## 3.2.8: The Concept of a Cutoff Grade | ABC 123: Testing ...

Mar 02, 2014· The cutoff grade is influenced by a few external factors that you can control to a certain extent, and these will be considered in the prefeasibility analysis when the cutoff grade is determined. Let's imagine that we have a deposit of copper that we are evaluating. It is a large resource with a grade …

## 100 Years of Resource Growth for Copper - Impact of Costs ...

Nov 28, 2010· MinEx Consulting Strategic advice on mineral economics & exploration There is a trade-off between tonnes and grade Rio Blanco copper deposit 0% 2% 4% 6% 8% 10% 1 10 100 1000 10000 16 Grade (%Cu-equiv) Resource (million tonnes) Source: MinEx Consulting March 2010 1100 mt @ 0.58% Cu = 6.38 mt Cu 65 mt @ 1.26% Cu = 0.82 mt Cu Lowering the cut-off ...

## Cutoff grade optimization based on maximizing net present ...

Jan 01, 2018· In single-product and single-process mode, the optimum cut-off grade and the net present value of production are calculated for each year of the mine's life. After validating the outputs of the model, the implementation of the computer model based on the data of Gol Gohar iron mine in a five-year plan was carried out.

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

Dec 04, 2011· 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 under \$96 (\$1000/31 X 3 or \$1000 per ounce/ 31 grams (troy ounce) X 3 grams of gold) Simply put, if it were to cost more than \$96 to mine, treat, and ...

## Mineral Deposit Value - How to Calculate the Potential ...

As you can see in the example above, the deposit does not have to be enormous in size (only 500 meters long by 100 meters wide) to contain a valuable deposit (approximately \$6 billion worth of minerals). However, in order to be as realistic as possible about this valuation, you can not assume that the complete ore body contains the same grade (i.e. 2% copper and 1.5 gram per tonne gold).

## (PDF) Stripping Ratios, Pit Limits & Cutoff Grade ...

Optimum cut-off grade policy for open pit mining operations through net present value algorithm considering metal price and cost escalation. By Raul Cezar. Maximizing the net present value by applying an optimal cut-off grade for long-term planning of the copper open pits. By Daniel Krzanovic.

## District Intersects 8.65 m at 2.9% Copper, 0.4 g/t Gold ...

2 · Cut-off grade of 0.50% CuEq utilized, which may include up to 2.0 m of internal dilution. Underground mining cut-off at the nearby Garpenberg Mine was US\$32/tonne in 2020.

## How to Calculate the Cut-Off Grade - GuruFocus.com

Feb 03, 2014· This article about how to calculate the cut off grade is a great resource for investors in individual mining stocks. However, when you are investing in mining stocks through a Stock Based mineral ETFÂ I recommend you to read this article too.. For conducting a mining project's break-even analysis you first need to know about the operational expenses (OPEX).

## Cutoff Wheels | McMaster-Carr

Extra-Long-Life StraightGrinder Cutoff Wheels for Metal. These high-density ceramic oxide wheels have two layers of fiberglass mesh reinforcement and last up to twice as long as long-life cutoff wheels when cutting aluminum, iron, stainless steel, and steel.

The cut-off grade of an ore is essentially the lowest grade of an ore that is worth mining. If the ore grade is less than the cut-off grade, then a mining company will not make money mining that ore. According to Fellows (2010), the cut-off grade of an ore is one of the main …

## Overview | Copper Mountain Mining Corporation

Mineral Reserves are reported at an NSR cut-off value of \$8.95/t for Little Eva and Turkey Creek, \$9.35/t for Bedford and Blackard, \$10.32/t for Lady Clayre and Scanlan, and \$11.44/t for Ivy Ann. Mineral Reserves are reported using copper and gold prices of \$2.75/lb and \$1,250/oz, respectively.

## Resources and Reserves - Aeris Resources

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.

## Copper Lead Concentrate Separation - 911 Metallurgist

Oct 01, 2015· The copper sulphides can then be floated off, the galena passing out in the tailing which thus comprises the lead concentrate. The copper and lead concentrates obtained by dichromate treatment are generally of rather better grade than those made by the cyanide method. Flotation Copper …

## Some observations on copper yields and ore grades ...

Mar 01, 2012· It plots the ratio between head and reserve grades against LME copper prices in real terms between 1998 and 2009. Changes in the ratio would reflect changes in cut-off grades within existing mines. Download : Download full-size image; Fig. 13. LME copper prices and the ratio between head and reserve grades 1998–2009.

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

Feb 20, 2017· Antas is a high-grade, low-cost copper mine with gold byproduct credits and significant exploration potential. 2.5% copper grade in reserves puts this mine fifth on the list. 1. Sudbury. Morrison ...

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

Jul 13, 2016· 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.

## Multi-mineral cut-off grade optimization by grid search

optimum cut-off grades for the equivalent variable can be found by using any of the established methods of single mineral cut-off grade optimization, e.g., Lane (1964, 1988), Dowd (1976). Operating cut-off grades for the equivalent grades do not necessarily correspond to achievable, or even meaningful, cut-off grades for the grade-tonnage distrib-

## Making the grade: understanding exploration results ...

The Ivanhoe Mines Kakula deposit in the DRC has returned very high copper grades, including 11.91 metres (true width) of 6.23% copper at a 3.0% copper cut-off. GOLD: One ounce, or roughly 30 grams/tonne is high-grade and can be expected to move markets in most cases.

The cut-off grade is around 0.2g/t gold. For the 2011 year Boliden's Aitik mine (within the Arctic Circle in Sweden) milled 31.5 million tonnes at a head grade of 0.24% copper, 0.16g/t gold and 2.0g/t silver. At the end of 2011 it had reserves of 710 million tonnes at a grade of 0.25% copper…

## What is cut-off grade? An introduction to overlooked yet ...

May 16, 2018· Likewise, 0.5% copper would be an extremely high cut-off for a porphyry copper deposit (outside of Escondida) . Finally does it look like they have done their homework? Establishing cut-off grade is a process not single event. A cut-off grade is proposed, and then the parameters of the deposit are calculated, and tested against economic scenarios.

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 • 190 Likes • 21 Comments

## ISCAR Grade Chart - Metal Cutting Applications

austenitic stainless steel and hard steel at low to medium cutting speeds. S.T. IC808 IC908 P15-P30 M20-M30 K20-K40 S05-S20 H05-H15 TIAIN TiN A tough submicron substrate, TiAlN PVD coated grade. Designed for machining heat resistant alloys, austenitic stainless steel, hard alloys and carbon steel at medium to high cutting speeds, interrupted cut

## Cut-off grade determination for the maximum value of a ...

Cut-off grade determination for the maximum value of a small Wits-type gold mining operation by R.C.A. Minnitt* Synopsis Work undertaken in the field of cut-off grade optimization has not advanced much beyond the work undertaken by Lane in 1988. His definitive work …

## Capstone Mining - Capstone Presents a Robust Cobalt ...

Feb 19, 2020· Mineral Resources for the Santo Domingo Sur, Iris, Iris Norte, and Estrellita deposits are reported using a cut-off grade of 0.125% CuEq. CuEq grades are calculated using average long-term prices of US\$3.50/lb Cu, US\$1,300/oz Au, and US\$99/dmt Fe conc.

## BeMetals Files Technical Report Supporting Increased ...

1 · For SM20-028/43 a nominal 0.5% copper cut off has been applied. Figure 1: ... BeMetals is also progressing both its advanced high-grade, zinc-silver-gold-copper polymetallic underground exploration at the South Mountain Project in Idaho through a preliminary economic assessment, and its tier-one targeted, Pangeni Copper Exploration Project in ...

## OPTIMIZING THE CUT OFF GRADE IN SARCHESHMEH …

grade of (0.1408%), which brings about an increase of 848051645 US dollars as profit, in comparison to the cut off grade (0.1617%) that was obtained by the Lane tripartite model. Key words: production management; cut off grade; Lane quartet mode; Sarcheshmeh Copper Mine.

## [PDF] Cut-off grade optimisation for a bimetallic deposit ...

Corpus ID: 139195674. Cut-off grade optimisation for a bimetallic deposit: case study of the Ruashi Mine Copper-Cobalt deposit @inproceedings{Mugwagwa2017CutoffGO, title={Cut-off grade optimisation for a bimetallic deposit: case study of the Ruashi Mine Copper-Cobalt …

## Understanding Grades of Copper Scrap | ASM Metal Recycling

Cut-Off Grade (percentage per tonne) \$ 33. \$ 3. (\$ 33 / \$ 3 =) 11 pounds / tonne. ( (11 / 22) x 1% =) 0.50 percentage /tonne. Note: When the cost price per tonne can not be found in the mining company's feasibility study, I kindly ask the mining company's management to give me their best estimate. In order to be extra conservative in my ...