Monday, December 5, 2011

Calibre Announces Start of 5,000 Metre Drill Program at Rosita Copper-Gold-Silver Project, Nicaragua

VANCOUVER, BRITISH COLUMBIA-(Marketwire - Dec. 5, 2011) - Douglas Forster, Chairman of Calibre Mining Corp. (TSX VENTURE:CXB) (the "Company" or "Calibre") is very happy to announce that Alder Resources Ltd. ("Alder") (TSX VENTURE:ALR) has informed Calibre that drilling has commenced on Calibre's Rosita Copper- Gold-Silver Project around the Company's Borosi Property in northeastern Nicaragua. The main program will incorporate 1,000 metres of reverse circulation ("RC") drilling to follow-up on historic mineralized diamond drill intercepts below the Santa Rita pit. Alder will also drill test the historic dumps about the Santa Rita pit. Additional RC drilling as much as 4,000 metres will test mineralization in other highly prospective areas like R-13 zone and the Bambana porphyry copper target and various other targets generated while in the ongoing exploration program.



Alder is earning a 65%
fascination with the 3,356 ha Rosita D Concession by issuing Calibre 1,000,000 Alder shares and spending $4,000,000 on exploration spanning a 4 (four) year period (see Calibre News Release dated August 22, 2011). Alder is a project operator.



The Rosita D Concession hosts the historic open pit Santa Rita copper-gold-silver deposit
from where 5.37 million tonnes of ore grading 2.06% Cu, 0.93 g/t Au, and 15.08 g/t Ag was extracted. The mine closed in 1975 resulting from low copper prices. Alder has competed detailed vertical channel sampling round the periphery of the old mine dumps close to the Santa Rita pit and possesses begun trenching within the Bambana area. The Bambana prospect located four kilometres northwest with the Santa Rita open pit was drill tested by Calibre last year and returned drill intercepts including: 0.43% Cu over 42 metres and 0.51% Cu, 0.25 g/t Au and 10.41 g/t Ag over 11.5 metres (see Calibre News Release dated August 19, 2010).



Douglas Forster, Chairman of Calibre stated: "Calibre is
pleased to have 3 (three) drill rigs active on our 860 km2 Borosi Gold-Copper-Silver Property from the historic "Mining Triangle" of northeastern Nicaragua. Beyond just the Alder RC drill program over the Rosita Copper-Gold-Silver Project Calibre has the benefit of one diamond drill participating in the Primavera Gold-Copper Project along with B2Gold Corp. and one diamond drill performing a resource delineation drill program on Calibre's 100% owned Risco de Oro Gold-Silver Project."



The technical content
in such a news release was read and approved by Gregory Smith, P.Geo, Vice chairman, Exploration plus a Qualified Person ("QP") as defined by NI 43-101.



About Calibre Mining Corp.



Calibre Mining Corp.
can be a, TSX Venture Exchange listed company (TSX VENTURE:CXB) that could be focused on buying, exploration and expansion of gold and silver deposits in Mexico. The Company is dependant on a resource delineation drill program at its 100% owned Riscos de Oro gold-silver project and the diamond drilling program on the Primavera gold-copper prospect with B2Gold Corp. Major shareholders of Calibre include gold producer Yamana Gold Inc. and investment fund Sun Valley Gold.



CALIBRE MINING CORP.



Douglas Forster, M.Sc., P.Geo., Chairman



Cautionary Note Regarding Forward Looking Statements



Safe Harbour Statement
in the United States Private Securities Litigation Reform Act of 1995: Except for the statements of historical fact contained herein, the knowledge presented constitutes "forward-looking statements" in the meaning of the individual Securities Litigation Reform Act of 1995. Such forward-looking statements including however, not limited to those that have respect into the price of gold, silver or copper, potential mineralization, reserve and resource determination, exploration results, and future plans and objectives from the Company involve known and unknown risks, uncertainties along with other factors that may cause the actual results, performance or achievement of Calibre Mining Corp. for being 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 make accurate as actual results and future events could differ materially from those anticipated in these statements. Accordingly, readers shouldn't place undue attachment to forward-looking statements.



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 any adequacy or accuracy with this release.
[
Trituradora de piedra Trituradora de quijada trituradora de cono]

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