The first ten drill holes of 2018 intersect gold mineralization at Cheechoo

TSX-V: SOI June 6, 2018

The first ten drill holes of 2018 intersect gold mineralization at

Cheechoo

MONTREAL, QUEBEC Management of SIRIOS (TSX-V: SOI) is pleased to announce

assays results for a series of ten recently completed drill holes (#141 to 150) on the

Cheechoo gold property at Eeyou Istchee James Bay, Quebec. These drill holes confirm

the extension of the gold mineralization at the tonalite -metasediments contact, both to the

north-west with drill hole #145 that intersected 0.7 g/t Au over 80.5 m, as well as to the

south-east of the central area with drill hole #146 that yielded 1.0 g/t Au over 66.0 m.

These two drill holes are located a distance of 950 metres from each other. The analytical

results of these recent drill holes confirm the interpretation of the known mineralized

envelope, that extend s for more than one kilometre along the tonalite -metasediments

contact. In addition, drill hole #142 completed a vertical section through the broad gold

envelope, with gold grades averaging between 0.6 and 0.9 g/t Au.

Dominique Doucet, President of Sirios, states: "The results from recent drill holes allow us

to progress rapidly in our understanding and modelling of the Cheechoo gold

mineralization. We are all very encouraged and enthusiastic when the results allow us to

develop a section such as drill holes #140, 142 and 98. We can see on this section consistent

gold grades over an impressive area."

The NQ drill holes #141 to 150 total led 2,829 metres. Significant assay results for these

drill holes are detailed in the table below. Assay results are pending for 48 additional drill

holes (#151 to 198) completed on Cheechoo in 2018.

SIGNIFICANT ASSAY RESULTS

PROJECT CHEECHOO – WINTER 2018

SOUTH-EAST EXTENSION AREA

Drill

hole From To Length* Au (g/t)

CH18-

142

97.4 105.8 8.4 0.9

187.0 264.5 77.5 0.8

incl. 216.6 217.4 0.8 16.5

304.0 311.0 7.0 4.0

incl. 305.0 305.8 0.8 27.6

144 59.0 177.1 118.1 0.6

incl. 67.0 67.8 0.8 22.7

incl. 159.3 160.1 0.8 27.9

351.0 352.0 1.0 23.4

72.0 138.0 66.0 1.0

incl. 72.0 102.1 30.1 1.7

146 incl. 97.2 98.0 0.8 38.1

122.4 138.0 15.6 0.7

149 69.0 81.0 12.0 0.5

*Interval along the hole, True width unknown

NORTH-WEST EXTENSION AREA

Drill

hole From To Length* Au (g/t)

CH18-

141 28.0 61.5 33.5 0.4

132.5 144.5 12.0 0.7

143 5.6 31.3 25.7 0.5

145 116.0 196.5 80.5 0.7

147 14.6 44.5 29.9 0.4

148

20.6 30.0 9.4 0.5

102.0 122.5 20.5 0.5

164.0 175.2 11.2 1.3

150 40.5 51.1 10.6 0.6

71.0 78.5 7.5 0.7

*Interval along the hole, True width unknown

Note that the composites presented on the drill sections were recalculated while taking in

consideration the limits of the gold envelope and may differ from composites previously

published, such as drill hole CH17-98 with 0.9 g/t Au over 246.7 m.

The 2018 drilling campaign, with 58 drill holes totalling 15,720 metres, was finished on

May 21st with the completion of drill hole #198. The systematic coverage of the central

gold area, measuring approximately 500 metres by 500 metres , was completed at a drill

spacing of 50 metres.

A table of collar coordinates is available at the following link:

http://sirios.com/files/BD-Coordinates-Drilled-20180606.pdf

Sirios’s 100% owned Cheechoo property is located at Eeyou Istchee James Bay, Quebec,

approximately 800 km north of Montreal, 200 km east of Wemindji and less than 10 km from

Goldcorp’s Éléonore gold mine.

Assay quality control

All NQ drill core was described by Sirios personnel at the Cheechoo exploration camp. The drill

core was then sent to Rouyn- Noranda to be sawed in half, with one half sent to a commercial

laboratory for assaying and other half retained for future reference. A strict QA/QC program was

followed by integrating blanks and certified reference standards to the core sample sequence. The

samples were assayed for gold by fire assay with an atomic absorption finish by Actlabs in Ste -

Germaine-Boulé. Samples assaying more than 2 g/t, as well as drill core samples with visible gold,

were assayed by fire assay with metallic sieve based on a 1 kg sample.

Jordi Turcotte, MSc., Geo., and Nicole Gauthier, MSc., Geo , Qualified Person s pursuant to

National Instrument 43- 101, have prepared and verified the technical information of this press

release, as well as reviewing the final text.

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

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For more information, contact:

Dominique Doucet, Eng., President, CEO [email protected]

Nicole Gauthier, Exploration Manager, [email protected]

Tel.: (514) 510-7961