What is a cut off grade in mining?
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What is a cut off grade in mining?
mineral processing And, if the material has already been mined, there is a certain grade below which it is not profitable to process it; this is the mill cutoff grade.
How is cut off grade calculated?
The cutoff grade is the grade at which the cost of mining and processing the ore is equal to the desired selling price of the commodity extracted from the ore. The block below represents 1 ton (T) of in-place ore. We know that the grade is 1\%, so we have 20 lb. of copper distributed in that ton of ore.
What is mill cut off grade?
Cut-off grade is defined as the grade that is used to distinguish between ore and waste within a given ore body. It also differentiates between various types of ore for different metallurgical processing options.
How do you calculate the grade of an ore?
The average grade of each hole is the sum of the products of each sample length by its assay value divided by the sum of the lengths. This grade, multiplied by the volume of the prism and divided by the volume-per-ton factor, gives the tons- percent or ton-dollars in the prism, as the case may be.
What is a high grade ore?
Mining. In mining, high grading refers to mining out the portions of the orebody that has the highest grade of material to be mined. However, it may also refer to the concealment and theft of valuable gold or silver ore by miners for personal profit.
How do you know what grade your ore is?
What affects cutoff grade?
The cutoff grade can be determined through a variety of methods, each of varying complexity. The cutoff grade is adapted as the economic environment changes with regard to metal prices and mining costs, and is therefore constantly changing. Metal value is not the only factor affecting the profitability of an ore block.
What does grade mean in mining?
Key Takeaways. All precious metals are graded by the amount of metal within the ore. A higher grade means that it takes less effort to remove the metal from the ground. 2 The World Gold Council rates gold based on ore density measured by grams per tonne, or g/t.
What is high grade and low grade ore?
What is the difference between a high grade and a low grade ore? High-grade ore contains a large concentration of the desired mineral. Low-grade ore has a smaller concentration.
How do I know what grade my gold is?
Understanding Gold Grading
- All precious metals are graded by the amount of metal within the ore.
- A higher grade means that it takes less effort to remove the metal from the ground.
- The World Gold Council rates gold based on ore density measured by grams per tonne, or g/t.
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