Regulus Commences 15,000 Metre Drill Program on Rio Grande

WATERDOWN, ONTARIO–(Marketwire – July 25, 2011) – Regulus Resources Inc. (TSX VENTURE:REG) (“Regulus), is pleased to announce that drilling is now underway on the company’s 50%-owned Rio Grande copper-gold-silver project in Salta Province, Argentina after an unusually intense winter storm in the Puna during the mobilization caused some delays. The drill program is planned for a total of 15,000 m utilizing two diamond drills. The Rio Grande project is a 50/50 joint venture between Regulus and Pachamama Resources Inc. (“Pachamama”, PMA TSX.V) with Regulus acting as the operator.

Over the last two months, the company has made significant progress in preparing the Rio Grande project for its first drill program since 2008 as well as making advancements towards obtaining its first 43-101 compliant resource estimate on the project. The following programs are now completed or are underway;

— Quantec Titan 24 geophysical IP and resistivity survey

— Completed 11 lines – Phase I report evaluation pending – 3D modelling underway

— RDI and SGS metallurgical test work

— Expecting final results from both labs in August

— Wardrop Engineering 43-101 compliant resource estimate

— Well on its way for completion in August (based on previous drilling only)

— 15,000 metre Boart Longyear diamond drilling program

— Both drills are now on site with the first drill operating

The 15,000 metre diamond drilling program will consist of 1) infill and extension drilling in the northern area of the Sofia Zone, 2) extension drilling to the west of the existing drilling in the North Zone, 3) infill and extension drilling in the # 7 Zone, 4) initial testing of the underexplored southwest portion of the Rio Grande ring structure, 5) deep drilling into the deep porphyry targets in the center of the Rio Grande ring structure.

Wayne Hewgill, President and CEO of Regulus comments: “We are very excited to be back drilling and testing the outstanding potential at the Rio Grande project after a 2 1/2 year break. During the financial crises of 2009, Antares Minerals Inc. put the project on hold to focus its exploration funding on their world-class Haquira copper-molybdenum porphyry discovery in southern Peru, which led to the sale of Antares to First Quantum Minerals Ltd. in December 2010 and the spin-out of Antares’ 50% interest in the Rio Grande project into Regulus. While earlier results from the 78 diamond drill holes on the project returned excellent results, including 189 metres grading 0.70% Cu and 0.67 g/t Au and 11 g/t Ag, we are only now anticipating completion of the first 43-101 compliant resource estimate on the property. We expect the results of the preliminary metallurgical work and the first resource estimate to be released in Q3.”

To more clearly define the deep porphyry targets in the centre of the 2.2 km wide Rio Grande Ring structure, the company contracted Quantec Geoscience to complete a 10 line, Titan 24 IP / resistivity survey covering the full extent of the Rio Grande ring structure. The IP successfully outlined the contact between the oxide and transitional material and the underlying fresh volcanic rocks and the MT survey outlined a number of high priority drill targets at depth in the central area of the Rio Grande Ring structure. An additional line was added to the survey covering the Northeast Gold target located 1.6 kilometres from the eastern edge of the Rio Grande ring structure.

About Regulus Resources Inc.

Regulus Resources Inc. (REG TSX.V) is a mineral exploration company formed in December 2010 in connection with the sale of Antares Minerals Inc. to First Quantum Minerals Ltd. Regulus is currently exploring the Rio Grande Cu-Au-Ag porphyry project in Salta Province of NW Argentina on a 50/50 joint-venture basis with Pachamama Resources Ltd.

Current Share Capital

Shares Outstanding 36,182,234 Common Shares

Shares Fully Diluted 38,746,234 Common Shares

All of Regulus’ exploration programs and pertinent disclosure of a technical or scientific nature are prepared by, or under the direct supervision of, Wayne Hewgill, P.Geo, and Regulus’ President, who serves as the qualified person (QP) under the definitions of National Instrument 43-101.

Regulus’ security, chain of custody and quality control is described on their website and can be reviewed at: http://regulusresources.com/BestPractices/SamplingMethodologies Forward Looking Information