In the maiden auction for Coal blocks, the Centre will today invite bids for two mines on the first day. After clearing the technical bidding stage, entities from Reliance, Adani, Essar, GMR, Vedanta and Aditya Birla groups are eligible for the bidding beginning today for these blocks.The Supreme Court had in September last year cancelled the allocation of 204 mines. The two blocks which will be put on offer today are Talabira-I mine in Odisha for power sector and Sial Ghoghri mine in Madhya pradesh for non-power sector.