Calibre Mining Corp. announced the start of the first two drilling programs of 2017 on the Borosi Concession, Northeast Nicaragua. The first drilling program is at the Eastern Borosi Project, which is being funded by Calibre's partner IAMGOLD Corporation and the second program is on the 100% Calibre owned Monte Carmelo Gold Skarn Project. Exploration to date on the Eastern Borosi Project has outlined several tens of kilometres of highly prospective gold-silver mineralized structures located in an historic mining district. Targets have been defined by surface soil and rock sampling, trenching and drilling. In 2014-2015-2016 over 18,600 metres in 116 drill holes were completed resulting in several high grade gold-silver discoveries including; Guapinol, Vancouver, Main Blag, East Dome, Santos Trend, La Sorpresa and Riscos de Oro extension. Previous drilling by Calibre on Riscos de Oro consisted of 9,494 metres in 37 drill holes. Exploration and drilling has been highly successful in discovering and defining high-grade, gold-silver mineralization on the Eastern Borosi Project where all zones remain open and with numerous additional targets yet to be tested. Drilling in 2017 will focus on step out drill holes which will test down plunge and on-strike extensions, with holes designed to expand open high-grade intercepts at Riscos de Oro, Guapinol, Main Blag, and East Dome. Calibre and IAMGOLD entered into an option agreement dated May 26, 2014 whereby IAMGOLD can earn a 51% interest in the Project consisting of 176 km2 within the Borosi Concessions, Northeast Nicaragua, by incurring USD 5 million in exploration expenditures and making USD 450,000 in payments to Calibre by May 26, 2017. The total potential investment by IAMGOLD to earn a 70% interest in the Project is USD 10.9 million. The Project hosts NI 43- 101 inferred gold-silver resources in two deposits and a series of well-defined low sulphidation epithermal gold-silver targets. 100% Owned Monte Carmelo Gold Skarn 2017 Drilling Program The maiden drilling program at the 100% owned Monte Carmelo Gold Skarn Project has begun. The program will consist of a minimum of 2,500 metres of diamond drilling targeting high-grade gold skarn mineralization exposed on surface and tested by an extensive program of auger drilling. On the Monte Carmelo Gold Project, which is located north of the town of Rosita, geological mapping and geochemical sampling has outlined skarn and structurally-related gold mineralization. The overall size of the main skarn body is greater than 700 m long and 200-300 - m wide. Additional exploration consisting of auger sampling of the mineralized zone along NE orientated Line TR1 located in the upper part of the hill, returned - an average of 105 metres grading 5.47 g/t Au. In the same area in the western part of NW orientated Line NW1 the average is 47 metres grading 3.82 g/t Au. The mineralized zone along Line TR2 returned 25 metres grading 1.38 g/t Au. Note the average grades are the arithmetic averages of the auger rock samples along the lines. Calibre is committed to best practice standards for all exploration, sampling and drilling activities. Drilling is being completed by independent firm Kluane Drilling Ltd. Analytical quality assurance and quality control procedures include the systematic insertion of blanks, standards and duplicates into the 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 50 gram gold fire assay and ICP- MS multi element analyses.