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Q.

More than 2,800 types of minerals have been identified, but only about 100 are considered as?


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a

Mining

b

Quarrying

c

Ore minerals

d

Metallic  

answer is C.

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Detailed Solution

More than 2,800 minerals have been identified, but only 100 are considered ore minerals. An ore is a rock with qualities that allow it to be mined economically. The cost of mining, grinding, and separating the element you want is less than the price you'll get for it when you sell it. This usually entails having a higher concentration of the component than ordinary rock. Traditional iron ore, for example, contains iron values of 40 per cent or more. However, having a large amount of iron isn't the only requirement to be mineable.
 
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