cut off grade for feldspar deposit

Mineral Deposits – AMIRHAMZAH.COM

Oct 01, 2010· Tonnage-cutoff model and average grade-cutoff model for a single ore deposit. ... veinlets or disseminations. The main minerals within the ores include pyrite, pyrrhotite, sericite and K-feldspar, with lesser magnetite, chlorite siderite, ankerite, epidote, chalcopyrite, galena, sphalerite and, locally, minor arsenopyrite and marcasite ...

Understanding Cut-Off Grade 3 (Poly-Metallic Deposits) or ...

Dec 04, 2011· In other words, the grade that provides the US$46 is the cut-off grade. Let's once again assume that the gold price is $1000 per ounce, which is equal to $32 per gram (US$1000/31.1 grams) The formula is simple: total cost/recovery/price per unit of metal = Cut-off grade. Therefore, in our example: 46/0.95/32 = 1.5 grams per tonne

Tonnage-cutoff model and average grade-cutoff model for a ...

The capping is from several meters up to 100 m thick. The copper ore body with average ore grade 0.46% (cut-off grade 0.4%) contains about 50,000,000 tons of ore. The ore body contour encloses an area of 0.3 km 2. PETROGRAPHY. Darrehzar stock: The Darrehzar stock is a complex intrusive body, which crop out over an area of about 1 by 2.2 km ...

Break Even Analysis - How to Calculate the Cut Off Grade ...

on cut-off grade s of 4% TREO for the dominant supergene monazite-rich and the basal apatite material (Lynas, 2017). "Ready for sale" total tonnage of REO for the 2017 Financial Year is 16,000t.

Cut-off Grades for Mineral Resource Reporting - Micon ...

Also note that these recovery rates only apply to mining facilities, not in-situ which have much lower recovery rates. Mine operators are only required to process deposits containing more than 7% bitumen, defined as the "cut-off grade". Anything below 7% can still be put through the process plant at the operator's discretion.

Learning Goals: -What is an ore deposit?

Table of ContentsTraditional Cutoff Grades in Open Pit MiningHeuristic Cutoff Grade Optimization TechniquesOptimizing The Cutoff Grades By Lane's ApproachAlgorithm for Determining Optimum Cutoff Grades Cutoff grade is defined as the grade that is normally used to discriminate between ore and waste within a given orebody. Although the definition of cutoff grade is very precise, the choice of ...

Cut-Off Grades For Mineral Resource Reporting: Going The ...

cut-off grade optimization; they describe a software implementation of the method that can accommodate cut-off grade optimization for mineral deposits that contain up to three economic minerals. Keywords cut-off grade, optimization, grid search, multi-mineral deposits. * Mining Engineering Department, Dicle University, Turkey.

Cut Off Grade Calculation Optimization

A cut-off grade of 1.2% copper is used to estimate Ore Reserve in the higher-grade lodes 102 and 108. A cutoff grade of 0.9% copper is used for the lower grade 101 and 105 lodes that are to be mined in retreat at end of mine life. The Murrawombie deposit has separate Ore Reserve estimates for underground mining; and open pit mining.

Tonnage-cutoff model and average grade-cutoff model for a ...

Feb 17, 2018· The green lines represent one possible resource tonnage/grade combination for this deposit. Using a 3 g/t cut-off, this resource would be 6 Mt at an average grade of 8 g/t for 1.54 Million...

Optimization of Cut-off Grades for Molybdenum and …

Cut-off grade optimisation has shown that there is an opportunity to improve the net present value of Ruashi Mining. SimSched gives a higher net present value (NPV) compared to the current Ruashi life of mine schedule. This indicates that SimSched can be used to improve the NPV for Ruashi by ... 2.6 Cut-off grades for polymetallic deposits ...

Mineral Resources Flashcards | Quizlet

surrounding a porphyry copper deposit is 4–5 km, while the median size area of alteration is 7–8 km2 (table 2). Vertical Extent The vertical extent of ore is dependent upon the lower copper cutoff grade, which will vary with the price of copper and local mining costs.

Bitumen Extraction Explained | Oil Sands Magazine

A cut-off grade (COG) is an industry-accepted standard expression used to determine what part of a mineral deposit to include in a mineral resource estimate (MRE). For MRE reporting, COGs tend to be rounded down to ensure that material of no economic significance is excluded from the resource.

Multi-mineral cut-off grade optimization by grid search

face of variations of the cut-off grade. The grade tonnage curve is usually calculated with the in-situ resources or reserves and shows always the 'best' or 'optimistic' scenario, i.e., at a given cut-off grade the respective ... variations in the characteristics of a deposit in function of cutoff grades.

Round Mountain Gold Mine (MRDS #10310392) AU, AG

A cut-off grade (COG) is an industry-accepted standard expression used to determine what part of a mineral deposit to include in a mineral resource estimate (MRE). For MRE reporting, COGs tend to be rounded down to ensure that material of no economic significance is excluded from the resource.

Understanding Cut-Off Grade 4 (Tonnage, Grade, and Costs ...

Mining - Mining - Prospecting and exploration: Various techniques are used in the search for a mineral deposit, an activity called prospecting. Once a discovery has been made, the property containing a deposit, called the prospect, is explored to determine some of the more important characteristics of the deposit. Among these are its size, shape, orientation in space, and location with respect ...

Cutoff grade - Wikipedia

Cut-off grade estimation - QueensMineDesignWiki

The world's top 10 highest-grade copper mines - MINING.COM

May 01, 2020· The Middle-Lower Yangtze Metallogenic Belt (MLYB) is an important metallogenic belt in eastern China and is composed of seven major ore districts ().The Luzong Basin is an important part of the metallogenic belt (Chang et al., 1991, Zhai et al., 1992, Zhai et al., 1996, Tang et al., 1998, Zhou et al., 2008, Zhou et al., 2010, Dong et al., 2010), in which the dominant types of deposits are iron ...

Geochemistry, Mineralization and Alteration Zones of ...

Some reasonable cut-off grade needs to be applied to the mineral inventory prior to reporting them as mineral resources. A table or chart of sensitivity to cut-off grade may be supplied but zero or near-zero cut-off grades may not be reported in most cases. The methods of determining cut-off grade can vary, particularly for open pit deposits.

Grade Tonnage Curve: How Far Can It Be Relied Upon?

A high-grade deposit could have gold values ranging from 10 to more than 150 grams per tonne, whereas a low-grade deposit grades in the range of 1 to 5 grams. Low-grade deposits may have up to, and possibly more than, 200 million tonnes of rock, whereas a high-grade deposit is frequently smaller.

Cut-off Grades for Mineral Resource Reporting - Micon ...

"Feldspar" is the name of a large group of rock-forming silicate minerals that make up over 50% of Earth's crust. [1] They are found in igneous, metamorphic, and sedimentary rocks in all parts of the world. Feldspar minerals have very similar structures, chemical compositions, and physical properties.

Making the grade: understanding exploration results ...

Cut-Off grade is the minimum grade required in order for a mineral or metal to be economically mined (or processed). Material found to be above this grade is considered to be ore, while material below this grade is considered to be waste.. The cut-off grade can be determined through a variety of methods, each of varying complexity.

Understanding Cut-Off Grade 4 (Tonnage, Grade, and Costs ...

Before I can calculate the cut off grade, I first need to show a basic equation which converts a troy ounce into grams per ton: 1 troy ounce = 31.1034768 grams per ton = 34.2857143 grams per tonne. As you can see, the difference between a ton and a tonne is approximately 10%.

Mineral Deposits – AMIRHAMZAH.COM

Table of ContentsTraditional Cutoff Grades in Open Pit MiningHeuristic Cutoff Grade Optimization TechniquesOptimizing The Cutoff Grades By Lane's ApproachAlgorithm for Determining Optimum Cutoff Grades Cutoff grade is defined as the grade that is normally used to discriminate between ore and waste within a given orebody. Although the definition of cutoff grade is very precise, the choice of ...

Cut Off Grade Calculation Optimization

Table of ContentsTraditional Cutoff Grades in Open Pit MiningHeuristic Cutoff Grade Optimization TechniquesOptimizing The Cutoff Grades By Lane's ApproachAlgorithm for Determining Optimum Cutoff Grades Cutoff grade is defined as the grade that is normally used to discriminate between ore and waste within a given orebody. Although the definition of cutoff grade is very precise, the choice of ...

Selection of Optimum Cut-Off Grade for Surface Mining of ...

Oct 01, 2010· 1. Introduction. The tonnage, average grade, and cutoff are the basic parameters in mineral resource assessments and mining operations. Research on the inherent relationships between the tonnage, average grade above cutoff and the cutoff has been carried out for decades on the scale of an ore camp, district or ore province.

Mining Valuation Lesson: Cut-Off Grade Theory and Practice ...

Oct 01, 2010· Tonnage-cutoff model and average grade-cutoff model for a single ore deposit. ... veinlets or disseminations. The main minerals within the ores include pyrite, pyrrhotite, sericite and K-feldspar, with lesser magnetite, chlorite siderite, ankerite, epidote, chalcopyrite, galena, sphalerite and, locally, minor arsenopyrite and marcasite ...

VEIN DEPOSITS - Earth Science

Feb 17, 2018· In these deposits, it is important to understand the distribution of grade (or value) throughout the deposit, and how much of it is above the expected cut-off grade (or cost).

Understanding Cut-Off Grade 4 (Tonnage, Grade, and Costs ...

Gold (Au) may be economically mined from different types of deposits at grades ranging from 1g/t to 30g/t and above, whilst the grade of copper mines commonly range from 0.3%Cu to 3%Cu. Platinum group metals or elements (PGMs, PGEs) include platinum, palladium, rhodium, osmium, rhenium, iridium and ruthenium and usually occur together, often ...

Selection of Optimum Cut-Off Grade for Surface Mining of ...

Jan 28, 2018· The cut-off grade is therefore a minimum threshold and all blocks of material in your deposit or mine with a grade (value) above this threshold …

Cut-off Grade and Hauling Cost Varying with Benches in ...

Cut-off Grade Theory and Practice. Consider a block of ore that weighs 1 tonne and contains 3 grams of gold. At a gold price of US$1000 per ounce the value of the gold in the block of ore is just ...

Orebody types | Mineral Exploration, Evaluation & Planning ...

Selection of Optimum Cut-Off Grade for Surface Mining of Metalliferous Deposits: A Review One of the challenging problems for surface mining operation optimization for metalliferous deposits is choosing the optimum cut-off grade while doing mine production planning, which is a very important component of mine design process.

Breccia, hydrothermal alteration and structural geology of ...

Hipotermal / Porphyri deposit, T = 300 – 500 C, P 3 – 10 km. Mesotermal deposit, T = 200 – 300 C, P 1 – 4 km. Epitermal deposit, T = 50 – 200 C, P 0.3 – 1.3 km. Teletermal deposit, T < 50, P rendah (Shallow) Xenotermal deposit, T tinggi sampai rendah, P …

(PDF) Evaluating Rare Earth Element Deposits

A cut-off grade (COG) is an industry-accepted standard expression used to determine what part of a mineral deposit to include in a mineral resource estimate (MRE). For MRE reporting, COGs tend to be rounded down to ensure that material of no economic significance is excluded from the resource.

Cut-Off Grades For Mineral Resource Reporting: Going The ...

•Demand - The higher the demand for the metal, the more valuable and therefore its cut-off grade will be lower. •The abundance of metal - If a metal is useful but scarce it will have a lower cut-off grade. •Size of the deposit - Larger deposits will be economic to mine at lower cut-off grades.

Preliminary Model of Porphyry Copper Deposits

Where : fixed cost including drilling, blasting, mucking cost, G&A and mill cost.. 3. Cutoff Grade and Average Grade Varying with Benches. On each bench the ore tonnage above the break-even cutoff grade are measured and the average grade of the ore is calculated (Bruce A. Kennedy, 1990) [].It is important to note that profit generated in operation such as net smelter return or NSR depends upon ...

Cut-off Grade Optimisation for a Bimetallic Deposit: A ...

Gold (Au) may be economically mined from different types of deposits at grades ranging from 1g/t to 30g/t and above, whilst the grade of copper mines commonly range from 0.3%Cu to 3%Cu. Platinum group metals or elements (PGMs, PGEs) include platinum, palladium, rhodium, osmium, rhenium, iridium and ruthenium and usually occur together, often ...

Orebody types | Mineral Exploration, Evaluation & Planning ...

Feb 17, 2018· Understanding Cut-Off Grade 4 (Tonnage, Grade, and Costs) or "Why is my mine losing money?" Published on February 17, 2018 February 17, 2018 • 183 Likes • 17 Comments

Feldspar minerals make up over 50% of Earth's crust.

CUT OFF GRADE 1.0 G/T AU; 170200 CONTAINED OUNCES: Gold 7.24 Grams per Tonne: Sugar Zone: 1999: probable: 692000: RESIDENT GEOLOGIST FILES: Gold 6.9 Grams per Tonne: Sugar Zone (inferred) 2004: inferred mineral resource: 904400: Technical report, September 19, 2010, p. 8: CUT OFF GRADE 3.00g/t; 283,000 CONTAINED OUNCES: Gold 9.72 Grams per Tonne

Understanding Cut-Off Grade 3 (Poly-Metallic Deposits) or ...

Mar 24, 2017· For high-grade, underground deposits, a grade of 1% would be a significant intercept over thicknesses of 2 metres or more. ... (true width) of 6.23% copper at a 3.0% copper cut-off…

(PDF) Determining the optimum cut-off grades in sulfide ...

10. If the east deposit has an average grade of 2 percent copper and the west deposit has a grade of 0.6 percent copper, how many tons of copper will be produced? (Check back to 2 and 3 if you forget how to calculate grade.) E- x/20,000,000*100=2 x=400,000 tons W- x/80,000,000*100=0.6 x=480,000 tons