minimum cut off grade of underground copper mine

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. Although in a variety of units can be used, the cut-off grade is usually expressed as: g/t (grams per tonne)

Generally speaking, one gram per tonne works for open-pit mines, but underground gold mines require at least 2.5 g/t to be economic. Open-pit mining is either done with a fleet of haul trucks (some...

Which of the following refers to the minimum grade cut off by which a material from ENGINEERIN 123 at University of Mindanao - Main Campus (Matina, Davao City)

The underground cut-off grade has been approximated at 0.75% Cu prior to completion of cost optimization and has been applied for purposes of the mineral resource statement only.

1. Introduction. In recent years, the mining industry has faced considerable challenges by the depletion of ore grades (Topp, 2008, Prior et al., 2012).Various studies worldwide show that the head grade for copper, gold, platinum and other metals will decrease further by the end of 2030 (Batterham and Elvish, 2009, Walters, 2016, Rule et al., 2015).As an example, the copper grade has been ...

Underground constrained resources with RPEEE are stated as contained within estimation domains above 0.31% CuEq cut-off grade. Underground bulk mining footprints are based on an assumed copper price of $3.80/lb, assumed molybdenum price of $13.00/lb, assumed silver price of $20.00/oz, underground mining cost of $9.25/t, processing cost of $7.00 ...

The after-tax NPV for the Copper Mountain Mine assuming an 8% discount rate is estimated to be $1.01 billion . The economics are calculated assuming a Canadian Dollar to U.S. Dollar exchange rate of 1.30 to 1 and metal pricing of $3.15 per pound copper, $1,700 per ounce of gold and $22 per ounce of silver.

Goldcorp Corporate Cut-Off Grade Policy for all Open Pit, Underground Mines, Projects and Studies in 2019. Following up on the completion of a major gold mining company's operations cut-off grade strategic optimization study earlier in 2018, SRK Sudbury has been commissioned by the same company to generate a corporate cut-off grade policy ...

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.

Perfect application of an optimum cut-off grade should ensure that only ore generating more than a minimum net return is mined, and that as much as possible of the ore capable of generating that return is mined._x000D_ Therefore differing mining costs in different parts of some underground mines necessitate local modifications to cut-off grade.

That is, cutoff grade selection must be dynamic with respect to both time and space. A newly developed method that fulfills these requirements is presented. In this method, the deposit or a portion of it under study is divided into "decision units" based on the mining method and sample data. The statistical grade distribution and the grade ...

Resource Geologists are geologists who can value the basic underlying economic attractiveness of a mineral deposit. This means knowing the costs and practicalities of mining and processing for a particular product.. 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).

COPPER: Anything over 100 metres and 1% copper equivalent or better is considered to be high-grade. For example, Serengeti Resources announced 119.6 metres of 0.9% copper equivalent (copper plus...

A Mining Valuation Lesson on Cut-Off Grade Theory and Practice. Equedia Newsletter December 4, 2011. The world's central banks have come together to help with the severity of Europe's problems. Unemployment in the US fell to 8.6% - the lowest level in more than two and a half years. Markets soared with the biggest 3-day gain since 2009.

This thesis is entitled 'Cut-Off Grade Optimisation at Xstrata, Mt Isa'. It involved conducting a cut-off grade optimisation study on Orebody 3000 of Xstrata's Enterprise Mine, which is a large-scale open stoping underground copper mine. The objective of this thesis was to develop an integrated methodology for a detailed cut-off grade optimisation study on Orebody 3000, as a function of ...

Cut-off grade is an indicator used in mining to separate waste material and ore. Cut-off grade optimization is very com... Comparative study of cut-off grade optimization methods in underground gold mining: AIP Conference Proceedings: Vol 2363, No 1

With 7.9% copper grade in reserves, Sudbury leads the pack of richest underground copper mines. Although having very limited copper reserves, this copper operation is benefitting from the recent...

As you can see, the difference between a ton and a tonne is approximately 10%. Then, you need to be aware of the following conversions: 1 ton = 2,000 pounds, 1 tonne = 2,204.62262 pounds = 1,000 kilograms, 1 kilogram = 2.20462262 pounds, 1% of a tonne = 22.0462262 pounds = 22 pounds (rounded)