In a setback for mining baron Anil Agarwal's group, the government has rejected Vedanta group firm's application for extension of contract for a key Cambay basin oil and gas block. Vedanta Cairn Oil and Gas, a unit of Mumbai-listed Vedanta Ltd, was the operator of the Gujarat offshore block CB-OS/2 with a 40 per cent stake. State-owned Oil and Natural Gas Corporation (ONGC), which holds 50 per cent interest in the block, in a stock exchange filing, said the Ministry of Petroleum and Natural Gas has, in a September 19 letter, told the partners that the application for extension of the production sharing contract (PSC) for CB-OS/2 has not been accepted. ONGC, which has been asked to take over the operations in the interim period, did not state the reason for the move. PSC is an agreement between the government and a resource extraction company. It gives the company time-specified right to explore, develop and produce resources in exchange for a pre-agreed share of the produced output