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cut off grade iin mining

cut off grade iin mining

mining, concentrating, and processing. He related these steps to the concept of Net Present Value to create a method of cut off grade determination that maximizes present value. Lanes Method offers a more accurate and complex way to calculate cut off grade. This method also requires more information, so it may not be the first choice for a preliminary calculation. Although t...

Polymetallic Deposits

Polymetallic cut off grade estimation is explained here

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Cut off grades are used to determine the point at which material becomes economically valuable. Therefore, they are necessary to define the amount of ore in a deposit. The classification of ore depends entirely on cut off grade. Increasing the cut off grade places a stricter requirement on what can be considered ore. This decreases the amount of material that can be considered ore, and with it the reserves and life of mine.

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The cut off grade determined in the design phase of a project may become outdated as production continues. It is therefore important to reevaluate the cut off grade over time. However, the mine plan should not be completely altered for short term gain. Tactical short term objectives must not supersede strategic long term objectives for operations to be successful in the long term.If the metal price increases, it may seem intuitive to lower the cut off grade since the low grade material can be mined at a profit. However, the better decision is often to increase the cut off grade instead. Processing the higher grade material will yield an increase in the amount of valuable mineral produced. This is assuming that the processing capacity does not change; only the ore being processed does. The extra product can then be sold at this increased price. There may also be several objectives involved the selection of cut off grade. A Hill of Values can be used to find the optimal grade in this...

See full list on minewiki.engineering.queensu.ca

See full list on minewiki.engineering.queensu.ca

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