"We have asked for global expression of interest. It has evoked a lot of response from the world over. Fifty-two companies have expressed interest," CIL chairman Partha S Bhattacharyya told reporters on the sidelines of the second coal summit.
To meet the growing demand of coal in the country, CIL is considering acquisition of coal properties overseas, specially in Australia, Mozambique and Indonesia.
It expects to buy at least one mine overseas in the current financial year.
CIL has appointed Royal Bank of Canada to conduct due diligence for exploring Australian coal properties.