CXB Calibre Mining Corp

Calibre Mining Corp. (TSX VENTURE:CXB) (the "Company" or "Calibre") is pleased
to provide an update on the Company's exploration activities and recent
discoveries at the 100% owned Riscos de Oro gold-silver deposit and other high
priority targets in the Eastern Epithermal District on the Borosi Concessions,
northeast Nicaragua. Calibre controls a 100% interest in 429 km2 of mineral
concessions in the Mining Triangle of NE Nicaragua. Additionally, Calibre has
joint venture exploration programs underway with Alder Resources Ltd. on the
33.6 km2 Rosita gold-copper-silver project; and with B2Gold Corp. on 322.3 km2
of concessions which includes the Primavera gold-copper porphyry discovery.


Highlights



--  New Discoveries; Calibre continues to outline numerous high priority
    targets along two sub-parallel gold-silver vein trends; the 8.5
    kilometre Riscos de Oro - El Paraiso Trend and the greater than 10km
    Guapinol - La Sorpresa Trend; 
--  Significant trench results have been returned for BTR13-097 on the
    Riscos de Oro vein extension located 500 m north-east of the existing
    gold-silver resource ; 2 veins intersected: 
    --  13.50 m @ 3.26 g/t Au and 14.7 g/t Ag (0.00-13.50m) 
        --  Including 3.00m @ 11.51 g/t Au and 56.6 g/t Ag (6.60-9.60m)
--  Additional soil results returned from the Guapinol-California area;
    evidence for numerous parallel vein sets with cumulative strike length
    of 15.8 km; numerous rock samples containing anomalous Au-Ag values 
--  Mapping and prospecting in the La Sorpresa area identified up to 5 vein
    systems with a cumulative strike length of 5.8 km; rock sampling
    returned up to 42.46 g/t Au and 2457 g/t Ag 
--  The vein-style gold-silver mineralization discovered in Calibre's
    Eastern Epithermal District is geologically similar to mineralization at
    the near-by Bonanza mine which has produced in excess of 2.8 million ozs
    of gold. Mineros SA recently purchased a 90% interest in Hemco Nicaragua
    SA, the private company that owns the Bonanza mine for $95.4 million (El
    Nuevo Diario Newspaper - April 27, 2013)



President and CEO, Greg Smith stated, "Our exploration programs on our 100%
owned Eastern Epithermal District targets continue to be successful in expanding
existing zones and defining new targets in what is emerging as an exciting
high-grade, gold-silver district. The underexplored nature of the district is
confirmed by the recent discovery of high-grade silver mineralization at the La
Sopresa target area that returned 2457 g/t Ag and 1387 g/t Ag from surface rock
samples."


The 100% Calibre owned Eastern Epithermal Gold-Silver District is in the
north-eastern portion of the Borosi Concessions and contains the Riscos de Oro
and La Luna Gold-Silver Deposits. Previous exploration on the Riscos de Oro - El
Paraiso Trend has outlined numerous gold-silver anomalous zones, past producing
pits and shallow shafts and existing small scale mining areas extending over 8
kilometres. On-going exploration on the newly acquired Guapinol - La Sorpresa
Trend has been successful in defining a series of related anomalous gold-silver
vein targets extending over 10 kilometres.


Riscos de Oro - El Paraiso Trend

Calibre continues to advance the Riscos de Oro - El Paraiso trend. Work has
included; 9427.6 m diamond drilling (37 holes), 232 surface rock samples, 382
trench rock samples, 587.7 m trenching (26 trenches), 63.4 line km soil sampling
(2432 samples), as well as reconnaissance geologic mapping over 36 km2.
Significant results include; multiple significant drill intersections by Calibre
including 10.25 g/t Au and 288.25 g/t Ag over 5.40 m in RD11-010; the Riscos de
Oro gold-silver deposit has been confirmed over a 725 m strike length and to a
depth of 300 m and remains open for resource expansion; gold in soil anomaly has
been delineated over a 7 kilometre strike length from the deposit towards the
southwest. Additional work is planned including; trenching of best soil and rock
geochemical anomalies and follow-up diamond drilling program testing the along
strike extension of the system.


Results have been received for a step out trench completed on the Riscos de Oro
trend 500 metres northeast of the existing resource area. The trench returned
13.50 m grading 3.26 g/t Au and 14.7 g/t Ag (including 3.00m @ 11.51 g/t Au and
56.6 g/t Ag) from two epithermal quartz veins. The results from this trench
extend the Riscos de Oro structure 500 metres towards the northeast.


Table 1. Summary of composite results from Riscos trench BTR13-097



---------------------------------------------------------------------------
Prospect        Trench ID  From (m)  To (m)  Interval (m) Au (g/t) Ag (g/t)
---------------------------------------------------------------------------
---------------------------------------------------------------------------
                               0.00   13.50         13.50     3.26     14.7
Riscos de Oro   BTR13-097      5.50   12.00          6.50     5.98     27.4
                               6.60    9.60          3.00    11.51     56.6
---------------------------------------------------------------------------



Guapinol - La Sorpresa Trend 

Calibre continues to define the recently identified Guapinol - La Sorpresa
gold-silver trend. Work completed includes; 199 surface rock samples, 41 line km
soil sampling (2055 samples), and reconnaissance geologic mapping over 27 km2.
Work to date has outlined multiple parallel, northeast oriented gold and silver
bearing quartz vein systems. Surface rock results include 42.5 g/t Au, 2457 g/t
Ag, 4468 ppm Pb and 1513 ppm Zn highlighting the high-grade nature of some
veins. Long lived, small scale artisanal mining in the Guapinol and California
areas confirms consistent gold grades in quartz veins. Planned work includes
trenching of high priority soil and rock geochemical anomalies.


Historic drilling at the Guapinol gold-silver zone consisted of 16 diamond drill
holes testing a single structure along 150 metres of strike length and down to a
depth of approximately 80 vertical metres. Drilling highlights include: G-4;
1.84 m @ 2.33 g/t Au and 276.48 g/t Ag, G-6; 1.52 m @ 28.87 g/t Au and 21.87 g/t
Ag, G-8; 3.10 m @ 13.08 g/t Au and 10.02 g/t Ag, and G-11; 0.5 m @ 32.43 g/t Au
and 103.15 g/t Ag (see News Release Nov. 27, 2012). Mapping, prospecting and
soil sampling completed in 2013 along the Guapinol-La Sorpresa trend
successfully identified up to 7 parallel veins in the immediate Guapinol
prospect area while five new vein systems have been identified in the area of
the La Sorpresa prospect. Other veins have been identified in the El Carmen and
Pueblo Santo areas. Recent soil and rock results have further defined and
extended the multiple parallel epithermal veins encountered in the Guapinol
trend to a cumulative strike length of over 15.8 km. The majority of the veins
occur within three main northeast oriented parallel systems. 


At the La Sorpresa gold-silver target quartz veins have returned the highest
grade surface gold and silver values to date from the entire region. Results
from recent soil samples have defined the vein trends between low hills with
quartz float material and through areas of low topographic relief. Several
significant gold-silver rich rock samples have been returned from the La
Sorpresa prospect including B13R3072 (14.2 g/t Au and 274 g/t Ag) that was
collected from some artisanal workings that can be traced over 400 m. Sample
B12R1057, collected from a sub-parallel vein system further to the west,
returned 42.46 g/t Au and 340 g/t Ag from artisanal workings exposed over a 200
m strike length. Of greatest interest are samples B13R3081 and B13R3082 that
contained 2457 g/t Ag and 1387 g/t Ag respectively. These subcrop rock samples
were collected from a low northeast-southwest oriented hill that has no evidence
of artisanal mining. Soil sampling has been completed around this hill in order
to confirm the orientation of the mineralization and strike length of the system
and results are pending.


Updated maps detailing the result of the current exploration programs will be
posted on the Company's web site at www.calibremining.com. Mr. Gregory Smith,
P.Geo, the President and CEO of the Company, is the Qualified Person as defined
by NI 43-101, and is responsible for the accuracy of the technical data and
information contained in this news release.


About Calibre Mining Corp.

Calibre Mining Corp. is a TSX Venture Exchange listed company (TSX VENTURE:CXB)
that is focused on the acquisition, exploration and development of gold and
silver deposits in Central America. The Company is focused on its 100% owned
Riscos de Oro gold-silver deposit, the drilling program at the Primavera
gold-copper project in conjunction with B2Gold Corp. and the exploration program
on the Rosita copper-gold-silver project in conjunction with Alder Resources
Ltd. Major shareholders of Calibre include gold producer B2Gold and investment
fund Sun Valley Gold.


Calibre Mining Corp.

Greg Smith, P.Geo., President and CEO

FOR FURTHER INFORMATION PLEASE CONTACT: 
Calibre Mining Corp.
Ryan King - Vancouver, Canada
604 628 1012
www.calibremining.com

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