Anyone who follows ERHC closely would have known that CEPSA/ERHC were required to surrender 25% of Block 11A at the end of the Initial Exploration Period on the block. That surrendered portion became Block 11AA.
And I don't know who "sting-pin" is, but someone did point out the post-surrender configuration of Block 11A in this post, "It also indicates that CEPSA/ERHC chose to relinquish the southeastern portion of the block."
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