Mining contributed $63 billion (3% of GDP) and employed 20.14 million people (5% of the workforce) in 2016. India's mining industry was the fourth-largest producer of minerals in the world by volume, and eighth-largest producer by value in 2009. In 2013, it mined and processed 89 minerals, of which four were fuel, three were atomic energy minerals, and 80 non-fuel. The government-owned public sector accounted for 68% of mineral production by volume in 2011–12.
For a person working for a wage, their source of income is their job, or their labor (aka their time that they sell to someone). But you can own a house, and rent it out, and when your renters pay you renter every month, the source of that income check is your rental property, or your house. It would just be called rental income. If you have money in the bank in an account that pays interest, those interest payments are another source of income. We can say the source is interest payments, or we can identify the asset that is generating rent, and say your money in the bank that is generating “rent” (aka interest) is your source of income.