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A slipping supply of a gas used in plastic manufacturing has prompted a Canadian petrochemical factory to pursue stocks from a North Dakota plant. And another Canadian company is proposing a 430-mile-long pipeline to move the ethane north in late 2012.

Nova Chemicals Corp. says it has signed a long-term agreement to purchase 100 percent of the ethane produced at Hess Corp.'s natural gas plant in Tioga.

Nova Chemicals also has reached a shipping agreement with Calgary-based Mistral Energy Inc.

Mistral spokesman Gordon Salahor says his company is proposing a $300 million pipeline to move the liquid gas from Tioga to Alberta.

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