Calibre and B2Gold Initiate Trenching Program on the Minnesota Gold-Copper Project, Borosi Concessions, Nicaragua - Seite 2

Previous channel sampling assay results along the Minnesota trend include: 9.20 metres grading 4.17 g/t Au (MNTR13-002), 7.50 metres grading 3.93 g/t Au (MNTR13-001), 6.40 metres grading 5.56 g/t Au (BRTR11-044), 8.00 metres grading 6.35 g/t Au (BRTR11-047), 12.80 metres grading 1.27 g/t Au (BRTR11-057), 6.00 metres grading 2.12 g/t Au (BRTR11-054), and 4.65 metres grading 1.51 g/t Au (BRTR11-053).

The Minnesota target area consists of a favourable multi-phase intrusive centre with peripheral epithermal vein sets and widespread alteration. The target is defined by a strong 1.75 kilometre x 1.25 kilometre gold and copper soil anomaly and has considerable gold endowment as indicted by the abundant small-scale artisanal gold miners that are active in the Minnesota region.

The Minnesota gold-copper project is located 20 kilometres northwest of the Primavera gold-copper project where a B2Gold/Calibre drill program intersected significant porphyry-style gold-copper mineralization including: 261.70 metres grading 0.78 g/t Au, 0.30% Cu (PR-11-002) and 172.35 metres grading 0.48 g/t Au and 0.24% Cu (PR-12-008). The Minnesota area was selected as a high priority target during regional evaluation of the entire Borosi Joint Venture area.

Updated maps detailing the result of the current exploration program at the Minnesota Gold/Copper Project will be posted on the Company's web site at www.calibremining.com.

Quality assurance and quality control procedures include the systematic insertion of blanks, standards and duplicates into the rock and soil sample strings. Samples are placed in sealed bags and shipped directly to Acme Labs in Managua, Nicaragua for sample preparation and then to Acme Labs in Vancouver, Canada for gold fire assay and ICP-MS multi element analyses. The technical content in this news release was read and approved by Gregory Smith, P.Geo, President and CEO of the Company who is the Qualified Person as defined by NI 43-101.

About Calibre Mining Corp.

Calibre controls a 100% interest in 429 km² of mineral concessions and additionally, Calibre has joint venture exploration programs underway with B2Gold Corp. on 322.3 km² of concessions which include the Primavera gold-copper porphyry discovery and Alder Resources Ltd. on the 33.6 km² Rosita gold-copper-silver project. Major shareholders of Calibre include gold producer B2Gold Corp.

Calibre Mining Corp.

Greg Smith, P.Geo., President and CEO

Neither the 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.

Calibre Mining Corp.
Ryan King
604 628-1012
www.calibremining.com