Mining companies in Odisha are gearing up to challenge a demand notice amounting to Rs 2900 crore clamped by the state government. The notice pertains to realize cost of excess production beyond the limits approved under Mining Plan endorsed by the Indian Bureau of Mines (IBM), consent to operate granted by the State Pollution Control Board (SPCB) and violation of Forest (Conservation) Act, 1980.The notice, the second in a row by the state government since the Supreme Court order in a case of rampant illegal mining in Odisha filed by the NGO Common Cause, has the miners livid. The miners argue the apex court order did not point to recovering penalties for other violations save the environment clearance (EC). For iron and manganese ore production limits exceeding the EC limits, the state government had sent a demand notice, seeking Rs 17576.17 crore- a figure worked out by the court appointed central empowered committee (CEC)."The second demand notice raised by the state government is .