Drilling Report

Drilling Report

Orosur Mining Inc.

Orosur Mining Inc.

Completion of Drilling Program and Further Drill Results for Pantanillo

Orosur Mining Inc. (“OMI” or “the Company”), today announced further drill results for Pantanillo. The drill program of 30 diamond and RC drill holes for 5,637 meters has now been completed.

David Fowler, Chief Executive Officer commented: “Orosur is well on its way to defining a NI 43-101 compliant resource at Pantanillo. All of the 24 drill holes received to date were mineralized and the deposit remains open at depth. The recent drilling program at Pantanillo targeted the oxidized portion of the deposit and a scoping study is underway. Assays from the remaining 7 holes of the initial program are expected during May. No further drilling could be completed this summer season.”

“Additionally, exploration work has commenced at the Anillo project in Northern Chile which sits north east of the El Peñon Mine. A regional, first pass mapping program has already been completed and a surface geochemical sampling program is ready to commence. In summary, I am very pleased with the rapid progress that our Chilean Exploration team has made”.

Pantanillo

The Pantanillo property is optioned from Anglo American Norte S.A., a subsidiary of Anglo American PLC. The project is located in the Maricunga Belt of Chile, approximately 30 km north of the Maricunga Mine operated by Kinross Gold Inc. Drilling has been focused on the Pantanillo Norte target.

Preliminary results for the first 9 holes of the program were reported on April 15^t, 2010. Complete results for the first 24 holes are reported in the table below. Results are reported with a 0.3g/t Au cut off grade and may include zones up to 4m of internal dilution by lower grade material. Copper values for the same intervals are also reported as Cu%. Samples were analyzed by ACME Labs in Santiago, Chile and a comprehensive internal QAQC program supports the validity of all reported results.

New Results

Drill Hole	Â	Au Intercept (0.3g/t)0.3g/t)	Â	Cu (%)	Â	From
PNN-10-11RC		25m @ 0.64g/t		0.016		14
PNN-10-11RC		includes
PNN-10-11RC		1m @ 5.68g/t		0.013		37
PNN-10-11RC		4m @ 0.74g/t		0.015		195
PNN-10-12DDH		32m @ 0.51g/t		0.023		124
PNN-10-13DDH		12m @ 0.53g/t		0.034		58
PNN-10-13DDH		38m @ 0.36g/t		0.038		82
PNN-10-14RC		54m @ 0.68g/t		0.020		47
PNN-10-14RC		includes
PNN-10-14RC		5m @ 1.27g/t		0.036		60
PNN-10-14RC		15m @ 0.66g/t		0.051		111
PNN-10-14RC		6m @ 0.43g/t		0.028		151
PNN-10-15DDH		20m @ 1.32g/t		0.003		0
PNN-10-15DDH		41m @ 1.50g/t		0.050		180
PNN-10-16RC		10m @ 0.43g/t		0.004		61
PNN-10-16RC		21m @ 0.52g/t		0.007		77
PNN-10-16RC		4m @ 0.50g/t		0.010		103
PNN-10-16RC		21m @ 0.43g/t		0.039		179
PNN-10-17RC		58m @ 1.11g/t		0.025		119
PNN-10-17RC		includes
PNN-10-17RC		11m @ 2.06g/t		0.015		144
PNN-10-17RC		15m @ 0.47g/t		0.012		235
PNN-10-18RC		6m @ 0.91g/t		0.005		59
PNN-10-18RC		64m @ 0.99g/t		0.016		69
PNN-10-18RC		includes
PNN-10-18RC		20m @ 1.85g/t		0.021		97
PNN-10-18RC		51m @ 0.61g/t		0.022		149
PNN-10-18RC		includes
PNN-10-18RC		6m @ 1.17g/t		0.018		190
PNN-10-19RC		20m @ 1.59g/t		0.016		2
PNN-10-19RC		70 @ 0.92g/t		0.046		44
PNN-10-19RC		includes
PNN-10-19RC		7m @ 2.24g/t		0.071		75
PNN-10-20RC		29m @ 0.94g/t		0.011		3
PNN-10-20RC		includes
PNN-10-20RC		5m @ 2.16g/t		0.009		15
PNN-10-20RC		11m @ 0.74g/t		0.010		38
PNN-10-21DDH		30.5m @ 1.00g/t		0.041		188
PNN-10-22DDH		8m @ 0.47g/t		0.009		22
PNN-10-22DDH		28m @ 1.17g/t		0.066		78
PNN-10-22DDH		15.1m @ 0.59g/t		0.051		160
PNN-10-23RC		2m @ 0.78g/t		0.008		3
PNN-10-23RC		10m @ 0.38g/t		0.005		10
PNN-10-23RC		26m @ 0.50g/t		0.035		51
PNN-10-23RC		8m @ 0.40g/t		0.039		93
PNN-10-23RC		13m @ 0.44g/t		0.052		113
PNN-10-23RC		9m @ 0.36g/t		0.03		128
PNN-10-24RC		14m @ 0.47g/t		0.039		35
PNN-10-24RC		14m @ 0.64g/t		0.034		62
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Previously reported results

Drill Hole	Â	Au Intercept (0.3g/t)0.3g/t)	Â	Cu (%)	Â	From
PNN-10-01DDH		12m @ 1.41g/t		0.036		60
PNN-10-01DDH		71.4 @ 0.94g/t		0.016		130
PNN-10-02DDH		54m @ 0.53g/t		0.015		108
PNN-10-02DDH		12m @ 0.32g/t		0.011		180
PNN-10-02DDH		38m @ 0.77g/t		0.024		202
PNN-10-03DDH		66m @ 0.93g/t		0.028		26
PNN-10-03DDH		55.9m @ 0.79g/t		0.044		140
PNN-10-04DDH		4m @ 0.65g/t		0.030		76
PNN-10-04DDH		4m @ 0.56g/t		0.030		90
PNN-10-04DDH		74m @ 1.36g/t		0.018		150
PNN-10-04DDH		includes
PNN-10-04DDH		16m @ 3.53g/t		0.010		204
PNN-10-04DDH		27.5m @ 0.99g/t		0.021		230
PNN-10-05DDH		6m @ 1.00g/t		0.004		48
PNN-10-05DDH		82m @ 0.53g/t		0.032		140
PNN-10-06DDH		72m @ 0.55g/t		0.017		4
PNN-10-06DDH		includes
PNN-10-06DDH		10m @ 1.14g/t				22
PNN-10-06DDH		40m @ 1.37g/t		0.026		82
PNN-10-06DDH		includes
PNN-10-06DDH		16m @ 2.15g/t		0.035		98
PNN-10-06DDH		28m @ 0.52g/t		0.022		140
PNN-10-06DDH		6m @ 0.41g/t		0.019		176
PNN-10-07RC		5m @ 0.34g/t		0.002		52
PNN-10-07RC		37m @ 0.48g/t		0.020		130
PNN-10-07RC		5m @ 0.42g/t		0.016		182
PNN-10-07RC		4m @ 0.62g/t		0.009		195
PNN-10-08DDH		58m @ 0.57g/t		0.031		42
PNN-10-08DDH		12m @ 0.47g/t		0.020		152
PNN-10-09DDH		8m @ 2.23g/t		0.053		124
PNN-10-10DDH		8m @ 0.93g/t		0.005		22
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The drilling program at Pantanillo included 19 diamond drill holes for 3,785 meters and 11 RC holes for 1,853 meters. Drill holes were spaced along 100m NE oriented section lines with drill collar spacing also at 100m. Including the historic drilling the resource is now defined by an approximately 50m by 50m spaced drill grid. Drill holes were angled at -60 to -80 degrees towards the NE and an effort was made to stagger RC with diamond drilling. Diamond drilling was completed with oriented core. Individual sample lengths averaged 2 meters for diamond and 1 meter for RC.

Anillo

The Anillo property is optioned from the Chilean state owned mining company, Codelco. The property is located north northeast of the El Peñon mine operated by Yamana Gold Inc. Orosur has commenced an exploration program targeting high grade vein mineralization similar to that being mined at El Peñon. The Pampa Victoria discovery recently made by Yamana is approximately 5 km to the west and south of key targets identified by OMI. A 1:10000 scale regional geological mapping began in March 2010 and focused on higher priority target areas established by OMI. A detailed surface geochemical sampling program including stream sediments and rock chips will begin in the second half of May. Trenching on a number of targets will commence in June with drilling expected to follow later in calendar 2010.

Qualified Person's Statement
The information presented in this press release has been reviewed by Devin den Boer, PGeo, OMI Exploration Manager and is considered to be in compliance with NI 43-101 reporting guidelines. Mr. den Boer has a Bachelor of Science (Geological Sciences) Degree from the University of British Columbia, is a registered member of APEGBC and has over 13 years of international experience in minerals exploration. The information presented in this press release has been reviewed by Devin den Boer, PGeo, OMI Exploration Manager and is considered to be in compliance with NI 43-101 reporting guidelines. Mr. den Boer has a Bachelor of Science (Geological Sciences) Degree from the University of British Columbia, is a registered member of APEGBC and has over 13 years of international experience in minerals exploration.

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. 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.

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.

ENDS

About Orosur Mining Inc.
Orosur Mining Inc. is a fully integrated gold production 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). Orosur Mining Inc. is a fully integrated gold production 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:

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Orosur Mining Inc

David Fowler, CEO:

Ignacio Salazar, CFO + 598 2 6016354; [e-mail]

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Matrix Corporate Capital LLP (Nominated Adviser & Broker)

Louis Castro, [phone]

Tim Graham, [phone]

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In North America

Forbes West 416-203-2200 [e-mail]

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