Announces Initial Drilling Results in Talca and Commences Drilling at Pantanillo in Chile

                                                                                                              News Release 

Orosur Mining Inc.

Announces Initial Drilling Results in Talca and Commences Drilling at Pantanillo in Chile

SANTIAGO, Chile, March 6, 2012 – Orosur Mining Inc. (the "Company") (TSX VENTURE: OMI) (LSE: OMI) a South American-focused gold producer and explorer, announces results of the drilling campaigns at its projects in Chile: Talca, Pantanillo and Anillo.

Highlights

• Initial assay results from three holes drilled during 2012 at the Talca project in Chile have defined 2 meters at 5.7 g/t Au in hole number Talca 12-23-RC on the Metallera fault and two intercepts of 1 meter at 10 g/t Au in holes Talca 12-29-RC and Talca 12-30-RC in the southern sector. These results are encouraging and consistent with expectations for these targets.
• A 3,000 meter drill campaign has commenced at the Pantanillo project in Chile. Three targets will be tested during this programme – Pantanillo Sur, Oro 52 and Quebrada Pantanilio. Recent sampling and mapping supports the potential for discovery on these targets and follows up historical drilling and trenching on these targets by previous operators.
• David Fowler, CEO of the Company commented: “Initial drilling in the southern sector at Talca is encouraging with intercepts confirming the potential for multiple narrow high grade gold mineralization over a potential strike length of 500 meters. This sector and the Metallera central zones which have been significant historical production areas are the focus of current drilling. Drilling has also commenced at the Pantanillo project on three priority targets, Pantanillo Central, Oro 52 and Quebrada Pantanillo. 3,000 meters of RC drilling will target the discovery of new oxide resources. Results of this program are expected to be received in May and June 2012.

Talca – Chile

A second drill campaign at Talca commenced in January 2012. To date, 4,000 meters of RC and diamond holes have been drilled from a planned 7,900 meters in the second campaign, giving a total since drilling began in October 2011 of 8,500 meters combined diamond and RC drilling. An additional diamond rig has been mobilized to the project in order to speed-up drilling and to complete the total planned meters before mid-April 2012.

The second phase of drilling has been focused around the Metalera Central and Sector Sur sheared quartz-veins, both areas with the most intense historical mining activity. Drilling has been planned to delineate the down-dip potential of gold mineralization beneath the historical workings, which extend to a maximum of approximately 100m vertical depth from surface. Significant intercepts from the second phase of drilling to date can be seen in the table below Hole ID Sector From To Intercept Talca-12-23RC 175 180 5m @ 2.70 g/t Au Metalera Central including ¹⁷⁸ 180 2m @ 5.62 g/t Au 112 113 1m @ 10 g/t Au Talca-12-29RC Delirio 242 244 2m @ 1.15 g/t Au 247 249 2m @ 1.32 g/t Au Talca-12-30RC Juica W 85 86 1m @ 10 g/t Au

The results from drill hole Talca-12-23RC reflect the nature of mineralization along the Metalera Fault with lower grade, 2-3 g/t Au, across the 5-7m wide structure with an increase in grade observed around the footwall contact. This result is encouraging as the intercept is situated approximately 50 meters beneath the extent of the historical workings at this point of the Metalera Fault and mineralization is still open down-dip.

Drill holes Talca-12-29RC and Talca-12-30RC are also encouraging as both holes were drilled as exploration holes testing the potential of the western extension in the Sector Sur sheared vein sets, in this case, the Delirio and Juica veins respectively. The ground across this particular zone has not previously been subject to any historical mining. These intercepts of >10 g/t gold are over 500m west of the intersection between the vein sets and the Metalera Fault system. Assays for other holes drilled in Sector Sur are pending with results expected by the end of March.

The Company’s objective is to define the first Inferred NI-43101 resource calculation during calendar 2012.

Pantanillo – Chile

Orosur has a measured and indicated resource of 45.9 million tonnes at .69 g/t for 1.023 million contained ounces of gold at the Pantanillo project in the Maricunga belt of Chile. On the 12th of January 2012 the results of a preliminary economic assessment of the project were announced. The major focus of exploration in the 2012 field season which commenced in January 2012 is to identify areas where additional resources can be established to increase potential mine life at Pantanillo before proceeding with the completion of a prefeasibility study on Pantanillo. Three key targets will be the focus of field work at Pantanillo this year, Pantanillo Central, Quebrada Pantanillo and Oro 52. Exploration on these new target areas continued through January and February 2012, with further mapping and rock sampling.

The most significant results from the sampling campaign are shown below. Drill targets have been delineated as a result of the surface work with a planned 3,000m RC drilling commencing on 5^th March 2012. This exploration drilling campaign is to be executed in tandem with water exploration drilling, which is due to commence on 12^th March 2012.

Sample

North

Quebrada EX75385 925 15 Pantanillo 497962 6963781 24,389 207 >50,000 239 Quebrada EX75386 129 28 Pantanillo 497988 6963772 27,808 155 32,125 218 Quebrada EX75387 504 47 Pantanillo 497956 6963764 20,442 729 20,423 766 Quebrada EX75388 72 19 Pantanillo 497960 6963754 36,110 225 21,491 199 EX75437 Pantanillo Central 493529 6962921 4,886 779 597 39 2,984 34 EX75438 Pantanillo Central 493539 6962900 6,648 2,591 580 101 2,363 35 EX75439 Pantanillo Central 493572 6962857 5,222 272 1,646 59 6,507 6 EX75440 Pantanillo Central 493541 6962642 27,858 426 3,054 64 11,272 13

The rock sample results reflect the differing styles of mineralization that occur within the Pantanillo district. Oro 52 results shows anomalous gold values that are weaker, in comparison to Pantanillo Central and Quebrada Pantanillo, however, the values appear more consistent and are coupled with lower anomalous silver values. The conceptual model for Oro 52 is that of a porphyry system similar to Pantanillo Norte, with lower background anomalies and buried beneath post-mineral superficial cover.

Mineralization at Quebrada Pantanillo visually appears to be a classic hydrothermally altered highsulphidation system normally observed around the peripheries of porphyry systems. This has now been backed-up by the significant results in the area with high grade silver-mercury and moderate anomalies of gold. A soil sampling campaign will take place along with the exploration drilling at Quebrada Pantanillo, targeting further potential mineralized areas that are highlighted by intense alunite-kaolinte alteration in Aster® imagery. Hypogene alunite alteration is typically observed throughout the whole of the Maricunga belt, associated with advanced argillic alteration caps that overlay gold bearing porphyry-type stockwork systems. Kinross drilled a combined total of 1,235 meter diamond and RC holes in Quebrada Pantanillo during their 2006 and 2007 field campaigns. One hole in particular stands out, DDHQP-02, which intercepted 25.9m @ 0.6 g/t Au, between 98-123.9m depth. More significantly, this drill hole was terminated in mineralization. This drill information together with encouraging rock sample results provide significant encouragement for the potential to make a discovery at Quebrada Pantanillo.

Pantanillo Central exhibits encouraging gold results and moderate to high grade silver and mercury. This high-sulphidation style of mineralization is similar to that observed at Quebrada Pantanillo and together with the high-grade silver results seen in historical trenching done by Anglo-American, justifies the need to drill test this area. The table below shows significant results from some of the trench samples* taken by Anglo-American in the mid-1980s

Trench ID East_PSAD56 North_PSAD56 Length(m) Au g/t Ag g/t

• Taken from Anglo-American data, in which they presented only data above cut-off grades 0.5 g/t Au

and/or 30 g/t Ag.

Anillo – Chile

Anillo is strategically placed tenement package between Yamana’s El Peñon mine and its Pampa Augusta Victoria discovery. A total of 7,173 meters of reverse circulation drilling over two campaigns has been drilled with a number of anomalous intercepts. Further exploration work has been planned from May 2012, targeting potential NNE strike extension of the El Peñon mineralized structure that appears, from ground magnetic geophysics and selected float sampling, to pass through the western part of Anillo. A programme of detailed mapping and approximately 1,000 meters of trenching will be carried out to further define drill targets.

Qualified Person's Statement

The information presented in this press release has been reviewed by Mr. Randall Corbett, General Manager, San Gregorio, and is considered to be in compliance with NI 43-101 reporting guidelines. Mr. Corbett has a Bachelor of Engineering (Mining) Degree from Technical University of Nova Scotia (T.U.N.S.), is a Professional Engineer (P. Eng.) registered in the Province of Ontario and has more than 25 years operational, engineering and development experience.

Forward Looking Statements

All statements, other than statements of historical fact, contained or incorporated by reference in this news release, including any information as to the future financial or operating performance of the Company, constitute “forward-looking statements” within the meaning of certain securities laws, including the “safe harbour” provisions of the Securities Act (Ontario) and the United States Private Securities Litigation Reform Act of 1995 and are based on expectations estimates and projections as of the date of this news release. There can be no assurance that such statements will prove to be accurate, such statements are subject to significant risks and uncertainties, and actual results and future events could differ materially from those anticipated in such statements. Forward-looking statements include, without limitation success of exploration activities; permitting time lines; the failure of plant; equipment or processes to operate as anticipated; accidents; labour disputes; requirements for additional capital title disputes or claims and limitations on insurance coverage. The Company disclaims any intention or obligation to update or revise any forward looking statements whether as a result of new information, future events and such forward-looking statements, except to the extent required by applicable law.

ENDS 

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

About Orosur Mining Inc.

Orosur Mining Inc. is a fully integrated gold producer and exploration company focused on identifying and developing gold projects in Latin America. The Company operates the only producing gold mine in Uruguay (San Gregorio), and has assembled an exploration portfolio of high quality assets in Uruguay and Chile. The Company is quoted in Canada (TSX-Venture Exchange: OMI) and London (AIM: OMI).

For further information, please contact:

Orosur Mining Inc

David Fowler, CEO Ignacio Salazar, CFO + 56 2 9246800; [email protected]

or

Canaccord Genuity Limited (Nominated Adviser & Broker)

+44 (0) 20 7050 6500 Rob Collins Bhavesh Patel

or

Blythe Weigh Communications (Investor Relations)

Tim Blythe: +44 (0) 7816 924626 Matthew Neal: +44 (0) 7917 800011