EXHIBIT 99.3

CERTIFICATION

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

I, Ronald W. Thiessen, Chief Executive Officer of Northern Dynasty Minerals Ltd. (the “Company”), hereby 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:

(1)	The Annual Report on Form 40-F of the Company for the fiscal year ended December 31, 2017 (the “Annual Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and
(2)	The information contained in the Annual Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:	/s/ R. Thiessen
Name:	Ronald W. Thiessen
Title:	Chief Executive Officer

Date: March 29, 2018

This written statement is being furnished to the Securities and Exchange Commission as an exhibit to the Company’s Annual Report on Form 20-F. A signed original of this statement has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

This certification accompanies this Annual Report on Form 20-F pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by such Act, be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except to the extent that the Company specifically incorporates it by reference.