NEW YORK ( TheStreet) -- Mines Management ( MGN), Great Northern Iron Ore Properties ( GNI) and New Gold ( NGD) headed the gainers' list last week, while Alpha Natural Resources ( ANR), International Coal ( ICO), and Walter Energy ( WLT) were the top losers last week.Mines Management was the top advancer last week, gaining around 20.2% after filing a technical report in support of the Preliminary Economic Assessment for its Montanore Silver-Copper project in Montana. New Gold posted an 11.6% increase, after reporting highest gold production and lowest cash cost in its history during 2010. For the full-year, gold production stood at 381,911 ounces, beating the company's guidance of 330,000-360,000 ounces. Meanwhile, annual cash cost per ounce, net of by-product sales, came in at $428 per ounce, lower than its 2010 guidance of $430 to $450 per ounce. BMO raised its rating on New Gold to outperform from market perform and Cormark securities upgraded the stock to buy from market perform last week. Stillwater Mining ( SWC), North American Palladium ( PAL), and Platinum Group Metals ( PLG) were up 11.5%, 9.8% and 6.7%, respectively, as platinum and palladium for COMEX spot delivery gained nearly 3.0% and 0.4%, respectively,. Mechel ( MTL) piled 10.2% after Troika upgraded the stock to buy from hold on higher coal prices. In the penultimate week, Goldman Sachs raised its price target on Mechel to $40 from $34.7. Silver stocks dominated the advancers' list as the white metal COMEX spot delivery rose 4.3% last week. Other movers Mag Silver ( MVG), Endeavour Silver ( EXK), Silver Wheaton ( SLW), Hecla Mining ( HL) and Compania de Minas Buenaventura ( BVN) posted 9.5%, 8.0%, 7.5%, 6.4% and 5.7% gains, respectively. Massey Energy ( MEE) advanced 9.0% during the week after announcement of its acquisition by Alpha Natural Resources. Massey reported fourth quarter revenue of $730 million during the week vs. consensus $723.7 million, while earnings per share plunged 69 cents vs. consensus 31 cents on margin declines. BHP Billiton ( BHP) rose 8.1%. During the week, the company announced that its Jansen, Saskatchewan greenfield project progressed to the feasibility stage. In a separate news, the company announced plans to invest $200 million to expand Spence Copper mine in Northern Chile. Teck Resources ( TCK) and Freeport-McMoRan Copper & Gold ( FCX) were up 8.0% and 6.9%, respectively, backed by a 5.4% increase in LME copper prices for spot delivery. In addition, UBS has upgraded Teck Resources to buy from neutral.
Similarly, Alcoa ( AA), Alumina ( AWC), Kaiser Aluminum ( KALU) and Aluminum Corporation of China ( ACH) added 6.3%, 7.8%, 4.6%, 4.2%, respectively, as LME aluminum for spot delivery gained 2.5%. Alpha Natural Resources headed the losers' list last week, plunging 8.3%, on a possible downgrade from Moody's. International Coal Group declined 5.4% after the company reported weaker-than-expected fourth quarter results. Earnings per share came in at 5 cents vs. consensus 7 cents on lower production. Patriot Coal ( PCX) dipped 1.4% after revenue of $528.2 million came below analysts' estimates of $542.3 million. Harmony Gold Mining ( HMY) dropped 0.1% despite a surging gold prices after a fatal accident at Tshepond mine in which a worker was killed. Walter Energy, James River Coal ( JRCC) and Schnitzer Steel Industries ( SCHN) were the only decliners among other metal & mining stocks, shedding 2.5%, 2.1%, and 0.1%, respectively.