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The paper reviews the existing and potential recovery methods for heavy-oil and tar sand resources with emphasis on those methods that are now commercial, i.e., steamflooding, in situ combustion, and surface mining of tarsands.

The outlook for heavy-oil production in the United States is very promising. Ultimate recovery is estimated to range from 4.2 to 10.5 billion barrels. Actual recovery of heavy oil would be even higher because some of the heavy oil is produced by primary and secondary methods, which are not included in the above figures.

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