HONG KONG--India's western state of Goa, the country's largest exporter of iron ore, is unlikely to resume production of the steelmaking ingredient any time soon, despite a court order partially lifting a mining ban there.

Under a Supreme Court ruling issued Monday, mining companies need to apply for a renewal of their mining leases, but that is not the only hurdle, as output initially will be restricted to 20 million metric tons a year and as other governmental approvals will be needed before production can restart.

A renewed flow of Indian supplies to the world market could have major implications for mining companies like BHP Billiton Ltd., Rio Tinto and Fortescue Metals Group Ltd, all of whom are ramping up output in Australia just as demand growth from the world's main importer, China, has been slowing. The result has been weaker prices--benchmark Asia iron-ore prices have fallen around 15% so far this year, although they are up on lows seen in early March.

India was the world's third-largest iron-ore exporter after Australia and Brazil until two years ago, but domestic output and exports slumped after environmental concerns and illegal production prompted legal restrictions on mining in several states, including Goa. The state used to account for about half of India's iron-ore exports, and China was its biggest buyer.

India exported 118 million metric tons of the ore in 2009-2010, but in the financial year ended March 31 this had plummeted to around 15 million metric tons.

"It will take some time. The Supreme Court has lifted the ban, but the state government of Goa and the (federal) ministry of environment and forests have to review their suspension orders," said Basant Poddar, vice chairman of the Federation of Indian Mineral Industries, the largest miners' representative body in India.

"There are lots of procedural issues," Mr. Poddar told The Wall Street Journal, predicting that it would take until October for these to be resolved if the various government approvals came through speedily.

Output restrictions still apply elsewhere in India. Although the Supreme Court lifted a production ban for a majority of the mines in the state of Karnataka, the second-largest producer of the raw material in India, its ruling also imposed conditions on the resumption of operations that still haven't been met.

Should all the Goa approvals come through quickly, India's iron ore exports might double to around 30-35 million metric tons in the current financial year and then increase to around 50 million metric tons by 2015-16, said Mr. Poddar.

Write to Biman Mukherji at biman.mukherji@wsj.com

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