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Orbis Gold Limited (ASX:OBS) has appointed Merrill Lynch as its defence advisor after it received a number of confidential approaches.The gold explorer says the approaches came at the corporate and asset level and that there are no assurances the approaches will lead to an offer being made.The company says it’s committed to advancing its Natougou Gold Project in Burkino Faso and to growing its resource inventory.Orbis reported a net loss of $8.8 million in the 2014 financial year.