Which mineral is known as `Black Gold` ?

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Q: 24 (MPPSC/2011)
Which mineral is known as 'Black Gold' ?

question_subject: 

Geography

question_exam: 

MPPSC

stats: 

0,70,17,8,6,70,3

keywords: 

{'iron ore': [4, 0, 2, 5], 'mineral': [1, 0, 3, 10], 'bauxite': [1, 1, 3, 2], 'black gold': [0, 0, 0, 1], 'manganese': [2, 0, 0, 1], 'coal': [0, 1, 2, 0]}