S N Wassa Main Pit BS17DD014A as at Dec 31, 2017 Mother - PowerPoint PPT Presentation

Wassa Underground: Isometric View S N Wassa Main Pit BS17DD014A as at Dec 31, 2017 Mother 19500N 19300N 19100N 18900N hole BS17DD003 BS17DD3 85M BS17DD012 BS17-745-17 BS17-720-29 B Shoot Inferred stopes Mineral Resource Decline as at Dec 31, 2017 4 daughter holes Grade Block 24217DD006 model >1.9 g/t BSDD347 BS17DD315M BSDD351 BS17DD385D2 BS17DD385D4 BS17DD308M BS17DD385D3 400 m NYSE: GSS 1 TSX: GSC

Wassa Underground: Plan View N F Shoot stopes B Shoot stopes Decline 19500N Inferred Mineral Resource 19300N F Shoot B Shoot expected expected projection projection 19100N 200m 18900N NYSE: GSS 2 TSX: GSC

B Shoot South Drilling: 19500 N W E 19500 N BSDD347 BSDD290BD1 22.6m @ 4.2g/t 25.4m@8.3g/t BSDD290B 19500 N 19.0m@6.9 g/t B Shoot • Two holes, BSDD347 and BSDD351, are existing holes that were re-entered with a diamond drill rig and the holes extended BSDD347 No significant • These two holes were targeting the F Shoot, which was intersections thought to project into the footwall of the B Shoot • Both of these holes intersected dioritic intrusive rocks, BSDD351 where the F Shoot was interpreted to be Assays Pending • Further geological work is needed to determine the geometry of these intrusive bodies NYSE: GSS 3 TSX: GSC

B Shoot South Drilling: 19300 N W E BSDD308D1 13.4m @ 6.0g/t BSDD308M 23.7m @9.6g/t 19300N BS17DD386M 6.4 m @ 3.2 g/t B Shoot 19300 N Drilling on this section was targeting the F Shoot • BSDD295M projection in the footwall of the B shoot zone 26.3m@2.9g/t One new hole, BS17DD386M, and one historic • Planned hole deepened hole, BSDD308M, were drilled ~300 m apart to test the F Shoot structure. Both holes intersected what is interpreted to be the target Additional drilling is planned for 2018 to test between • these two intersections BSDD308M 7.4 m @3.1 g/t NYSE: GSS 4 TSX: GSC

B Shoot South Drilling: 19100N W E 19100N BS17DD387M 6.6 m @ 1.1 g/t BSDD315M 60.1m @ 3.4g/t 19100 N One hole was drilled ~285m up dip of the previous Planned • hole high grade intersection in historic hole BSDD315M Hole BS17DD389M was drilled to test the zone • BSDD315M ~85m above hole BSDD315M – results are pending 70.5m @ 5.9g/t BS17DD389M Assays Pending Two additional daughter holes are planned to test • down dip of hole BSDD315M NYSE: GSS 5 TSX: GSC

B Shoot South Drilling: 18900 N W E 18900N BS17DD386D4 7.7m@5.2g/t BS17DD386D3 5.0m @ 5.5g/t B Shoot BS17DD386D1 18900 N 15.9m @4.3g/t BS17DD386D3 BS17DD386M Five holes drilled on the southern most • 15.0m @ 3.8 g/t 23.8m @6.1g/t 8.1m @ 3.6 g/t step out fence, testing F Shoot 21.7m @ 5.3g/t mineralization BS17DD386D2 Currently drilling is underway to test B • 4.3m@25.9g/t Shoot horizon and F Shoot at depth F Shoot Planned BS17DD386D3 Hole BSDD386D3 intersected widest • holes 94m@4.3 g/t zone of +4 g/t Au mineralization to Currently date on Wassa Property Drilling NYSE: GSS 6 TSX: GSC

242 Section FW N S Wassa Plan View Wassa Underground Planned DD holes WUG Pan 1 Stopes 24217DD006 6.8m @ 8.2g/t Drill Section 8900 WE 242 FW target discovered in 2017 – new footwall horizon • Located in western limb of Wassa deposit scale fold structure • Drilling planned for 2018 to test this zone further • NYSE: GSS 7 TSX: GSC