Wentworth Resources Limited : Ziwani-1 Exploration Well Drilling Update

2 mei 2012                                                                            2 MAY 2012 WENTWORTH RESOURCES LIMITED ("Wentworth" or "the Company") ZIWANI-1 EXPLORATION WELL DRILLING UPDATE Wentworth wishes to provide an update of the Ziwani-1 exploration well in the Mnazi Bay Concession, Tanzania. The well, which was spudded on February 1, 2012, has now been drilled to a depth of 2,671 meters and full logging operations have been completed.  Further to the announcement of April 10, 2012 regarding the encountering of gas shows, the partners have identified a gas bearing zone between 1,106 and 1,109 meters and are conducting testing operations.  The zone to be tested is a new reservoir interval, not previously encountered in the Mnazi Bay Block.  The reservoir is a clean limestone of Pliocene age which exhibited strong gas shows during drilling (4.3% Total Gas). Petrophysical interpretation of wireline logs indicates a pay zone with 17% porosity and 78% hydrocarbon saturation indicating good reservoir quality.  A Drill Stem Test will be conducted to establish the flow rate which can be achieved from this reservoir interval. Although several sandstone intervals of Oligocene/Eocene age were penetrated deeper in the well, logging proved these to be water bearing. The well has now been plugged back to enable the Pliocene limestone to be tested. There can be no assurance that any flow rate achieved will prove to be commercial but the information acquired is expected to be valuable in respect of knowledge of the basin for further exploration. Wentworth will provide further information once the well test is complete. About the Mnazi Bay Concession The Mnazi Bay Concession Area is located in coastal, south-eastern Tanzania in the Ruvuma (Rovuma) Basin. The area lies between Aminex and Solo Oil's Ruvuma Concession Area and Ophir Energy and BG Group's offshore Block 1. Ophir and BG Group's Chaza-1 gas discovery lies just northeast of Mnazi Bay's marine border. The 756 km² concession area contains two discovered Tertiary aged gas fields (Mnazi Bay and Msimbati) and holds additional Tertiary, Cretaceous and Jurassic hydrocarbon potential. Five wells have been drilled to date: MB-1, MB-2, MB-3, MS-1X and Ziwani-1, and all five wells encountered hydrocarbons. MB-1 is currently producing gas at a rate of 1.7-2.0mmscf/d and this gas is transported via an 8", 27 kilometre pipeline to the Mtwara Power Plant where it generates electricity for numerous local communities. END Enquiries: Wentworth Bob McBean, Executive Chairman rpm@wentworthresources.com     Eric Fore, Finance, Investor & etf@wentworthresources.com Public Relations Manager Panmure Gordon Nominated adviser & broker +44 (0) 20 7459 3600     Katherine Roe Brett Jacobs FirstEnergy Broker +44 (0) 20 7448 0200 Capital   Majid Shafiq Travis Inlow College Hill Investment relations adviser +44 (0) 20 7457 2020     Nick Elwes Catherine Maitland Alexandra Roper Axxept Investment relations adviser +47 (0) 99 22 0200     Per Arne Totland About Wentworth Resources Wentworth Resources is a publicly traded (AIM:WRL, OSE:WRL), independent oil & gas company with:  natural gas production; midstream and downstream assets; a committed exploration and appraisal drilling programme; and large-scale gas monetization programmes, all in the Rovuma Delta Basin of coastal southern Tanzania and northern Mozambique. FORWARD LOOKING STATEMENTS This press release may contain certain forward-looking information.  The words "expect", "anticipate", "believe", "estimate", "may", "will", "should", "intend", "forecast", "plan", and similar expressions are used to identify forward looking information. The forward-looking statements contained in this press release are based on management's beliefs, estimates and opinions on the date the statements are made in light of management's experience, current conditions and expected future development in the areas in which Wentworth is currently active and other factors management believes are appropriate in the circumstances. Wentworth undertakes no obligation to update publicly or revise any forward-looking statements or information, whether as a result of new information, future events or otherwise, unless required by applicable law. Readers are cautioned not to place undue reliance on forward-looking information. By their nature, forward-looking statements are subject to numerous assumptions, risks and uncertainties that contribute to the possibility that the predicted outcome will not occur, including some of which are beyond Wentworth's control.  These assumptions and risks include, but are not limited to: the risks associated with the oil and gas industry in general such as operational risks in exploration, development and production, delays or changes in plans with respect to exploration or development projects or capital expenditures, the imprecision of resource and reserve estimates, assumptions regarding the timing and costs relating to production and development as well as the availability and price of labour and equipment, volatility of and assumptions regarding commodity prices and exchange rates, marketing and transportation risks, environmental risks, competition, the ability to access sufficient capital from internal and external sources and changes in applicable law.  Additionally, there are economic, political, social and other risks inherent in carrying on business in Tanzania and Mozambique. There can be no assurance that forward-looking statements will prove to be accurate as actual results and future events could vary or differ materially from those anticipated in such statements. See Wentworth's Management's Discussion and Analysis for the year ended December 31, 2011, available on Wentworth's website, for further description of the risks and uncertainties associated with Wentworth's business. NOTICE Neither the Oslo Stock Exchange nor the AIM Market of the London Stock Exchange has reviewed this press release and neither accepts responsibility for the adequacy or accuracy of this press release. This information is subject of the disclosure requirements pursuant to section 5-12 of the Norwegian Securities Trading Act. 2012 05 02 Press Release: http://hugin.info/136496/R/1607808/510067.pdf This announcement is distributed by Thomson Reuters on behalf of Thomson Reuters clients. The owner of this announcement warrants that: (i) the releases contained herein are protected by copyright and other applicable laws; and (ii) they are solely responsible for the content, accuracy and originality of the information contained therein. Source: Wentworth Resources Limited via Thomson Reuters ONE [HUG#1607808]