Which one of the the following is largest lignite coal field in India?

Which among the following is the largest mechanized mine in India?

In which of the following districts in India the largest 'Mica Belt' is found?

Out of the following types of iron ore, a reserve of which type is largest in India?

Which one of the following coalfields is not located in Jharkhand?

Which of the following river valleys is rich in coal reserves in India?