IAMGOLD JV - Eastern Borosi Project

IAMGOLD has completed the First Option having paid $450,000 and completed expenditures of $5 million and has earned 51% interest in the Eastern Borosi Projects. 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. IAMGOLD has exercised the Second Option with the right to earn a further 19% in the Project (by paying $450,000 and further exploration expenditures of $5 million) having paid the first installment of $150,000 and completed a 2017 drilling program. The total potential investment by IAMGOLD to earn a 70% interest in the Project is US$10.9 million.

Exploration to date on the Eastern Borosi Project has outlined several tens of kilometres of highly prospective mineralized structures located in an historic gold-silver mining district. Targets have been defined by surface soil and rock sampling, trenching and drilling.

To date in 2017, Total holes completed to date: 16 (5 Guapinol, 3 RDO, 5 East Dome, 3 Main Blag) and total meterage to date 5,159.56m (1,427.92m Guapinol, 1,352.67m RDO, 1,334.35m East Dome, 1,044.62 Main Blag). Results have been received and are being reported in this news release for the first 14 holes. Drilling in 2017 is targeting a series of high grade gold-silver vein systems defined by historic drilling and drilling campaigns in 2014, 2015, and 2016. Step out drill holes are testing down plunge and on-strike extensions. Low sulphidation epithermal gold-silver mineralization intersected on the Eastern Borosi Project is hosted within porphyritic andesite and consists of structurally controlled, high energy quartz-carbonate vein breccias, vein-stockworks and discrete smokey quartz veins containing fine grained sulphide minerals.

Drilling at East Dome has extended the mineralization 100 metres to the south. The step out drilling intersected 8.0 metres grading 11.7 g/t silver (BL17-050), 10.72 metres grading 0.24 g/t gold and 57.3 g/t silver including 1.22 metres grading 1.36 g/t gold and 135.0 g/t silver and a second intercept of 9.86 metres grading 0.06 g/t gold and 31.4 g/t silver (BL17-051), 8.00 metres grading 1.57 g/t gold and 38.3 g/t silver including 1.78 metres grading 5.69 g/t gold and 71.1 g/t silver (BL17-052), 4.48 metres grading 0.83 g/t gold and 42.1 g/t silver and a second zone of 3.33 metres grading 0.03 g/t gold and 65.4 g/t silver (BL17-053), and 9.62 metres grading 0.70 g/t gold and 60.5 g/t silver including 1.30 metres grading 3.78 g/t gold and 208.0 g/t silver (BL17-054). Additional step out drilling will be completed on the East Dome target.

One kilometer west drilling on the Main Blag Gold-Silver Vein System has extended the mineralization 50 metres to the south testing the structure in that area to a depth of 325 metres below surface. The mineralized interval of 5.87 metres grades 0.12 g/t gold and 4.5 g/t silver (BL17-055), drill hole BL17-056 intersected the mineralization approximately 350 metres below surface with results pending. Drill hole BL17-057 was lost in a strong fault zone consisting of tectonic breccia and fault gouge.

Five holes tested the extensions of the Guapinol mineralization. Drill hole GP17-047 intersected 2.95 metres grading 0.45 g/t gold and 1.1 g/t silver. Hole GP17-048 intersected historic underground workings but no mineralized structure, while GP17-049 included 1.3 metres grading 1.02 g/t gold and 6.3 g/t silver, GP17-050 intersected 2.15 metres grading 0.39 g/t gold and 1.8 g/t silver, and GP17-051 included 7.2 metres grading 0.21 g/t gold and 1.4 g/t silver.

Drilling on the Riscos de Oro (RDO) Structure, the first drilling at RDO since 2011, has intersected 4.52 metres grading 1.02 g/t gold and 5.5 g/t silver with a second zone of 1.09 metres grading 1.34 g/t gold and 3.2 g/t silver (RD17-045), 4.78 metres grading 0.25 g/t gold and 2.3 g/t silver (RD17-044), and 3.00 metres grading 0.35 g/t gold and 1.7 g/t silver (RD17-043). Additional drilling is on-going testing step-outs on the RDO structure.

IAMGOLD FIRST OPTION 2014 – 2017 Drill Hole Highlights

Hole IDTargetAu g/tAg g/tLength (m)From mTo m
BL15-011Main Blag3.08381.310.7421.8632.60
BL15-017East Dome1.11223.419.16120.50139.66
BL15-009Main Blag5.36194.69.92135.33145.25
BL15-010Main Blag2.52246.412.8264.3877.20
BL15-018East Dome0.69488.69.4491.44100.88
BL16-044East Dome2.27127.916.50194.00210.50
GP16-046Veta Loca10.156.96.3188.0094.31
BL16-038Main Blag11.1313.75.61179.82185.43
BL16-044East Dome9.64404.43.38206.17209.55
BL14-005Main Blag2.18133.812.4777.4589.92
BL16-043East Dome1.21120.915.3597.65113.00
BL15-006Main Blag5.9756.15.85149.83155.68
BL15-023Santos Trend5.744.86.4460.9667.40
BL16-048East Dome0.8473.513.7297.00110.72
BL16-043East Dome3.61348.73.00110.00113.00
BL16-040East Dome2.69431.62.78162.84165.62
BL17-058East Dome0.38328.34.05296.00300.05
BL16-046Main Blag1.577.812.10271.45283.55
BL17-060East Dome2.7442.56.00315.67321.67

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