Stripping Ratios: What are They and Why are They Important

Oct 31, 2018· 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

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 show the volume of waste removal required to extract one unit ton of ore, for example, 1.5:1 as opposed to 3:2.

Stripping ratio and pit limit Basic Mining Techniques

The units for stripping ratios can vary and usually depends on the geological properties of the deposit and the commodity mined. It can be expressed in tonnes (t), or cubic meters (m 3).Usually for coal, cubic meters (m 3) or tonnes (t) are used.However, for hard rock mines where the geology is usually complex with the presence of various rock types, tonnage (t) is usually preferred.

What Is a Stripping Ratio? (with picture)

May 09, 2020· The stripping ratio method of calculating the profitability of the mining procedure is commonly used in the ore or coal mining process. In relation to its application in the mining of ore, the utility of the stripping ratio is the determination of the approximate ratio of waste material that must be moved in order to reach a certain ratio of ore.

What is stripping ratio in mining? Quora

Jul 25, 2018· 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...

Stripping ratio mining Britannica

Other articles where Stripping ratio is discussed: coal mining: Choosing a mining method: 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. Stripping ratios can also consider the selling price of coal, and a certain minimum profit can be added to the total cost of producing and

What Is a Stripping Ratio? (with picture)

Aug 08, 2020· The stripping ratio method of calculating the profitability of the mining procedure is commonly used in the ore or coal mining process. In relation to its application in the mining of ore, the utility of the stripping ratio is the determination of the approximate ratio of waste material that must be moved in order to reach a certain ratio of ore.

Stripping ratio mining Britannica

Other articles where Stripping ratio is discussed: coal mining: Choosing a mining method: 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. Stripping ratios can also consider the selling price of coal, and a certain minimum profit can be added to the total cost of producing and

What is stripping ratio in mining? Quora

Jul 25, 2018· 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...

Stripping Ratio Calculation In Mining

what is stripping ratio coal mining Mine Equipments. Stripping ratio Wikipedia, the free encyclopedia 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 volume of

Mining Surface mining Britannica

Mining then ceases. The ratio of the amount of waste rock stripped to ore removed is called the overall stripping ratio. The break-even stripping ratio is a function of ore value and the costs involved. Ore reserves. The first step in the evaluation and design of an open-pit mine is the determination of reserves.

What is STRIPPING RATIO? What does STRIPPING RATIO mean

Aug 24, 2017· theaudiopedia What is STRIPPING RATIO? What does STRIPPING RATIO mean? STRIPPING RATIO meaning- STRIPPING RATIO definition STRIP...

Stripping Ratio Mineral Production Activities

6. Stripping ratio . The main factor in designing a n open pit mine, which largely determines the cost of mining, is the stripping ratio.. Stripping is the removal of waste rock from above and around the orebody. Stripping ratio is defined as the tonnage of waste rock to be mined, divided by the tonnage of ore to be mined from the pit.

(PPT) Calculating Stripping Ratios for Area Strip Mines

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IFRIC 20 — Stripping Costs in the Production Phase of a

Aug 26, 2010· IFRIC 20 considers when and how to account separately for the benefits arising from the removal of mine waste materials ('overburden') to gain access to mineral ore deposits, as well as how to measure these benefits both initially and subsequently. IFRIC 20 was issued on 19 October 2011 and applies to annual periods beginning on or after 1 January 2013.

Surface mining planning and design of open pit mining

Jan 09, 2016· vii) Stripping Ratio The ratio is most commonly expressed as: Strip Ratio (SR) is the mass of waste to be mined to obtain one unit mass of ore. Waste (tons) SR = ----- Ore (tons) For example, a 3:1 stripping ratio means that mining one cubic meter of ore will require mining three cubic meters of waste rock.

24th clip Surface Mining (Stripping Ratio) YouTube

Nov 22, 2016· Open Cut Coal Mine Planning & Scheduling Software Duration: 4:38. Surpac 6.5.1 Tutorial # 6 Topographic map creation, ore, waste and stripping ratio calculation Duration: 1:08:40.

Lecture 4 Calculating Stripping Ratios for Area Strip

The Coal Area Strip Mine Formula Strip Ratio = OB Thickness (in ft) * 11.11/ 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

Easy profit maximization method for open-pit mining

Oct 01, 2013· Typical variations of exploitable reserves (Q + W) and stripping ratio (R) as a function of the cut-off grade (T CM). Another relevant concept is the allowable stripping ratio R ad,which is defined upon the consideration of a minimum profit ( L min ) that must always exist, and it is given by (5) R ad = T U V − M − B − F / P − L min E

IFRIC 20, policy for deferred stripping costs, mining

(v) Deferral of stripping costs (note 14) Stripping of waste materials takes place throughout the production phase of a surface mine or pit. The identification of components within a mine and of the life of component strip ratios requires judgment and is dependent on an individual mine’s design and the estimates inherent within that.

What is STRIPPING RATIO? What does STRIPPING RATIO mean

Aug 24, 2017· theaudiopedia What is STRIPPING RATIO? What does STRIPPING RATIO mean? STRIPPING RATIO meaning- STRIPPING RATIO definition STRIP...

Stripping Ratio Mineral Production Activities

6. Stripping ratio . The main factor in designing a n open pit mine, which largely determines the cost of mining, is the stripping ratio.. Stripping is the removal of waste rock from above and around the orebody. Stripping ratio is defined as the tonnage of waste rock to be mined, divided by the tonnage of ore to be mined from the pit.

Easy profit maximization method for open-pit mining

Oct 01, 2013· Typical variations of exploitable reserves (Q + W) and stripping ratio (R) as a function of the cut-off grade (T CM). Another relevant concept is the allowable stripping ratio R ad,which is defined upon the consideration of a minimum profit ( L min ) that must always exist, and it is given by (5) R ad = T U V − M − B − F / P − L min E

Lecture 4 Calculating Stripping Ratios for Area Strip

The Coal Area Strip Mine Formula Strip Ratio = OB Thickness (in ft) * 11.11/ 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

Stripping costs — AccountingTools

Oct 22, 2018· Stripping costs are those costs incurred when removing overburden or waste materials in order to obtain access to a commercially-producible ore body. If so, and the activity provides better access to the deposit, then under GAAP the cost should be

ECONOMIC ASSESSMENT AND MINE PRODUCTION

In the economic evaluation, variables as the breakeven cutoff grade (BCOG), stripping ratio and optimal cutoff grade (OCOG) will be considered in order to determine the Net Present Value (NPV), Internal Rate of Return (IRR) and mine life. The BCOG is the minimum grade

IFRS First Impressions KPMG

stripping costs. A recent KPMG survey revealed that many companies capitalise costs, often using an average life-of-mine stripping ratio approach, while others expense such costs as incurred, or follow the US GAAP approach of allocating all production stripping costs to inventory produced in the period.

IFRIC 20, policy for deferred stripping costs, mining

(v) Deferral of stripping costs (note 14) Stripping of waste materials takes place throughout the production phase of a surface mine or pit. The identification of components within a mine and of the life of component strip ratios requires judgment and is dependent on an individual mine’s design and the estimates inherent within that.

Surface mining Wikipedia

Surface mining, including strip mining, open-pit mining and mountaintop removal mining, is a broad category of mining in which soil and rock overlying the mineral deposit (the overburden) are removed, in contrast to underground mining, in which the overlying rock is left in place, and the mineral is removed through shafts or tunnels.. Surface mining began in the mid-16th century [dubious

DETERMINATION OF ULTIMATE PIT LIMITS IN OPEN MINES

Open pit mine planning is a procedure that can be started just after ultimate pit determination and cut-off grade calculation which both of them directly depend on final product price of the mine. Ultimate pit determination in each period of time is a function of financial affairs. This function is well defined by Break-Even Stripping Ratio (BESR).

How to profit from low-grade gold mines MINING.COM

Dec 23, 2018· The mine plan entails a very low strip ratio (0.76:1), which means every there is very little waste ore to help keep costs low and gold production high. At

Mining Terms

Stripping: is the removal of overburden. 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.

Major Mines & Projects Porgera Mine

Porgera Mine is an epithermal vein-type gold-silver deposit but it shares many characteristics with porphyry copper deposits. Remnant heat from the intrusive rocks drove the boiling and upward migration of hydrothermal fluids and resulted in the emplacement of mineralization.

Lecture 4: Mining waste SGU

The ratio between waste rock and ore production is called the stripping ratio. For example, a stripping ratio of 2:1 means that 2 tonnes of waste rock needs to be mined to mine 1 tonne of ore. Generally, an open pit mine has a higher stripping ratio than an underground mine. Waste rock is often stored close to the mine to minimize transports.

Easy profit maximization method for open-pit mining

Oct 01, 2013· Typical variations of exploitable reserves (Q + W) and stripping ratio (R) as a function of the cut-off grade (T CM). Another relevant concept is the allowable stripping ratio R ad,which is defined upon the consideration of a minimum profit ( L min ) that must always exist, and it is given by (5) R ad = T U V − M − B − F / P − L min E

Finding pushbacks in mine sections according to minimum

The determination of overall, incremental, periodical, and break-even stripping ratios in mine sections are commonly the important variables considered in open pit mining design. Several methods are used to determine the stripping ratios in sections. This paper introduces a 'mathematical path' and uses 0–1 matrices in order to calculate

The boundary stripping ratio in ore mining SpringerLink

9. Ch'ang Man-suan, “Investigation and Development of engineering methods of determination of the boundaries of open-cut mining with allowance for ore quality and the time factor,” Author's Abstract of Candidate's Dissertation [in Russian], MGI, Moscow (1970).

Study on the Economic Stripping Ratio in Oil Shale Open

The number of oil shale mines which adopted open pit mining increased with the increasing of oil price, in recent years. The economic stripping ratio is an important basis to determine open pit limit. Since there is no national or occupational standard about economic stripping ratio in open-pit oil shale mine, the economic stripping ratio has calculated by adopting refined oil price.

Major Mines & Projects Porgera Mine

Porgera Mine is an epithermal vein-type gold-silver deposit but it shares many characteristics with porphyry copper deposits. Remnant heat from the intrusive rocks drove the boiling and upward migration of hydrothermal fluids and resulted in the emplacement of mineralization.

ECONOMIC ASSESSMENT AND MINE PRODUCTION

In the economic evaluation, variables as the breakeven cutoff grade (BCOG), stripping ratio and optimal cutoff grade (OCOG) will be considered in order to determine the Net Present Value (NPV), Internal Rate of Return (IRR) and mine life. The BCOG is the minimum grade

IFRIC 20, policy for deferred stripping costs, mining

(v) Deferral of stripping costs (note 14) Stripping of waste materials takes place throughout the production phase of a surface mine or pit. The identification of components within a mine and of the life of component strip ratios requires judgment and is dependent on an individual mine’s design and the estimates inherent within that.

Understanding Iron Ores and Mining of Iron Ore IspatGuru

Apr 03, 2015· The economic stripping ratio varies widely from mine to mine, depending upon a number of factors. In the case of direct shipping ores, it may be as high as 6:1 or 7:1. In the case of low grade ore,a stripping ratio of less than 1.5:1 is often considered as an economic limit. For mining of the iron ore, it is essential to uncover the mine area

IAS 16 — Stripping costs in the production phase of a mine

Accounting for stripping costs in the production phase of a mine; 20 Sep 2011. The IASB tentatively decided that IFRIC 20 did not need to be re-exposed and approved the Interpretation, subject to its final review of drafting changes.

DETERMINATION OF ULTIMATE PIT LIMITS IN OPEN MINES

Open pit mine planning is a procedure that can be started just after ultimate pit determination and cut-off grade calculation which both of them directly depend on final product price of the mine. Ultimate pit determination in each period of time is a function of financial affairs. This function is well defined by Break-Even Stripping Ratio (BESR).

Open Pit (Open Cast) Mining Gold Companies Explained

The main issue for an open pit mine design is the strip ratio. This ratio indicates the amount of waste (rock without gold) that must be extracted to access ore rock. For example, ore rock that is mined directly from the surface will have no strip ratio, because no waste

Key Financial Ratios to Analyze the Mining Industry

May 08, 2020· The mining industry is one of the oldest established industrial operations. Mining has been critical to the development of major countries, such as the U.S., Canada, and Australia. The entire

NPV risk simulation of an open pit gold mine project under

May 01, 2017· Technical information like ore grade, overburden, inter-burden, stripping ratio, recovery rate; and financial and mineral market information like ore concentrate prices, free risk rate, debt costs, etc., has to be gathered to measure how risky a gold mining project is .

Mining Terms

Stripping: is the removal of overburden. 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.