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The term ‘Rat hole mining’ is used in which mining?

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The term ‘Rat hole mining’ is used in which mining?

(a) Gold

(b) Silver

(c) Coal

(d) Copper

The question was posed to me during an interview for a job.

Asked question is from Mineral Resources of India topic in section Natural Resources of Energy Management

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Right choice is (c) Coal

Explanation: Rat hole mining is used in coal mining because of the sizes of holes. This type of mining is carried out in the state Meghalaya. In this type, mining is done by digging small holes into the ground like holes dug by rats. This type of mining is generally done illegal.

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