Raw materials demand from Asia -- particularly India and China, the world's most voracious buyer of metals and minerals -- has helped lift commodities prices around the world. Copper, chiefly used in electrical wire, has especially benefited, and sales to Asia have in effect bankrolled Freeport ever since the financial crisis laid the rest of the world's economies low. Also Wednesday, BHP Billiton ( BHP) issued its performance review of the first quarter, saying iron ore shipments were up 7% from a year ago, though coking coal production, nearly halted by devastating floods in Australia early in the year, fell by 18%. On Tuesday, the Canadian diversified miner Teck Resources ( TCK) presaged Freeport's bullish first-quarter report with a bullish one of its own. Teck shares were rising 2.5% in Wednesday's premarket after gaining more than 7% in the previous session. -- Written by Scott Eden in New York >To contact the writer of this article, click here: Scott Eden. >To follow the writer on Twitter, go to http://twitter.com/ScottEden. >To submit a news tip, send an email to: email@example.com.