NEW YORK ( TheStreet) -- New Gold ( NGD), Endeavour Silver ( EXK) and Patriot Coal ( PCX) are among a few mining stocks that outperformed the S&P 500 Metals and Mining Index last week gaining 5% to 10% vs. 3% increase registered by the index.

Most of the these stocks ended the week in green and a few of them are poised for further gains in the upcoming weeks, based on analysts' consensus estimates, company fundamentals and the performance of the underlying metals.

Among the laggards were Gold Reserve ( GRZ), Solitario Exploration & Royalty ( XPL) and Mechel ( MTL) which declined 3.8%, 3.4% and 2.5%, respectively.

Starting on the next page, we look at five metal and mining stocks, which have been ranked in terms of one-week returns, highest to least.

5. Carpenter Technology ( CRS), engages in the manufacture, fabrication and distribution of specialty metals. The company operates in two segments: advanced metals and premium alloys.

The company develops, manufactures and distributes cast/wrought and powder metal stainless steels and special alloys, other specialty metals and cast/wrought titanium alloys. It also provides material solutions to a few industries. The stock gained 10.4% in the past week.

Last week, the company closed a $350 million syndicated credit facility, which is a five-year revolving line of credit that will replace the three-year $200 million revolving line of credit that is due for expire in November 2012. The company intends to use the facility as a liquidity cushion and to provide financial flexibility to fund growth initiatives, consistent with its communicated strategy.

Carpenter has also entered into a definitive merger agreement to acquire Latrobe Specialty Metals for almost $558 million. Through the transaction, CRS will issue 8.1 million shares to its current owners totaling $388 million, and pay the balance in cash.

The transaction is expected to close in the first quarter fiscal 2012 ending Sept. 30, 2011. In a separate development, the company signed a 10-year agreement with Goodrich Landing Gear for the supply of AerMet 100 alloy for use in military aircraft landing gear components.

Of the nine analysts covering the stock, 56% recommend a buy, while 33% rate a hold. On average, analysts estimate 7.6% upside to $57.17 in value from current levels.

4. Patriot Coal ( PCX), a producer of thermal coal in the eastern U.S., has its operations and coal reserves in the Appalachia and the Illinois Basin. In addition to producing metallurgical coal, Patriot mines and prepares thermal coal or steam coal. The stock rose 9.7% in the past week.

During the past week, Patriot led other coal companies higher after a report that China's coal imports touched four-month highs and on speculation that equities are underpriced. China's coal imports soared 22% in May over April. In addition, a Brean Murray Carret analyst had commented that coal stocks are undervalued.

Meanwhile, Goldman Sachs has revised its outlook on the U.S. coal sector as thermal coal prices get a boost from overall higher prices and on renewed interest as an alternative source for power generation, away from nuclear. Goldman analyst Andre Benjamin has raised the sector's rating to attractive from neutral, implying an average upside of 35% for coal stocks in the second half of 2011.

Of the 17 analysts covering the stock, 53% have assigned a buy rating to the stock while 29% suggest a hold. On average, analysts estimate a 40.9% upside to $30.20 in value from current levels.

3. POSCO ( PKX), an integrated steel producer in Korea, has a product portfolio that includes hot rolled steels, steel plates, wire rods, cold rolled steels, galvanized steels, electrical galvanized steels, electrical steels, stainless steels and titanium products that are deployed in the auto, shipbuilding, consumer electronics industries, and machine structural uses, and general structures. The stock gained 6.1% last week.

The company signed an initial agreement with Mechel last week to develop energy resources in Russia and other countries. Both companies have also signed a memorandum of agreement to cooperate in the stainless steel business as Posco ventures into building stainless steel processing facilities for Mechel in Russia.

In another development, an affiliate of Samsung Electronics reportedly will partner Posco in bidding for a 37.6% stake valued $1.4 billion in The Korea Express, the country's largest logistics company by sales.

Both the analysts covering the stock have assigned a buy rating to the stock. There are no sell ratings on the stock. On average, analysts estimate 23.9% upside to $126.00 in value from current levels.

2. Harsco ( HSC), a provider of industrial services and engineered products serving global industries, has its operations divided into four segments: Harsco Infrastructure, Harsco Metals & Minerals, Harsco Rail, and Harsco Industrial. The company operates in more than 50 countries including the U.S. The stock rose 5.2% last week.

The company announced last week that it secured two major new environmental solutions contracts from one of India's largest steelmakers, JSW Steel. These contracts are valued over $135 million over 10 years, and will support Harsco's growing presence in India, as part of its emerging market growth strategies.

Meanwhile, Harsco's board of directors declared a regular quarterly cash dividend of 20.5 cents per share, or 82 cents per share, on an annualized basis. The dividend is the company's 245th consecutive quarterly cash dividend and is payable on Aug. 15, 2011.

Of the 11 analysts covering the stock, 36% suggest a buy while 55% recommend a hold. There are no sell ratings on the stock. On average, analysts estimate a 22.9% upside to $38.67 in value from current levels.

1. Horsehead Holding ( ZINC) is a producer of specialty zinc and nickel-based products that are sold primarily to customers across the U.S.

It is also a recycler of electric arc furnace dust and hazardous and non-hazardous waste for the specialty steel industry. The stock rose 4.8% last week.

The company announced last week that it intends to construct a new, low-cost, environmentally-friendly zinc production facility to replace its older smelter technology. The new facility is expected to curb greenhouse gas emissions and particulates significantly.

The facility will have capacity to produce more than 150,000 tons of zinc metal annually and will reduce manufacturing conversion costs due to less energy use, improved productivity and lower maintenance costs associated with the new technology. The facility will be completed as early as the third quarter of 2013.

Of the six analysts, 50% suggest a buy while the remaining rate a hold. There are no sell ratings on the stock. On average, analysts estimate 58.1% upside to $18.25 in value from current levels.