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Petra Diamonds is a leading supplier of rough diamonds, with a gross resource base of 262 million carats. Petra Diamonds Company offers a unique growth profile within the diamond sector, increasing its annual production fivefold in the year to June 2009 to over one million carats, and with firm plans in place to grow production to over three million carats.Petra has a well-diversified portfolio, with majority interests in seven producing mines: six in South Africa (Cullinan, Koffiefontein, Kimberley Underground, Helam, Sedibeng and Star) and one in Tanzania (Williamson).Petra conducts all its operations according to the highest ethical standards, and will only work in countries which are members of the Kimberley Process. Petra Diamonds Company is quoted on the AIM market of the London Stock Exchange (AIM: PDL).

Powertech Uranium has traded stainless steel and boilers for something a little more radioactive. Powertech Uranium company, formerly called Powertech Industries, sold off subsidiary Gasmaster Industries -- a maker of stainless steel products, condensing boilers, and water heaters -- in 2005. In 2006 the company acquired Denver Uranium Company, a uranium-exploration firm focused exclusively on the Dewey Burdock deposit in South Dakota. In 2007 Powertech Uranium's uranium holdings covered more than 59,000 acres in the western US.

Rex Diamond Mining explores and develops diamond properties in Africa. In Africa Rex Diamond company primarily has operations in Sierra Leone. It sold its exploration assets in South Africa to African Gem Resources (Afgem) in 2005 and currently is in a legal dispute with that company about royalty payments. Rex Diamond's main asset now is its investment in Afgem, though its REXdiamonds subsidiary markets and sells polished diamonds and jewelry.

Rockwell Diamonds used to prefer copper, but perhaps understandably is getting into diamonds. In mid-2006 Rockwell Diamonds company acquired four diamond mining projects in Africa, one in Congo and the other three in South Africa. It still does own a property in Chile that it hopes to develop and produce copper from, but Rockwell Diamonds company is so convinced that diamonds are its future that it changed its name from Rockwell Ventures in 2007. The next year Pala Investments offered $85 million to buy Rockwell; Pala's primary business is investing in natural resources companies. Rockwell rejected the offer as insufficient.

Snowfield Development surely wouldn't mind a little ice across its path. Snowfield Development company explores and develops diamond properties in Quebec and the Northwest Territories. Its Ticho project in the Northwest Territories is the company's most advanced property. Snowfield Development is also exploring for gold at the Snow property in British Columbia and agreed to buy a Finnish silver project in 2009.

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