July 21 (Reuters) - Dundee Energy Ltd DEN.TO :
* Co, certain owned entities received notice from lenders under amended and restated credit agreement dated July 31, 2012
* Received notice demanding repayment in full on or before July 31, outstanding principal amount under credit agreement of about $57 million
* Reviewing options with legal and financial advisors with respect to how to proceed in light of demands being made by lenders
* Will continue to operate its business as usual while reviewing its options with its legal and financial advisors