NEW YORK ( TheStreet) -- International Coal Group ( ICO), Haynes International ( HAYN) and Alcoa ( AA) were top gainers last week; Endeavour Silver ( EXK), US Gold ( UXG) and Mines Management ( MGN ) headed the losers' list.International Coal Group gained 31% last week. Recently, Arch Coal group and ICO unveiled an acquisition agreement under which Arch would acquire ICO's outstanding shares for $14.60 per share, with completion expected by the end of the second quarter. Heading into 2011, ICO expects to produce and sell 16.5 million to 17.5 million tons of coal, including 3.3 million to 3.7 million tons of metallurgical coal. Haynes International, a leading manufacturer of technologically advanced high-performance alloys used in the aerospace and chemical-based industries, rose 5.2% after reporting improved first-quarter results on May 6, 2011. Revenues increased 47% to $139 million, while net income was $6.2 million with earnings per share of 51 cents, compared to net revenue of $94.6 million, net income of $1 million and earnings per share of 8 cents in the year ago quarter. The company expects similar performance in the third and fourth quarters of 2011. Alcoa ( AA) gained 1% last week. With increase in aluminum demand, Alcoa expects 6.5% annual growth rate. Alcoa forecasts bauxite demand to grow from 214 million to 400 million metric tons per year and pegs alumina demand to surge from 82 million to 156 million metric tons per year. Alcoa foresees aluminum demand to grow from 39 million to 73 million metric tons per year. Mines Management ( MGN) was the top loser last week, declining 24.4%. Silver tumbled 18.7% last week to settle at $35.6 per ounce, following widespread selloffs. The company plans to focus on the exploration and delineation of Montanere Project. The losers were Endeavour Silver ( EXK), Silver Standard Resources ( SSRI), Silver Wheaton ( SLW) and Pan American Silver ( PAAS), erasing 19.1%, 13.2%, 11.8% and 8.1%, respectively. Additionally, gold prices dipped 3.2% last week to $1495.6 per ounce. As a result, US Gold declined 20.1%. Other companies like Golden Star Resources ( GSS), Eldorado Gold ( EGO), Goldcorp ( GG), Gold Fields ( GFI) and Yamana Gold ( AUY) shed 15.1%, 14.3%, 12.4%, 10.8% and 7.2%, respectively. Goldman Sachs believes that the pullback in major commodities prices last week may create an opportunity for commodities to stage a comeback by the second half of 2011.