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A Report on the Athabasca Tar Sands and U.S. Demands for Canada's Energy
The Athabasca tar sands of northern Alberta contain an estimated 175 to 200 billion barrels of recoverable oil — the largest known hydrocarbon deposit ever discovered. This estimate is based on using existing technologies. Using newer technologies, as much as 2.5 trillion barrels of oil might be recovered — but the costs would be enormous.