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Vancouver, British Columbia: Calibre Mining Corp. (TSX-V: CXB) (the “Company” or “Calibre”) is pleased to announce that the National Instrument 43-101 compliant Technical Report and Resource Estimation dated April 11, 2011 (the “Report”) in support of the February 28, 2011 resource announcement for the Cerro Aeropuerto and La Luna gold and silver deposits in North East Nicaragua has been filed under the Company’s profile on the SEDAR website at www.sedar.com. The report was authored by Todd McCracken, P.Geo of Wardrop, a Tetra Tech Company (“Wardrop”), who is independent of the Company and a Qualified Person in accordance with NI 43-101 policy. In the opinion of the report’s author the Cerro Aeropuerto and La Luna deposits host a global inferred resource of 835,000 ounces of gold and 4,288,070 ounces of silver (table 1, 2 and 3). The report’s author recommends US$2,775,000 of expenditures for 19,500 metres of diamond drilling and further exploration of these deposits.

Table 1 Calibre Mining Corp. Global Inferred Resource (using a 0.6 g/t AuEq 1,3 cutoff grade)2

Tonnes and Grade

Total Contained Metal

 

Deposit

Tonnes

Gold

Silver

Au Eq1

Gold

Silver

Gold

Silver

Au Eq1

 

 

(g/t)

(g/t)

(g/t)

(grams)

(grams)

(ounces)

(ounces)

(ounces)

Cerro Aeropuerto

6,052,000

3.64

16.16

3.89

22,013,000

97,805,000

707,750

3,144,500

757,000

La Luna

2,539,000

1.56

14.01

1.78

3,972,000

35,569,000

127,700

1,143,570

146,000

 

 

 

 

 

 

Total

835,450

4,288,070

903,000

1 Au Eq cutoff equivalent calculated using Wardrop’s estimated gold price of US$1058/oz and silver price of US$16.57 per ounce.
2 Mineral resources that are not mineral reserves do not have economic viability
3 Metallurgical recoveries and net smelter returns are assumed to be 100%


Table 2 Cerro Aeropuerto Deposit – Inferred Resource Calculations at different cutoff grades2

Tonnes and Grade

Total Contained Metal

Cutoff grade

Tonnes

Gold

Silver

Au Eq1

Gold

Silver

Gold

Silver

Au Eq1

Au Eq (g/t)1

 

(g/t)

(g/t)

(g/t)

(grams)

(grams)

(ounces)

(ounces)

(ounces)

0.2

6,850,000

3.24

14.69

3.47

22,228,000

100,599,000

714,640

3,234,350

765,290

0.4

6,219,000

3.55

15.95

3.80

22,078,000

99,203,000

709,820

3,189,470

759,780

0.6

6,052,000

3.64

16.16

3.89

22,013,000

97,805,000

707,750

3,144,500

757,000

0.8

5,656,000

3.86

15.95

4.11

21,845,000

90,205,000

702,330

2,900,150

747,750

1.0

5,396,000

4.02

15.93

4.27

21,676,000

85,980,000

696,910

2,764,320

740,210

1 Au Eq cutoff equivalent calculated using Wardrop’s estimated gold price of US$1058/oz and silver price of US$16.57 per ounce.
2 Mineral resources that are not mineral reserves do not have economic viability


Table 3 La Luna Deposit - Inferred Resource Calculations at different cutoff grades2

Tonnes and Grade

Total Contained Metal

Cutoff grade

Tonnes

Gold

Silver

Au Eq1

Gold

Silver

Gold

Silver

Au Eq1

Au Eq (g/t)1

 

(g/t)

(g/t)

(g/t)

(grams)

(grams)

(ounces)

(ounces)

(ounces)

0.2

3,502,000

1.22

11.15

1.40

4,279,000

39,044,000

137,570

1,255,280

157,230

0.4

2,909,000

1.42

12.79

1.62

4,129,000

37,206,000

132,750

1,196,190

151,480

0.6

2,539,000

1.56

14.01

1.78

3,972,000

35,569,000

127,700

1,143,570

145,610

0.8

2,129,000

1.74

15.82

1.99

3,713,000

33,685,000

119,360

1,083,010

136,320

1.0

1,661,000

2.01

19.09

2.31

3,343,000

31,708,000

107,500

1,019,440

123,460

1 Au Eq cutoff equivalent calculated using Wardrop’s estimated gold price of US$1058/oz and silver price of US$16.57 per ounce.
2 Mineral resources that are not mineral reserves do not have economic viability


Qualified Person

Todd McCracken, P.Geo, is a Qualified Person (“QP”) for purposes of NI 43-101. He is responsible for preparing the Report and the Resource Estimate disclosed in the Report. Mr. McCracken is an employee of Wardrop, and independent from the Companies as described in section 1.4 of NI 43-101. He has read and approved the technical disclosure in this press release.

Calibre Mining Corp. is an aggressive TSX Venture Exchange listed company (TSX.V: CXB) that is focused on the acquisition, exploration and development of gold, silver and copper deposits in Central America. Major shareholders of Calibre include Sun Valley Gold and Yamana Gold Inc.

Calibre Mining Corp.

Signed “Robert Brown”

Robert D. Brown, B.Sc., MBA
President and CEO


For further information contact:
Mark Carruthers - Vancouver, Canada
604 681 9944
www.calibremining.com


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.

Cautionary Note Regarding Forward Looking Statements

Safe Harbour Statement under the United States Private Securities Litigation Reform Act of 1995: Except for the statements of historical fact contained herein, the information presented constitutes “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements including but not limited to those with respect to the price of gold, silver or copper, potential mineralization, reserve and resource determination, exploration results, and future plans and objectives of the Company involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievement of Calibre Mining Corp. to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. There can be no assurance that such statements will prove to be accurate as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements.


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