Orosur Mining Regulatory News (OMI)

14 Feb 2011 10:33

Orosur Mining Inc Announces

Exploration Update

MONTEVIDEO, Uruguay 14 February 2011. Orosur Mining Inc. ('OMI' or 'the Company') (TSX-V: OMI) (AIM: OMI), a South American-focused gold producer and explorer, announces an exploration update for its Chilean and Uruguayan exploration programs.

Highlights

Results have been received for approximately 50% of the ongoing Sobresaliente drill program. Best gold intercepts include hole SSRC039 that reported 5 meters at 14.8 g/t Au from 84 meters, including 1m at 64.29 g/t Au and hole SSRC045 that reported 23 meters at 1.64 g/t Au from 157 meters. A first pass drill program of 2,497 meters of reverse circulation drilling was completed at the Anillo project. Anomalous results were reported in two of the five targets tested and this drilling indicated the presence of high level, low temperature epithermal mineralization at shallow depths below surface. Deeper drilling planned for May 2011. OMI has commenced a planned 6,500 meter summer drilling program at the Pantanillo project.

David Fowler, CEO of the Company commented: "The first half of our drill program on the Sobresaliente project has confirmed the existing resources on the project and identified a number of new positive intercepts outside the existing resource such as hole SSRC045 which contained 23 meters at 1.64 g/t Au. The first pass drill program at Anillo tested five targets to a depth of up to 200 meters. Anomalous, low temperature epithermal mineralization at a number of these targets leads us to believe that we may be in the upper portions of the system and that deeper drilling is required. We plan to commence this drilling in May 2011."

Sobresaliente (Uruguay)

The Sobresaliente project is located 5 km North of the San Gregorio Operation and comprises four discrete orebodies: North, Central, South and East. The mineralization appears to be located at the intersection of two regional structural trends where deformation has produced intense cataclasis and brecciation. Wide zones in excess of 100 m of veined / stock worked granitoids are present and the overall mineralized trend is nearly 1.2 km long.

A combined RC-DD drilling program commenced on 1 December 2010 to infill known mineralization, test along-strike extensions of the known ore bodies, test for the possibility of a bulk tonnage-low grade operation, improve the category of the resource and locally check the geologic and structural model. A total of 6,800 meters (42 holes for a total of 4,855 meters of reverse circulation ("RC") drilling and 20 holes for a total of 1,945 meters of diamond drilling ("DD") had been proposed. As of 10 February 2011, 2,295 meters of RC drilling (31 holes) and 1,219.85 meters of DD (14 of 20 holes) have been completed.

Gold results have been completely reported for reverse circulation drill holes and partially for diamond drill holes. In general, values have confirmed existing grades in the main ore bodies. Significant additional mineralization corresponding to narrow ore shoots is being intercepted on the north and northwest extension (~100m along-strike) of the Central Zone. A significant intercept, that finished in mineralization, of 23 meters at 1.64 g/t Au from 157 meters has also been reported down dip on the eastern zone.

Complete gold results reported until 14 February 2011 are presented in the following tables, where the drill holes are sorted by the ore body zones:

Zone		Hole (1)		From (m)		Intercept (m @ g/t)		Notes
Central		SSRC022		75		2 @ 0.62
Central		SSRC023		20		6 @ 1.97		incl. 1m @ 7.50 g/t
Central		SSRC024						No significant results
Central		SSRC025		0		4 @ 1.53		incl. 1m @ 3.64 g/t
Central		SSRC025		6		2 @ 0.63
Central		SSRC025		13		2 @ 0.68
Central		SSRC025		19		6 @ 0.64
Central		SSRC025		33		1 @ 1.07
Central		SSRC025		60		1 @ 2.77
Central		SSRC029		20		2 @ 1.32
Central		SSRC029		28		4 @ 2.90		incl. 1m @ 4.43 g/t
Central		SSRC029		28				incl. 1m @ 4.73 g/t
Central		SSRC029		42		2 @ 1.12
Central		SSRC030		7		2 @ 0.93
Central		SSRC030		25		3 @ 0.54
Central		SSRC030		122		5 @ 0.79
Central		SSRC030		153		5 @ 0.53
Central		SSRC030		169		4 @ 0.68
Central		SSRC031		71		1 @ 1.06
Central		SSRC032		0		1 @ 2.46
Central		SSRC033		29		1 @ 0.80
Central		SSRC034						No significant results
Central		SSRC035		11		7 @ 0.45
Central		SSRC035		61		4 @ 1.90		incl. 1m @ 4.05 g/t
Central		SSRC035		122		4 @ 2.74		incl. 2m @ 4.53 g/t
Central		SSRC035		132		2 @ 0.52
Central		SSRC035		149		1 @ 3.29
Central		SSRC039		27		2 @ 0.64
Central		SSRC039		47		1 @ 1.37
Central		SSRC039		66		4 @ 3.52		incl. 2m @ 6.55 g/t
Central		SSRC039		84		5 @ 14.80		incl. 1m @ 6.87 g/t
Central		SSRC039		84				incl. 1m @ 64.29 g/t
Central		SSRC039		129		2 @ 2.08		incl. 1m @ 3.43 g/t
Central		SSRC040		61		2 @ 4.22
Central		SSRC041		43		1 @ 0.69
Central		SSRC042		22		2 @ 1.38
Central		SSRC042		35		6 @ 4.19		incl. 1m @ 21.73 g/t
Central		SSRC042		46		1 @ 2.27
Central		SSRC043		41		1 @ 0.98
Central		SSRC043		44		2 @ 1.32
Central		SSRC044		0		1 @ 2.35
Central		SSRC044		10		3 @ 0.82
Central		SSRC044		28		2 @ 0.57
East		SSRC016		33		2 @ 1.28
East		SSRC016		40		3 @ 0.57
East		SSRC016		59		4 @ 1.92		incl. 1m @ 3.86 g/t
East		SSRC017		23		3 @ 0.83
East		SSRC017		36		4 @ 1.19
East		SSRC019		50		1 @ 1.82
East		SSRC045		4		3 @ 1.44
East		SSRC045		157		23 @ 1.64		incl. 1m @ 4.02 g/t
East		SSRC045		157				incl. 1m @ 3.34 g/t
East		SSRC045		157				incl. 1m @ 4.08 g/t
North		SSRC018						No significant results
North		SSRC020		3		1 @ 1.29
North		SSRC020		7		1 @ 1.61
North		SSRC021						No significant results
North		SSRC036		131		3 @ 0.72
North		SSRC037		49		3 @ 0.92
North		SSRC037		121		4 @ 0.82
North		SSRC037		128		2 @ 0.49
North		SSRC037		132		7 @ 0.88
North		SSRC037		141		2 @ 0.65
North		SSRC038		86		3 @ 0.48
North		SSRC038		102		1 @ 0.90
North		SSRC038		111		3 @ 2.49		incl. 1m @ 4.42 g/t
North		SSRC046		75		3 @ 0.55
North		SSRC046		86		4 @ 0.45
North		SSRC046		140		1 @ 2.93
South		SSRC026		21		1 @ 3.06
South		SSRC027		7		1 @ 1.06
South		SSRC027		21		4 @ 1.92		incl. 1m @ 5.20 g/t
South		SSRC027		27		1 @ 2.13
South		SSRC027		34		5 @ 0.62
South		SSRC028						No significant results
Central		SSDD007		0		12 @ 2.76		incl. 4m @ 6.90 g/t
Central		SSDD007		17		3.65 @ 1.74		incl 0.5m @ 9.00 g/t
Central		SSDD007		24		1.30 @ 0.84
Central		SSDD017		19		6.1 @ 0.56
Central		SSDD018		16,2		2.4 @ 2.07
Central		SSDD018		21,8		7.7 @ 0.55
Central		SSDD018		79,2		1.7 @ 2.01
Central		SSDD019		28		7.3 @ 0.63
Central		SSDD019		38,25		7.5 @ 2.10		incl 0.75m @ 4.19 g/t
Central		SSDD019		38,25				incl 1m @ 7.33 g/t
Central		SSDD019		57		2 @ 0.55
Central		SSDD019		71,8		3.9 @ 0.63
East		SSDD012		33,1		1.6 @ 0.98
East		SSDD012		37,3		2.6 @ 1.58
East		SSDD012		41,7		5 @ 0.90
East		SSDD012		75,7		4.9 @ 0.51
North		SSDD009		9		7 @ 0.63
North		SSDD010		28		6.4 @ 0.97
North		SSDD010		54,9		2.50 @ 1.05
North		SSDD010		81,45		2.00 @ 0.58
North		SSDD011		26,4		1.6 @ 1.76
North		SSDD011		51,3		0.9 @ 1.27
North		SSDD011		59,2		5.6 @ 0.48
North		SSDD013		103,4		3.3 @ 0.57
North		SSDD014						Results pending
South		SSDD008		52,25		1.60 @ 0.53
South		SSDD008		77		2 @ 0.97
South		SSDD008		81		4.50 @ 2.05		incl 0.5m @ 14.76 g/t
South		SSDD015						Results pending
South		SSDD016						Results pending
Notes Weighted intercept grades were calculated using an external cutoff of 0.4g/t Au and up to 2 meters of internal dilution is reported. Samples were processed using OMI's in house laboratory using fire assay with atomic absorption finish. For quality control purposes 5% of samples are re-analyzed at external laboratories.

The best intercepts reported correspond mainly to the Central Zone (5m at 14.8 g/t including 1m at 64.29g/t) and East Zone (23m at 1.64 g/t). The drilling program will continue during February. The objective is to produce a new resource estimation that is NI43-101 compliant by Mid 2011.

Anillo (Chile)

OMI completed a first pass drill campaign of 16 reverse circulation drill holes for a total of 2,497 meters at the Anillo project. The drilling targeted anomalous geochemistry in rock and trench sampling combined with magnetic and VLF anomalies from geophysical surveys completed in October 2010.

Anomalous Ag and Au values (maximum 0.37 ppm for Au and 6 ppm for Ag) were intercepted over several meters in holes drilled in two different sectors located to the north and east of Yamana's neighboring Pampa Victoria discovery. Drilling confirms the presence of high level, low temperature epithermal mineralization at shallow depths below surface.

The Company is planning a follow up drill campaign including several deep holes (up to 500m depth) drilled in fences to test for mineralized N/S oriented structures. This decision is based on the knowledge that epithermal orebodies in the district are characteristically deep and often blind with only weak surface manifestations.

Two new sectors (central and west) at the Anillo project are currently being mapped in detail, and high density surface geochemistry is underway. Ground magnetic surveys also continue. The company hopes to generate new targets for first pass drilling in combination with the drilling mentioned above, during May 2011

Pantanillo (Chile)

OMI commenced a planned 6,500 meter summer drilling program at the Pantanillo project in early February 2011.

The first 1000m of (RC) drilling will test for additional oxide resources on the Pantanillo Sur target and will be followed by some 5,000m of reverse circulation and diamond drilling at Pantanillo Norte in late February pending the approval of the DIA which is expected by mid February.

Drilling at Pantanillo Norte will focus on enlarging as well as upgrading the current NI43-101 compliant measured and indicated oxide resource of 1.05M ounces (Sept, 2010). Also, the Company plans to drill several deep diamond holes at Pantanillo Norte to further investigate and better define the underlying sulfide resource and obtain material for metallurgical and geomechanical tests.

Vaca Muerta (Uruguay)

OMI completed a 2,736 meter drill program in December 2010 at the Vaca Muerta project located approximately 85km east (by existing roads) of the San Gregorio plant. Encouraging final assay results where reported in the quarter 2 news release (12 Jan, 2011).

The Company has begun initial metallurgical tests and resource modeling to fast track the project. Additional detailed surface mapping and soil sampling began in January covering the entire Vaca Muerta property. Special attention is being given to the combined 1km strike extensions to the NW and SE of the Vaca Muerta deposit, as well as to the north and south where several reconnaissance geochemical anomalies are known.

Additional drilling planned for March, 2011 will include step-out holes along the Vaca Muerta controlling structure, testing of new geochemical targets and infill drilling to facilitate a measured and indicated NI 43-101 compliant resource estimation.

Other Projects (Uruguay)

OMI continues exploration on several other properties located in southern Uruguay. The Company will start a 1,500 meter infill drill campaign at Crucera in February 2011 and complete a measured and indicated NI43-101 resource estimate by the end of fiscal 2011. First pass exploration drilling has also been planned for the Rocha and Texas projects in southern Uruguay. Some 2,000-2,500 meters has been dedicated to each project and drilling will begin in April 2011.

Qualified Person's Statement

The information presented in this press release has been reviewed by William F. Lindqvist, a director of OMI. Dr. Lindqvist holds a Ph.D. in Applied Geology from Imperial College, London, has been a member of the AusIMM for 46 years, and has had 40 years of experience in international minerals exploration and property evaluation.

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 + 598 2601 6354

Ignacio Salazar, CFO + 598 2601 6354; info@orosur.ca

Matrix Corporate Capital LLP (Nominated Adviser & Broker)

Louis Castro, +44 (0) 203 206 7209

Tim Graham, +44 (0) 203 206 7206

Blythe Weigh Communications (Public Relations and Investor Relations)

Tim Blythe: +44 (0) 7816 924626

Ana Ribeiro: +44 (0) 7980 321505

Matthew Neal: +44 (0) 7917 800011

Copyright Business Wire 2011