Implied volatility in MolyCorp (MCP) is moving higher amid active trading in the options on the stock after China said it was keeping rare earth material export quotas unchanged in 2012. Supply concerns sent MCP down $3.5 to $28.5 per share. Jan 30 calls are the most actives on the stock. 2,675 traded. March 35 calls are the next most actives after 2,584 changed hands. Total volume is about 12,000 puts and 16,000 calls, and implied volatility jumped 19 percent to 70.