For companies that have oil sands assets, it hasn't been a good year so far. Marathon Oil (NYSE:MRO) just announced that the company couldn't get any takers for a 25% interest in its oil sands project. Not that it keeps Marathon from trying again, but it will be difficult. In the past year, three major oil sands exploration companies have either shelved expansion projects or have completely pulled out of the region. 

With oil sands trading at a deep discount to other North American oil sources, exploration companies aren't seeing the value in oil sands today. In this video, contributors Tyler Crowe and Aimee Duffy discuss the woes of oil sands and what it will take to get them going again.

Fool contributors Aimee Duffy and Tyler Crowe have no position in any stocks mentioned. You can follow them both on Twitter, @TMFDuffy and @TylerCroweFool, respectively.

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