The inter-ministerial group on coal blocks on Friday reviewed progress made in 10 mines by companies such as Navbharat Power, Abhijeet Group's JAS Infrastructure and JLD Yavatmal, which are under the CBI scanner in the coal allocation scam.
"The IMG today (Friday) reviewed around 10 coal blocks which are under the CBI scanner. However, the meeting remained inconclusive," said a source close to the development.
The IMG is likely to meet again to take a call on the mines, the source added.
"Some of the coal blocks which were reviewed today (Friday) are Rampia and Dip of Rampia," the source added.
The Rampia and Dip of Rampia coal blocks were jointly allocated to Navbharat Power, Sterlite Energy, ArcelorMittal, GMR Energy, Reliance Energy and Lanco Group in 2008.
The panel also reviewed coal blocks allotted to other companies, including JLD Yavatmal, AMR Iron and Steel Pvt Ltd and JAS Infrastructure, he said.
The Central Bureau of Investigation is probing alleged irregularities in the allocation of 192 coal blocks between 1993 and 2011.
The agency has registered three preliminary enquiries, which are related to allocations between 2006 and 2009, blocks awarded between 1993 and 2004, and allotments to joint ventures.
The government had formed the IMG last year to review the progress of coal blocks allocated to firms for captive use and recommend action, including deallocation.
Intensifying the drive against firms sitting idle on allotted coal blocks, the IMG had last month recommended issuing show-cause notices to companies including Jindal Steel and Power, Hindustan Zinc and Ultratech for delaying production from captive mines.
The coal ministry had earlier issued notices to allottees of 30 captive coal blocks for failing to develop the blocks on time.