NEW YORK (TheStreet) - The metals and mining sector experienced an advance-to-decliners ratio of six to 73, despite positive trends in commodity prices and strong quarterly results. With investors becoming wary of deepening U.S. debt crisis, market sentiment was subdued the past week. Aluminum Corporation of China (ACH) and Gold Fields (GFI) were among the six gainers over the week.

Meanwhile, the S&P 500 Metals and Mining Index slumped 5.9%.

Despite strong quarterly earnings recorded and favorable commodity prices past week, stocks like Patriot Coal ( PCX) and Harsco ( HSC - Get Report) slumped 24% and 13.6% respectively. Among others, coal producers like Westmoreland Coal ( WLB) and James River Coal ( JRCC) shed 12.7% and 12.5%, respectively.

Below, the stocks are stacked in the order of losers to gainers.

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5. AK Steel Holding ( AKS - Get Report), through its wholly owned subsidiary, engages in the production of flat-rolled carbon, stainless and electrical steels and tubular products. The company's operations include seven steelmaking and finishing plants located in Indiana, Kentucky, Ohio and Pennsylvania. The company's operations include European trading companies that buy and sell steel, steel products and other materials. The stock eroded 23.1% value during the week.

Past week, Moody's Investors Service assigned its junk-level ratings on AKS Steel and placed it on watch for a possible downgrade, driven by challenges associated with the slow and bumpy recovery in the steel industry. Furthermore, the company believes that stiff cost pressures, especially in iron ore and coking coal, has forced the rating agency to affirm a Ba2 rating, which is two levels into junk.

For the third quarter of 2011, the company estimates average selling price almost 1% lower, while raw material costs could surpass 2011 second-quarter levels. With these drawbacks, the company has lowered its 2011 third-quarter operating profit to $15 per ton from $46 per ton prior quarter.

However, on a positive note, of the 16 analysts covering the stock, 50% suggest a buy and 32% recommend a hold. On average, analysts estimate 36.3% upside to $16.56 in value from current levels.

4. Silver Wheaton ( SLW), a mining company, generates revenue primarily from the sale of silver and has entered into 14 long-term silver purchase agreements and two long-term precious metal purchase agreements. It operates mainly in nine business segments: silver produced by San Dimas, Zinkgruvan, Yauliyacu, Penasquito, Cozamin, Barrick and other mines, gold produced by Minto mine, and corporate operations. The stock dropped 8.7% during the week.

During the week, Silver Wheaton lowered its full-year production outlook due to a slowdown at Goldcorp's Penasquito mine in Mexico. SLW has a 25% right on the silver output from Penasquito. The company now forecasts to produce 25 to 26 million silver equivalent ounces in 2011, as compared to its previous estimate of 27 to 28 million ounces. Also, for the same reasons, Goldcorp was forced to trim its 2011 production outlook.

Silver futures weakened during the week as investors resorted to profit booking, sending silver stocks lower.

Of the 13 analysts covering the stock, 92% recommend a buy and the remaining rate a hold. There are no sell ratings on the stock. On average, analysts estimate 43.7% upside to $51.84 in value from current levels.

3. Randgold Resources ( GOLD - Get Report), engages in gold mining, exploration and related activities. The company's major activities are focused on West and Central Africa with proven and probable resources, attributable to its ownership interests in Loulo, Morila, Tongon, Gounkoto, Massawa and Kibali. The stock edged up 0.2% during the week.

During the past week, Randgold said that it would increase gold output from 440,000 ounces per year to 750,000-790,000 ounces during 2011. The company is also raising production levels at its Gounkoto mine, located in western Mali, which has delivered its first ore in mid-June.

Citigroup analyst believe that the sovereign debt woes in Europe and the U.S. could push gold prices to $2,500 per ounce and favor Randgold as an equity play for attractive returns.

Of the nine analysts covering the stock, 56% recommend a buy and 33% rate a hold. On average, analysts estimate 19.3% upside to $108.32 in value from current levels.

2. Penn Virginia Resource Partners ( PVR) engages in the management of coal and natural resource properties and the gathering and processing of natural gas in the U.S. Broadly, the company conducts its operations in two business segments: coal and natural resource management and natural gas midstream. The stock rose 0.4% on the week.

For the second quarter of 2011, the company recorded EBITDA of $64.8 million versus $442 million in the year-ago quarter. Total revenue increased 27% to $51.5 million from $40.6 million, buoyed by increased production and higher average coal royalties. Net income during the quarter grew to $35.6 million, or 50 cents per share, from $22.1 million, or 30 cents per share, in the year-ago quarter.

The company declared a quarterly cash distribution of 49 cents per share payable Aug. 12, indicating a 2.1% increase over the prior quarter and a 1.3% increase over the second quarter of 2010. The annual dividend amounts to $1.96 per share.

Of the seven analysts covering the stock, 43% suggest a buy and the remaining rate a hold. There are no sell ratings on the stock. On average, analysts estimate 9.4% upside to $30.33 in value from current levels.

1. Aluminum Corporation of China ( ACH), a producer of alumina, primary aluminum, and aluminum fabrication products in China, engages in the mining of bauxite, manufacture and distribution of alumina, primary aluminum and aluminum fabrication products, as well as trading of nonferrous metal products sourced from external suppliers. Emerging as a major gainer, the stock accumulated 6.1% during the week.

Mongolia state-owned Erdenes Tavan Tolgoi agreed to sell coal valued almost $250 million from the east Tsankhi deposit to ACH. Under the agreement, Aluminum Corp of China would resell 30% of the coal to Japanese trading houses Itochu Corp. and Mitsui, as well as state-owned Korea Resources.

Meanwhile, Tavan Tolgoi did not disclose the amount of coal that it would sell to ACH and said after 12 to 18 months when the agreement between the two company's expires, ACH would have to pay the market price for the coal.