Africa Oil Announces Etuko-1 Well Spuds in Kenya

 Africa Oil Corp. (TSX VENTURE:AOI)(NASDAQ OMX:AOI) ("Africa Oil" or the "Company") is pleased to announce that Tullow Oil Plc, the operator of Block 10BB in Kenya, has commenced drilling at the Etuko (formerly Kamba) prospect. This well will target a new play area in the Lockichar Basin where a working petroleum system has been confirmed by recent discoveries at Ngamia and Twiga. The well will focus on the 'eastern flank play' where oil was discovered in 1992 by Shell at the Loperot-1 well. The primary objectives will be the Lower Lokhone and Auwerwer sands, both of which have been shown to be high quality reservoirs containing oil in existing wells. The gross best estimate of prospective resources for the prospect are 231 million barrels of oil based on a third-party Competent Person's Report*. The well is expected to take approximately 60 days to drill and evaluate.

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GASFRAC Announces First Quarter 2013 Results

MANAGEMENT'S DISCUSSION AND ANALYSIS

MARCH 31, 2013

Management's discussion and analysis ("MD&A") of the financial condition and the results of operations should be read in conjunction with the unaudited interim condensed consolidated financial statements for the three months ended March 31, 2013 and the consolidated financial statements for the year ended December 31, 2012 of GASFRAC Energy Services Inc. ("GASFRAC" or the "Company") (GFS.TO), together with the accompanying notes. The interim condensed consolidated financial statements have been prepared in accordance with International Financial Reporting Standards ("IFRS") including International Accounting Standard ("IAS") 34, "Interim Financial Reporting" as issued by the International Accounting Standards Board ("IASB").

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Bankers Petroleum Announces 2013 First Quarter Financial and Operational Results

Realised Free Cash Flow and Record Production; Current Production 17,500 bopd

Bankers Petroleum Ltd. ("Bankers" or the "Company") (TSX: BNK, AIM: BNK) is pleased to provide its 2013 first quarter financial and operational results.  During the quarter, Bankers achieved several key milestones, including its first quarter of free cash flow and record production levels.

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Insignia Energy Ltd. Announces Receipt of Proposal for Going Private Transaction

Insignia Energy Ltd. ("Insignia" or the "Company") (ISN.TO) today announced that the independent members of the board of directors of the Company have received a proposal (the "Proposal") from Brookfield Capital Partners Ltd. ("Brookfield") to privatize Insignia. Under the Proposal, all shareholders of Insignia, other than those participating in the Proposal, would receive $1.35 cash for each of their common shares of Insignia ("Common Shares"). The proposed offer price translates into a premium of 95% based on the weighted average trading price of the Common Shares on the Toronto Stock Exchange ("TSX") for the previous twenty (20) trading dates ended May 3, 2013.

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Gran Tierra Energy Inc. Announces Record First Quarter 2013 Results

Major Oil Discovery in Peru; Production, Revenue, Net Income and Funds Flow from Operations Reach New Highs

Gran Tierra Energy Inc. ("Gran Tierra Energy") (NYSE MKT: GTE, TSX: GTE), a company focused on oil and gas exploration and production in South America, today announced its financial and operating results for the quarter ended March 31, 2013. All dollar amounts are in United States ("U.S.") dollars unless otherwise indicated.

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