"We are not bothered about it (legal challenge). We have already issued notices to all the mine lessees to appear before the commission," Justice Shah told reporters after arriving here.
The commission would proceed with its investigation into alleged illegal mining of iron and manganese ores in the state, he said.
Justice Shah is scheduled to preside over today's hearing where at least 14 major mine companies and the state government would appear.
The commission had been appointed by Ministry of Mines in November 2010 to go into allegations of illegal mining of iron and manganese ores in Odisha and Goa.
Both Odisha government and the mine companies have hired prominent lawyers from Supreme Court to plead on their behalf before the Shah Commission.