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Message: NR-GTE Confirms Oil Discovery at Moqueta-1 in Colombia

Gran Tierra Energy Confirms Oil Discovery at Moqueta-1 in Colombia

	    Development plans initiated to prepare for long term testing

	    CALGARY, June 28 /CNW/ - Gran Tierra Energy Inc. (AMEX: GTE; TSX: GTE), a
company focused on oil exploration and production in South America, today
announced that it had completed initial testing of the Moqueta-1 exploration
well, a new field discovery on the Chaza Block in the Putumayo Basin,
Colombia, while preparations to drill the Moqueta-2 appraisal well are under
way. Gran Tierra Energy has a 100% working interest and is the Operator of the
Chaza Block.
	    "The successful discovery of oil with the first well in Gran Tierra
Energy's 2010 exploration program further reinforces the strength of our
exploration portfolio," said Dana Coffield, President and Chief Executive
Officer of Gran Tierra Energy Inc. "We are preparing to drill a second well
and initiate a 3-D seismic acquisition survey in the area to give us further
information on the size and productive capacity of the new discovery. Finally,
planning to initiate long term testing has begun, with early production
anticipated in the first quarter of 2011."


	    Gran Tierra Energy has completed initial testing on Moqueta-1 by
collecting reservoir data and fluid samples from two zones - the lower
Caballos Formation and the Villeta T Sandstone. The Caballos Formation has 53
feet of total hydrocarbon pay, subdivided into 27 feet of net gas pay in the
Upper Caballos and 26 feet of net oil pay in the Lower Caballos. A 20 foot net
(39 feet gross) interval, in the lower portion of the lower Caballos oil
bearing interval was tested and perforated from 3,950 feet to 3,970 feet
measured depth. A variety of tests were performed resulting in natural flow
rates, without pumps, of up to 349 barrels of oil per day with a 32/64 inch
choke and a 0.2% watercut with 29 degrees API gravity oil.
	    In the Villeta T Sandstone, a short 12 foot (3,734 feet to 3,746 feet
measured depth) interval of the 55 feet of net gas pay was perforated and
tested at 13 million standard cubic feet per day using a 48/64 inch choke
size. No additional gas testing was conducted in the T Sandstone in order to
preserve the casing integrity for future oil production from the Lower

	    Appraisal Plan

	    Planning is underway to construct an 8 kilometer pipeline to tie
Moqueta-1 into the Costayaco infrastructure, with anticipated initiation of
long term oil testing and early production in the first quarter of 2011.
	    The drilling rig is currently being mobilized to drill Moqueta-2, an
appraisal well to be drilled from the existing Moqueta-1 pad. The bottom-hole
location is planned to be approximately 270 meters east of the Moqueta-1
bottom-hole location. The objective is to delineate the volume of the lower
Caballos oil pool by targeting the reservoir approximately 60 feet deeper down
the flank of the structure. Moqueta-2 will also test the potential for a
gas/oil contact in the Villeta U, Villeta T and upper Caballos zones down
	    Pending results from Moqueta-2, Moqueta-3 would be drilled from a new pad
location approximately 1.5 kilometers southwest of the Moqueta-1 surface
	    A 230 square kilometer 3D seismic survey is scheduled to be conducted to
cover the Moqueta discovery and adjacent prospects and leads. This survey will
overlap existing 3D surveys that cover the Costayaco Field in the Chaza Block;
the Juanambu, Toroyaco, Linda, Mary, and Miraflor Fields in the adjacent Gran
Tierra Energy operated Santana and Guayuyaco Blocks; as well as the upcoming
Verdeyaco 3D survey on the Chaza and Guayuyaco Blocks.

	    OTA Pipeline Update

	    Gran Tierra Energy is also pleased to announce the OTA pipeline has been
repaired, with deliveries expected to resume in the coming week.

	    About Gran Tierra Energy Inc.

	    Gran Tierra Energy Inc. is an international oil and gas exploration and
production company, headquartered in Calgary, Canada, incorporated in the
United States, trading on the NYSE Amex Exchange (GTE) and the Toronto Stock
Exchange (GTE), and operating in South America. Gran Tierra Energy holds
interests in producing and prospective properties in Argentina, Colombia and
Peru, and has opened a business development office in Rio de Janeiro, Brazil.
Gran Tierra Energy has a strategy that focuses on establishing a portfolio of
producing properties, plus production enhancement and exploration
opportunities to provide a base for future growth.
	    Gran Tierra Energy's Securities and Exchange Commission filings are
available on a web site maintained by the Securities and Exchange Commission
at http://www.sec.gov and on SEDAR at http://www.sedar.com.

	    Forward Looking Statements:

	    This news release contains forward-looking information, forward-looking
statements and forward-looking financial outlook (collectively,
"forward-looking statements") under the meaning of applicable securities laws,
including Canadian Securities Administrators' National Instrument 51-102 -
Continuous Disclosure Obligations and the United States Private Securities
Litigation Reform Act of 1995. The use of the words "will", "planning",
"anticipated" and "would" identify these forward-looking statements. These
forward-looking statements are statements made with respect to Gran Tierra
Energy's expectations and plans regarding drilling, testing, seismic
acquisition, production, and construction of pipeline.
	    The forward-looking statements contained in this news release are subject
to risks, uncertainties and other factors that could cause actual results or
outcomes to differ materially from those contemplated by the forward-looking
statements, including, among others: Gran Tierra Energy's operations are
located in South America, and unexpected problems can arise due to guerilla
activity, technical difficulties, operational difficulties which could impact
its time schedule for acquiring seismic data and testing and drilling
operations; geographic, political and weather conditions can impact testing
and drilling operations; and the risk that current global economic and credit
market conditions may impact oil prices and oil consumption more than Gran
Tierra Energy currently predicts, which could cause Gran Tierra Energy to
modify its exploration activities. Further information on potential factors
that could affect Gran Tierra Energy are included in risks detailed from time
to time in Gran Tierra Energy's Securities and Exchange Commission filings,
including, without limitation, under the caption "Risk Factors" in Gran Tierra
Energy's Quarterly Report on Form 10-Q filed May 10, 2010. These filings are
available on a Web site maintained by the Securities and Exchange Commission
at http://www.sec.gov and on SEDAR at www.sedar.com. The forward-looking
statements contained herein are expressly qualified in their entirety by this
cautionary statement. The forward-looking statements included in this press
release are made as of the date of this press release and Gran Tierra Energy
disclaims any intention or obligation to update or revise any forward-looking
statements, whether as a result of new information, future events or
otherwise, except as expressly required by applicable securities legislation.

	    /For further information: Additional information is available on Gran
Tierra Energy's website at www.grantierra.com; For media and investor
inquiries please contact Jason Crumley, Director, Investor Relations at
403-265-3221 or [email protected]/
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