London-listed Vedanta Resources hopes to restart its Sterlite Copper smelter in southern Indian city Tuticorin and still wants to double its capacity despite protests demanding its closure that killed 13 people this week, a company executive told Reuters on Friday.

The company's position comes a day after the state of Tamil Nadu, where the smelter is located, said it was seeking a permanent closure of the plant due to allegations that it pollutes the air and water of the locality.

"We're not in that stage to look at setting up a plant elsewhere," P Ramnath, chief executive of Sterlite Copper, said in an interview.

"We're confident that we will be able to overcome these issues. It will certainly require a huge effort but I am sure we can hope to restart as quickly as possible."

The plant, in the coastal city of Thoothukudi, has been shut since late March for maintenance and pending a renewal of its license, even as locals continued largely peaceful protests demanding its permanent shutdown.

The opposition escalated on Tuesday when thousands of people marched towards a local government office on the 100th day of the protest. Ten people died in police firing that day; three more died in subsequent days.

Ramnath said the smelter suffered from a "perception" that it was the most polluting industry in Thoothukudi because of its size, and that support of the local community would be important to restart the plant and double its capacity as suggested by Vedanta's billionaire chairman Anil Agarwal.

"Our chairman has said that we need the license to operate, but also we need to build bridges with the local community so that we get their license to operate as well," he said. "But at this point of time the atmosphere is very tense, temperatures are high."