According to Roger Conrad and Yiannis Mostrous, "Resource stocks are by nature volatile. The important thing is we're still very much in a long-term bull market. And when the market mood does shift, today's pain will convert very quickly to massive gain."

In Vital Resource Investor they explain, "There is ongoing consolidation in this sector and the recent setback in stock prices make deals more attractive for acquirers." Here, they look at Companhia Vale do Rio Doce (NYSE: RIO), a play on consolidation in the iron ore industry.

"And when the market mood does shift, today's pain will convert very quickly to massive gain. The long-term underpinnings for vital resources are strong as ever: Soaring demand from the world's emerging growth engines, a growing scarcity of easily accessed supplies, rising development costs, resurgent resource nationalism and ongoing sector consolidation.

"It's this last trend that's captured our attention lately. Importantly, when it comes to developing vital resources profitably, size is essential. This year has already witnessed two mega-deals: Freeport Copper & Gold (NYSE: FCX) has bought Phelps Dodge and Rio Tinto (NYSE: RTP) purchased Alcan.

"And we're certain to see many more announced in coming months. The recent dance between BHP Billiton (NYSE: BHP) and its giant rival suggest the need to get bigger is greater than ever. Even if it doesn't succeed, the proposed merger is already increasing rivals' urge to merge.