Allan Markin hosts Gates and Buffett in Alberta

Up for a visit to the oil sands, billionaire buddies Bill Gates and Warren Buffett were hosted by Canadian Natural Chairman and one of Canada's richest men, Allan Markin.

Buffett and Gates - who were first and third, respectively, on the world's richest people list in the March edition of Forbes Magazine - were hosted by a group that included Canadian Natural Resources Ltd. and the Canadian Association of Petroleum Producers (CAPP) at Canadian Natural's $9.3-billion Horizon oilsands development.

Representatives from CAPP made a presentation to the American power duo, who were pegged by Forbes in the spring as having a collective net worth of a cool $120 billion U.S. and who could be looking for secure places to make resource-related investments now that the U.S. dollar seems to be recovering.

Spokeperson Rob Larson, from Canadian Natural Resources Ltd. confirmed that the tour did take place, but would not comment on details.