Wassa Site Visit | June 5, 2019 CREATING A LEADING AFRICAN NYSE AMERICAN: GSS | TSX: GSC GOLD PRODUCER1 DISCLAIMER SAFE HARBOUR: Some statements contained in this presentation are forward·-looking statements or NON-GAAP FINANCIAL MEASURES: In this presentation, we use the terms "cash operating cost per forward-looking information (collectively, “forward-looking statements”) within the meaning of the United ounce", "All-In Sustaining Cost per ounce" and "AISC per ounce". These terms should be considered as States Private Securities Litigation Reform Act of 1995 and applicable Canadian securities laws. Investors Non-GAAP Financial Measures as defined in applicable Canadian and United States securities laws and are cautioned that forward-looking statements are inherently uncertain and involve risks and uncertainties should not be considered in isolation or as a substitute for measures of performance prepared in that could cause actual results to differ materially. Such statements include comments regarding: accordance with International Financial Reporting Standards ("IFRS"). "Cash operating cost per ounce" for production, cash operating cost, All-in Sustaining Cost and capital expenditure guidance for 2019; ability of a period is equal to the cost of sales excluding depreciation and amortization for the period less royalties, long-term relationship with La Mancha to strengthen balance sheet, unlock organic growth pipeline, fast the cash component of metals inventory net realizable value adjustments and severance charges divided track exploration and expansion programs, focus on increasing production and cash margin per ounce, by the number of ounces of gold sold (excluding pre-commercial production ounces) during the period. and participate in consolidation of African region through seizing external growth opportunities; expected ,"All-In Sustaining Costs per ounce" commences with cash operating costs and then adds sustaining capital use of funds from La Mancha strategic investment towards exploration and timing thereof; and expected expenditures, corporate general and administrative costs, mine site exploratory drilling and greenfield subsequent decrease in cash operating cost per ounce and annual operating costs; expectation of evaluation costs and environmental rehabilitation costs, divided by the number of ounces of gold sold improved efficiency and better integration from bringing Alimak training program in-house; increased (excluding pre-commercial production ounces) during the period. This measure seeks to represent the flexibility of mining sequence from installing of new Alimaks; increased recovery rate for underground total costs of producing gold from operations. These measures are not representative of all cash material following downsizing of processing plant and power consumption; increased Inferred Mineral expenditures as they do not include income tax payments or interest costs. Changes in numerous factors Resources through drilling and timing of announcements regarding such increases; potential of Wassa including, but not limited to, mining rates, milling rates, gold grade, gold recovery, and the costs of labor, South to significantly increase production; achievement of targeted mining rate at Wassa Underground consumables and mine site general and administrative activities can cause these measures to increase or and Prestea Underground and timing thereof; and achievement of milestones in H2 2019 including decrease. We believe that these measures are the same or similar to the measures of other gold mining accelerated exploration of Mineral Resource definition drilling at Wassa and Prestea, accelerated Wassa companies, but may not be comparable to similarly tit led measures in every instance. Please see our Underground development. Factors that could cause actual results to differ materially include timing of "Management's Discussion and Analysis of Financial Condition and Results of Operations for the three and unexpected events at the Prestea and/or the Wassa processing plants; variations in ore grade, tonnes months ended March 31, 2019." for a reconciliation of these Non-GAAP measures to the nearest IFRS mined, crushed or milled; delay or failure to receive board or government approvals and permits; measure. construction delays; the availability and cost of electrical power; timing and availability of external financing on acceptable terms or at all; technical, permitting, mining or processing issues, including INFORMATION: The information contained in this presentation has been obtained by Golden Star from its difficulties in establishing the infrastructure for Wassa Underground or Prestea Underground, inconsistent own records and from other sources deemed reliable, however no representation or warranty is made as power supplies, plant and/or equipment failures and an inability to obtain supplies and materials on to its accuracy or completeness. The technical information relating to Golden Star's material properties reasonable terms (including pricing) or at all; changes in U.S. and Canadian securities markets; heavy disclosed herein is based upon technical reports prepared and filed pursuant to National Instrument 43- rainfall and flooding of underground mines; and fluctuations in gold price and input costs and general 101 - Standards of Disclosure for Mineral Projects ("NI 43-101") and other publicly available information economic conditions. regarding the Company, including the following: (i) "NI 43-101 Technical Report on a Feasibility Study of the Wassa Open Pit Mine and Underground Project in Ghana" effective December 31, 2014; and (ii) "NI Thee can be no assurance that future developments affecting the Company will be those anticipated by 43- 101 Technical Report on Resources and Reserves, Golden Star Resources, Bogoso/ Prestea Gold Mine, management. Please refer to the discussion of these and other factors in our Annual Information Form for Ghana" effective December 31, 2018. Additional information is included in Golden Star's Annual the year ended December 31, 2018 filed and available at www.sedar.com. The forecasts contained in this Information Form for the year ended December 31, 2018 which is filed and available on www.sedar.com. presentation constitute management's current estimates, as of the date of this presentation, with respect Mineral Reserves were prepared under the supervision of Dr. Martin Raffield, Senior Vice President to the matters covered therein. We expect that these estimates will change as new information is received Technical Services for the Company. Dr. Raffield is a "Qualified Person" as defined by NI 43- 101. The and that actual results will vary from these estimates, possibly by material amounts. While we may elect Qualified Person reviewing and validating the estimation of the Mineral Resources is Mitchel Wasel, to update these estimates at any time, we do not undertake to update any estimate at any particular time Golden Star Resources Vice President of Exploration. or in response to any particular event. Investors and others should not assume that any forecasts in this presentation represent management's estimate as of any date other than the date of this presentation. CURRENCY: All monetary amounts refer to United States dollars unless otherwise indicated. NYSE AMERICAN: GSS | TSX: GSC 2 Ventilation Borehole Under Construction WASSA AND HBB LOCATION MAP ▪ The Wassa complex is located near the village of Akyempim in the Wassa East District in the Western Region of Ghana Mampon ▪ 62Km north of the district capital, Daboase, and 40Km east of Bogoso ▪ 80Km north of Cape Coast and 150Km west of the capital Accra ▪ The Wassa/Hwini Butre and Benso concessions (~490Km2) Bogoso Wassa Prestea Benso Hwini Butre NYSE AMERICAN: GSS | TSX: GSC 3 Ventilation Borehole Under Construction WASSA MINE LOCALITY PLAN TSF Process Plant Akyempim Village WUG Portal Wassa Main Pit 419 Dump Phase-1 419 Dump Phase-2 NYSE AMERICAN: GSS | TSX: GSC 4 Ventilation Borehole Under Construction HSEC HIGHLIGHTS Committed to “Duty of Care” We provide a safe working environment, train our people, and supply the needed tools and equipment for every employee to work safely STRATEGIC OBJECTIVES DRIVERS FOCUS ▪ Culture of Zero Harm ▪ Fatality elimination/prevention ▪ Injury reduction ▪ Leaders in health and safety ▪ Employee engagement ▪ Critical tasks analysis performance in the industry ▪ Leadership engagement and effective ▪ Improve incident / near miss / hazard communication reporting ▪ Safety culture and behavioral training ▪ Error traps assessment ▪ Develop working standards ▪ Improve quality of PSI meetings ▪ Emergency response & mine rescue ▪ Safety interactions ▪ House keeping ▪ Quarterly durbars ▪ Leaders demonstrating appropriate behaviors NYSE AMERICAN: GSS | TSX: GSC 5 LEADING INDICATORS Q1 2019 DATA Actual Target Safety meetings 121 152 Hazard awareness training 14 28 Training Take ‘5’ training 15 28 PTO training 4 40 Safety, culture and behavioral based safety training 5 40 Take ‘5’ 22,345 20,968 Work place inspection 4,153 3,888 Planned Task Observation (PTO) 294 228 Risk Management Job Hazard Analysis (JHA) 93 132 Alcohol and drug test conducted 2,886 1,732 Risk assessments 7 28 Safety inspections 73 68 Environmental inspection 35 68 Inspections HOD’s walk the talk 39 64 Safety interactions 159 236 Safety audit with supervisors 38 36 Quarterly mock drills 2 1 Rescue callout practice 12 12 Emergency Preparedness Building evacuation 2 3 Fire extinguisher training conducted 19 12 Near miss