The passage of the Mines and Minerals Development and Regulation bill by the Rajya Sabha was crucial for Modi because the BJP lacks a majority in the second chamber.
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India was once the world's third-largest exporter of iron ore but is importing heavily now due to court action on illegal mining. India's top court has eased some of the curbs, but state bureaucrats have dithered over renewing mining licenses, fearing charges of corruption.
The government hopes auctions will reduce the risk of wrongdoing, helping to put the mining industry back on track. But it is unlikely to lead to a sudden surge in iron ore output at a time when there is a global glut and prices have crashed.