining of Multiple Seams SAIMM

The d cision making problem involves l study of economics cut off grades and ratios equipment capabilities l gt Iucncing and selective milling mUltiple sewn strip mining industry seems as favorable as Iltat predicted for the entire industry A TYPICAL MULTIPLE SEAM SURFACE COAL MINE Using a walking dragline nbsp

Mine Plan Justification Whitehaven Coal

Average stripping ratio of 6 4 bcm t insitu ROM coal This JORC Reserves estimate uses similar modifying factors as the XPAC database but extends beyond the 30 year period and embraces the total lease and exploration area Hence the mine plan is a subset of the pit shell used for the overall JORC Reserves estimate

1 4 Stripping Ratio Ratio Surface Mining Scribd

OSR will provide information regarding overall economic viability of the mine e Overall stripping ratio OSR In case of coal deposits Incremental stripping ratio InSR InSR is the change in the stripping ratio from year to year Average stripping ratio will indicate the economic viability up to the given instant additionally it nbsp

Cost Models of Theoretical Mining Operations CostMine

Mine Type Surface Mine Stripping Ratio 1 1 Ore Production 5 000 tonnes per day Waste Production 5 000 tonnes per day Haul Distance Ore meters 1 532 Haul Distance Waste meters 1 310 Total Resource tonnes 18 720 000 Hours per shift 10 Shifts per day 2 Days per year 312 Bench height Ore meters nbsp

Presentation Title Arial bold size 36 University of Saskatchewan

7 Oct 2010 Stripping Ratio Cut Off Grade and Impact on Production – Optimum Globally about 40 of coal production involves surface mining Coal Mining ○ Sensitivity to price ○ Concept of Stripping Ratio ○ Large deposits The first project off the mark was the Great Canadian Oil Sands GCOS Project

Surface Coal Mining Methods in Australia InTechOpen

9 Mar 2012 Large scale open cut coal mining operations commenced in Australia in mid 1960s and since then there has been significant developments in this method of mining The mines are now operating at significantly higher annual tonnages growing deeper more complex and operating at higher stripping ratios nbsp

Estimating Average Total Cost of Open Pit Coal Mines in InfoMine

such as coal quality stripping ratio as well as other possible explanatory variables is less important Estimation of the daily run of mine is based on operating time periods of the process plants mining operations crushing plants and maintenance services There is a general agreement that the size of the deposit has a nbsp

First Impressions Production stripping costs KPMG

19 Oct 2011 In IFRIC 20 Stripping Costs in the Production Phase of a Surface Mine the IFRS Interpretations average life of mine stripping ratio approach while others expense such costs as incurred or follow the activities used to extract resources that may not be embedded in an ore deposit for example coal

Stripping ratio and pit limit Basic Mining Techniques

26 Jul 2017 Stripping ratio is expressed broadly as the ratio of waste to ore It 39 s simply calculating how much waste has to be removed to expose how much of ore to be mined Stripping ratio determines where the pit limit will be There are basically three 3 forms of stripping ratios The overall stripping ratio average nbsp

Glossary of Mining Terms RocksandMinerals com

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 Stripping ratio The unit amount of overburden that must be removed to gain access to a similar unit amount of coal or mineral material

Stripping ratio Wikipedia

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 will require mining three tonnes of waste rock Stripping ratios are typically reduced to nbsp

Stripping Ratios Pit Limits amp Cutoff Grade Optimization

In strip coal mining operations the following are sometimes seen Overbuden Thickness ft Overburden yd 3 SR SR Coal Thickness ft Coal tons 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

Dragline or Truck Shovel UNSW Engineering

fluctuations over recent years which is the best option to plan for By modelling an Example Mine Large scale open cut strip mining for coal commenced in Australia in the mid 1960s At that time it was a and truck shovel systems in the overall industry and the trends with respect to strip ratio and size of operation

Energy resources Coal 2 5 Surface mining OpenLearn Open

By counting the squares in the overburden and by assuming a maximum stripping ratio of 20 1 determine whether it would be economic to strip mine the coal seam Its great thickness and the fact that it is composed of the remains of woody material suggest that the coal formed in a stagnant tropical mire where the rate of nbsp

Rational economic stripping ratios

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 They each contain a single coal seam of average thickness 5

Determining Stripping Ratio Basic Mining Techniques

4 Apr 2016 Stripping ratio simply refers to the amount of waste handled in order to recover certain amount of ore

stripping ratio mining Britannica com

great depths that it becomes uneconomical to continue with surface mining The point where it becomes economically necessary to switch from one method to the other can be calculated with the aid of stripping ratios which represent the amount of waste material that must be removed to extract a given amount of coal

Surface Strip Coal Mining Handbook sacea

This handbook on surface strip coal mining serves as a general introduction to the subject of mining specifically surface strip experiences in strip coal mining are not reflected to any great degree in this handbook rather the basic generic principles COAL MINING 5 1 3 PRODUCTION COST AND STRIPPING RATIO

chidliak Strip Ratio

Strip itself is easily understood in coal mining where you may have 20 metres of overburden before you expose a 2 metre coal seam In this case it is a simple to just In reality the strip ratio is much smaller then average in the beginning of the mine and much larger at the end of the mine life If you have a pit wall angle of nbsp

Mining PwC

overburden mineral ore extracted to be compared with the expected average over the life of the mine This method relies on good estimates of the average ratio based on the feasibility studies of the project Higher than average stripping costs are deferred when the actual strip ratio exceeds the average expected strip ratio

Stripping Ratios What are They and Why are They Important INN

27 Jun 2017 Ioannou gave some examples of mines with good strip ratios including Lundin Mining 39 s TSX LUN Candelaria copper gold silver mine in Chile at 2 8 1 and Copper Mountain Mining 39 s TSX CMMC copper mine in BC at 2 1 Detour Gold 39 s TSX DGC Detour Lake gold mine in Ontario has a strip ratio of nbsp

Optimal production rates in opencast coal mining University of

15 Nov 2011 Optimal production rates in opencast coal mining A value driven approach Iwan de Jongh The average rate at which mining takes place within a certain time period normally per as coal thicknesses it can be seen how these contribute towards the saleable strip ratio The mining sequence was in all nbsp

Mining Exxaro

This section includes discussion and comment on the mining engineering and related aspects of the LoM Plans associated Leeuwpan Mine a mature open pit coal mine in operation since 1992 employs strip mining methods to The stripping ratio for the next five years or so will remain above the average of the LoM