b. If this is a sulfide ore, what is the mineral of interest? (1) c. What is the

Question

b. If this is a sulfide ore, what is the mineral of interest? (1) c. What is the assay of the ore? (1) d. If a separation were done on the ore only at a specific gravity of 2.80, determine: a. What is HMS? (1) i. The lead assay of the con (1) The lead recovery (1) ii. The concentration ratio (2) iv. The enrichment ratio (2) v. The lead assay of the tail (i.e., floats or rejects) (2) e. What is the Pb accountability? (2) Discuss why this is acceptable or not. (1) f. Construct a plot of grade vs recovery. Include in the plot the pure mineral. (2) i. Show how you would improve metallurgical performance. (1) i. Discuss how you would actually do it (2) B. Construct one graph with two plots of both grade and recovery vs s.g. (2) specified a Pb Con of 30% without penalties having to be paid, determine: If a smelter schedule i. The s.g. of separation (1) i. The lead recovery (1) h. Discus the implications of having Pb in the tails? (2)

Explanation / Answer

ANSWERS

a) HMS- Heavy Medium Separation is the process of preconcentration of minerals mainly the production of high weight, low assay, which can be rejected as waste. It works on the basic principle of gravity separation for separating minerals of different specific gravity.

b) Minerals obtained from sulphide ores are mainly Nickel and Cobalt.Sulphide ores that are mined for nickel and cobalt typically contain 1.5%–3% Ni and 0.05%–0.1% Co.

c) An assay is a French term means a trial. Assay of ore means testing or determination quantitative and qualitative of minerals present in an ore, and also to find out chemicals present.

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