Section 5(5)(b) in Coal Blocks Allocation Rules, 2017
(b)Auction process. - (A) The auction process shall be a two stage process comprising of-(i)technical bid; and(B)The technical bid shall be for the purpose of qualification and the financial bid shall be for the purpose of determination of the successful bidder.(C)The financial bid may be divided into such sub-stages or rounds as may be deemed expedient by the Central Government.(ii)financial bid.