Black Rock Drills Arrinconada, Finds No Significant Shows

Black Rock Oil and Gas PLC, the AIM-traded oil and gas exploration and production company, previously announced that its joint venture operator, Kappa Resources Colombia Ltd ("Kappa") commenced preparation for drilling of the Arrinconada 1 exploration well in the Alhucema E&P Contract in Colombia on 8th April 2008.

Following a short drilling program, Arrinconada 1 reached basement at 2222 feet True Vertical Depth on 20 April 2008. No significant hydrocarbon shows were recorded whilst drilling the objective formations. The Operator completed drilling and logging of the well and then abandoned the well on 26 April 2008. The Joint Venture will now consider the next steps in the exploration of the Alhucema Block.

The cost of the Arrinconada well was covered under the conditional investment made by Prospero Hydrocarbons Inc and announced on 4 March 2008.

Dr John Cubitt, Managing Director of Black Rock Oil & Gas plc, commented, "We are assessing the sonic log from the Arrinconada 1 well in conjunction with the current 2D seismic grid, and will evaluate the need for additional seismic to refine structural mapping of the many remaining leads in the large Alhucema E&P Contract area."