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EXHIBIT 99.15

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CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED
PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

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In connection with the annual report of Fortuna Silver Mines Inc. (the “Company”) on Form 40-F for the fiscal year ended December 31, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Jorge Ganoza Durant, President, Chief Executive Officer & Director of the Company, certify, pursuant to 18 U.S.C. section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

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1.	​	The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

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2. ​ The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

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Dated: March 28, 2024

	​	“Jorge Ganoza Durant”	​	​
​	​	Name:Jorge Ganoza Durant	​	​
​	​	Title: President, Chief Executive Officer & Director
​	​	(principal executive officer)	​	​

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This certification accompanies the Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.