By David Russell, reporter at OptionMonsterNEW YORK -- Canadian gold miner Iamgold ( IAG) has been rocking higher, and bullish traders piled into the stock on Friday. OptionMonster's real-time tracking systems detected the purchase of almost 9,000 March 18 calls, most of which priced for 90 cents against open interest of just 15 contracts. There was also heavy volume in the January 12.50 and March 19 calls. Calls lock in the purchase price of a stock, so they can generate some nice leverage in the event of a rally. But they will expire worthless if the shares don't move. Iamgold rose 7.49% to $15.79 and is up about 50% since early August. The entire precious-metals space has been strong recently as the euro has climbed and as investors have correctly anticipated more money-easing policies by the Federal Reserve. Other commodities, including petroleum, have also benefited. Overall option volume in the name was 12 times greater than average on Friday, with calls outnumbering puts by 7 to 1. Russell has no positions in IAG.