Golden Star Announces Mineral Reserve and Mineral Resource Update; Wassa Underground Reserves increase 47%

TORONTO, March 28, 2019

Highlights

• Proven and Probable Mineral Reserves increased by 6% to 1.8 million ounces of gold after mined depletion
• Measured and Indicated Mineral Resources stable at 5.9 million ounces of gold
• Inferred Mineral Resources increased by 12% to 7.2 million ounces of gold
• Wassa Underground Mineral Reserve increased by 47% after mined depletion
• Prestea Mineral Reserve decreased by 36% including mined depletion

Sam Coetzer, President and Chief Executive Officer of Golden Star, commented:

"The updated Mineral Reserve at Wassa Underground shows a significant increase, specifically in the upper levels of the mine, and strongly suggests that there is excellent potential to increase our production rate in the near term. In addition, the increase of over 1 million ounces of gold in Inferred Mineral Resources at the Wassa complex to over 6.4 million ounces of gold further demonstrates the potential for the mine. The Company continues to improve its view of the orebody and I am very excited by how Wassa Underground is turning into a world class mine.

"At Prestea, the mine is endowed with good infrastructure and the focus remains on improving operations. The Company continues to address the ramp up challenges with the Alimak shrinkage mining method, and expects steady productivity improvements this year from the mine."

MINERAL RESERVES AND MINERAL RESOURCES SUMMARY

The following table provides a summary of Golden Star's estimated Proven and Probable Mineral Reserves, Measured and Indicated Mineral Resources and Inferred Mineral Resources as of December 31, 2018: