Multiple choice question:

Which of the following is incorrect ?

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Minerals are usually formed in “ores”.

The term ‘ore’ is used to describe an accumulation of any mineral mixed with other elements.

The mineral content of the ore must be in sufficient concentration to make its extraction non commercially viable.

The type of formation or structure in which they are found determines the relative ease with which mineral ores may be mined.

answer is C.

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Detailed Solution

It is false to say that the mineral content of the ore must be concentrated enough to make economic extraction impossible. The correct answer is that the mineral content of the ore must be concentrated enough to make commercial extraction feasible.
Typically, minerals are found in "ores." An accumulation of any mineral combined with other elements is called ore. The concentration of minerals must be high enough for the ore extraction to be economically feasible. The relative ease of mining mineral ores depends on the type of formation or structure in which they are found. This also determines the cost of extraction. Therefore, we must understand the primary categories of mineral formations.

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