Gold for December delivery fell more than $50 to $1,710 an ounce in afternoon trade in London on Thursday, bring its losses since the record high of Monday to 10%, the worst slump since March 2008. On Wednesday, the Chicago stock exchange operator CME followed a move by the Shanghai Gold Exchange by increasing the margin requirement as a way to “ensure adequate collateral coverage.” The minimum cash deposit to borrow from brokers to trade gold futures will rise 27% to $9,450 per 100-ounce contract at the end of today. Silver slumped as much as 35% in London in about three weeks from its April 25 record of $49.79 an ounce after CME announced margin increases.

South Africa's Impala Platinum Holdings (Implats) said on Thursday that its headline earnings for the 2011 financial year rose 41% as it reaped the benefit of rising prices. The world's second-largest producer of the metal also said Thursday that it expects output in 2012 to be steady or slightly lower on the year and that costs will likely rise. Implats accounts for close to 30% of global supply of the precious metal sometimes referred to as white gold, used in vehicle emission systems to reduce pollution and for the manufacture of jewellery. Prices for platinum climbed throughout the year from just over US$1,500 per ounce to end at about US$1,800 per ounce.

The U.S. State Department's final environmental review of a proposed Canada-to-Texas oil pipeline will affirm an earlier finding that the project will have "limited adverse environmental impacts," The Washington Post reported on Wednesday.

One of the largest mining companies operating in northern Peru says that a 7.0-magnitude earthquake that hit Peru Wednesday didn't interrupt operations. Roque Benavides, chief executive of precious metals mining company Compania de Minas Buenaventura SA (BVN, BUENAVC1.Vl), said in an email message he wasn't aware of any damage from the earthquake on its operations in northern Peru.

Amid pressure from the Greens for the government to make the mining tax even harsher, the Prime Minister today urged Tony Abbott to force the mining industry to share the benefits of the boom. “Is this really a time for anybody to come to this parliament and say the MRRT should be opposed ... in view of the profitability of mines and the pressures we know are on other sections of the economy because of the high Aussie dollar?” she said. “That is a strategy for wrecking.”

A top executive at Saskatchewan PotashCorp says potash producers will not be able to meet the 2011 world supply capability of 61 million tonnes. David Delaney, PotashCorp executive vice-president and chief operating officer, said in a conference call Tuesday that "hitting the target would have required "perfect production, very little downtime. When you're pulling all these operations around the world that hard, it's really difficult to do."

Balmoral Resources Ltd. ("Balmoral" or the "Company") (TSX VENTURE:BAR) reported results from the first six holes of its summer 2011 drill program on the Martiniere Gold Property located along the Detour Gold Trend in Quebec.

BHP Billiton, owner of the Ekati diamond mine, reported revenues of $1.01 billion from diamond sales in the fiscal ear ending June 30, 2011, a 12.1 percent increase from the previous year.

Mining company Rio Tinto PLC (RIO) Wednesday raised its ownership stake in Canada-based Ivanhoe Mines Ltd (IVN.T) by 2% to 48.5% as it sought to cement its commitment to the massive Mongolian Oyu Tolgoi copper-gold project. Rio Tinto paid C$18.98 a share and exercised its subscription right to the tune of C$529.5 million in order to increase its take in Ivanhoe Mines, the majority owner of the Oyu Tolgoi project.