Placer deposit are natural concentration of heavy minerals caused by the effect of gravity on moving particles. When heavy, stable minerals are freed from their matrix by weathering processes, they are slowly washed downslope into streams that quickly winnow the ...
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Optimisation of Cut-Off Grade Considering Dilution and Waste Rehabilitation Costs
A paper written by: Pascal Amedzrovi, George Agyei, University of Mines and Technology, Tarkwa, Ghana. The most important factor in mine production planning is called cut-off grade. Therefore, it’s accuracy is important as it can seriously impact the net present ...
Key informations about Escondida Mine
Location At 170 km southeast of Antofagasta, in the northern Chilean Atacama Desert, sits the copper porphyry deposit known as Escondida. In Spanish, the name Escondida means “hidden.” It comes from the primary orebody, which is concealed by hundreds of ...
General rules for plant design (Part 02)
Yesterday, we present a first rule that guides plant design and surely you noticed that a metallurgist has a huge duty and to reach processing goals, he must work with project geologists. Today, let’s discuss on the second law. What ...
How does the depth of a deposit affect the cut-off grade?
A cut-off grade determines which drilling intercepts may and cannot be used in a JORC resource. It is the grade of mineralisation at which a deposit can be exploited profitably. The price at which a firm can sell the underlying ...