Frik Els , Editor

Interfax reports Russia state-owned diamond miner Alrosa is up 22% on the country's trading board for unlisted stocks since it was first quoted there on July 18. The price of US$31,495 per share, implies a market value of $8.6 billion. Alrosa accounts for around 25% of world output and for the full year sales of $4.7 billion is expected. The secretive firm has been feeding the market more information recently in anticipation of a 2012 public offering that seeks to raise up to $3 billion.

24/7 Wall St says the global diamond mining industry may be one of the world’s best-kept secrets and diamond mining is not unlike the oil business, where about 100 massive fields supply about half the world’s oil.

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.

Australia's Paladin Energy has signed three new uranium sale agreements with US customers for output from the stage 3 expansion of the Langer Heinrich mine in the Namib desert (pictured).

Spot gold dropped $105 an ounce, or 5.66%, to $1,753.20 an ounce on the Comex division of the New York Mercantile Exchange in early afternoon trade on Wednesday, as investors booked profits and over disappointment about the precious metal's failure to breach $1,900. Losses over two trading days now top $120 – gold last hit a settlement record on Monday, when it finished at $1,891.90 an ounce. Gold has gained almost 25% from lows in early July and many analysts are holding to forecasts of $2,000 an ounce in the near term, but some producers have sounded caution.

BHP Billiton reported record annual results and beat analyst estimates in the process, after prices of copper, iron ore and coal reached all-time highs because of demand from China. Profit at the world's biggest miner surged 86% for the 12 months $23.6 billion, a full $1.4 billion ahead of expectations, on the back of earnings from iron ore, its biggest division, which jumped 122% to $13.3 billion.

Mountain Province Diamonds said on Wednesday it is breaking off talks with unspecified parties that showed an interest in the company and is instead focusing on advancing its Gahcho Kué project and to arrange its share of the financing which amounts to some $600 million. Shares in the little-traded company jumped almost 8% on the news.

New York brokerage GFI's announcement on Tuesday that it now offers on-screen iron ore swap trading is the latest indication that the economics of the world's foremost dry bulk commodity are being changed fundamentally. Started in 2008, derivatives trading in iron ore is up fourfold this year after setting a record in July as investment banks enter the massive market in numbers. The world's top three miners – BHP Billiton, Vale and Rio Tinto – control nearly 70% of the 1 billion tonne annual seaborne trade and dominate price talks. The benchmark China import price for iron ore has tripled since late 2008 to $177 a tonne.

Canadian Natural Resources said on Tuesday its Horizon oil sands operation has resumed production after a seven month gap caused by a fire. The Calgary-based company said expects to reach full capacity of 110,000 barrels per day of syncrude – a light oil manufactured from bitumen – by next week. The Horizon outage led to a shortage of syncrude which helped Alberta’s producers attract a premium of $18 above benchmark US oil. That premium is now shrinking and is set to return to normal levels of a slight discount. Last week the spread between US crude and North Sea Brent reached a record margin of $26 a barrel. Western Canada Select in turn trades at $13 a barrel below US levels which on Tuesday was $84 a barrel.