# EDGAR Filing Document

**Accession Number:** 0001164771
**File Stem:** 0001062993-25-013026
**Filing Date:** 2025-7
**Character Count:** 6431
**Document Hash:** 58d8c9e02cf33eac68cf824fff0cb108
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001062993-25-013026.hdr.sgml**: 20250722

**ACCESSION NUMBER**: 0001062993-25-013026

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20250721

**FILED AS OF DATE**: 20250722

**DATE AS OF CHANGE**: 20250722

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NORTHERN DYNASTY MINERALS LTD
- **CENTRAL INDEX KEY:** 0001164771
- **STANDARD INDUSTRIAL CLASSIFICATION:** GOLD & SILVER ORES [1040]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 000000000
- **STATE OF INCORPORATION:** A1
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-32210
- **FILM NUMBER:** 251138991

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 14TH FLOOR
- **STREET 2:** 1040 WEST GEORGIA STREET
- **CITY:** VANCOUVER
- **PROVINCE COUNTRY:** A1
- **ZIP:** V6E 4H8
- **BUSINESS PHONE:** 604-684-6365

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 14TH FLOOR
- **STREET 2:** 1040 WEST GEORGIA STREET
- **CITY:** VANCOUVER
- **PROVINCE COUNTRY:** A1
- **ZIP:** V6E 4H8

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**UNITED STATES**<br>**SECURITIES AND EXCHANGE COMMISSION**<br>**Washington, D.C. 20549**

**FORM 6-K**

**REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934**

For the month of <u>**July 2025**</u>

Commission File No. <u>**001-32210**</u>

<u>**NORTHERN DYNASTY MINERALS LTD.**</u><br>(Translation of registrant's name into English)

**14<sup>th</sup>** **Floor - 1040 West Georgia Street**<br><u>**Vancouver, British Columbia, V6E 4H1, Canada**</u><br>(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F

Form 20-F **[ ] Form 40-F [X]**

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1) [ ]

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7) [ ]

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**EXHIBIT INDEX**

Exhibit 99.1 is hereby incorporated by reference into the Company's registration statement on Form F-10, as amended (SEC File No. 333-288224) and related prospectus supplement filed July 15, 2025.

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| | |
|:---|:---|
| &nbsp;&nbsp; <u>**Exhibits**</u> |  |
| [99.1](exhibit99-1.htm) | [Material Change Report re Motion for Summary Judgement Filed in Federal District Court in Alaska](exhibit99-1.htm) |

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**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: July 21, 2025

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| |
|:---|
| **NORTHERN DYNASTY MINERALS LTD.**<br>(Registrant) |
| /s/ *Trevor Thomas* |
| Trevor Thomas<br>Secretary and General Counsel |

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## Exhibit 99.1

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**FORM 51-102F3**

**MATERIAL CHANGE REPORT**

**Item 1 Name and Address of Company**

Northern Dynasty Minerals Ltd. (the "**Company**")<br>14th Floor - 1040 West Georgia Street<br>Vancouver, British Columbia<br>V6E 4H1

**Item 2 Date of Material Change**

July 17, 2025

**Item 3 News Release**

The news release with respect to the material changes referred to in this report was issued by the Company and distributed through the facilities of IssuerDirect/Acccesswire on July 17, 2025. The news release was filed on SEDAR+ and is available at <u>www.sedarplus.ca</u>.

**Item 4 Summary of Material Change**

Pebble Limited Partnership ("**PLP**"), the Company's 100% owned U.S.-based subsidiary and the owner of the Company's Pebble Project, filed a motion in the United States Federal District Court in Alaska on July 17, 2025 seeking a summary judgment briefing schedule in its pending litigation against the United States Environment Protection Agency (the "**EPA**").

**Item 5 Full Description of Material Change**

**5.1 Full Description of Material Change**

PLP filed a motion in the United States Federal District Court (the "**Court**") in Alaska on July 17, 2025 seeking a summary judgment briefing schedule in its pending litigation against the EPA that seeks to vacate the EPA's final determination to veto the development of a mine at the Company's Pebble Project. The Pebble Project and the related litigation against the EPA and the United States Army Corps of Engineers ("**USACE**") is described in detail in the Company's annual information form for the year ended December 31, 2024, as filed on SEDAR+, and incorporated as an exhibit to the Company's annual report on Form 40-F for the year ended December 31, 2024, as filed with the United States Securities and Exchange Commission on EDGAR.

In February 2025, the Company announced that PLP had consented to a motion from the EPA and USACE to hold the litigation in abeyance for 90 days to allow for leadership of the two agencies under the new U.S. administration to decide how to proceed. PLP consented to a subsequent 30 day abeyance in May 2025 and a further 20 day abeyance in June 2025. The EPA and PLP agreed to a further abeyance of 14 days with a status report to follow on July 17, 2025.

The abeyance was designed to allow the EPA and the USACE to brief new agency leadership and determine if they wished to take a different position. In the intervening six months, the parties conferred in good faith as new agency leadership was brought on and familiarized themselves with the case. Discussions with the new agency leadership were productive but the parties were unable to reach a negotiated resolution by July 17, 2025. As a result, PLP has filed a motion asking the Court to set a briefing schedule for summary judgment motions in the proceedings against the EPA. The Company and PLP plan to continue to work with the relevant government agencies to resolve the disputed issues. Meanwhile, the Company continues to assert its position that the veto imposed by the EPA is unlawful.

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**5.2 Disclosure for Restructuring Transactions**

Not applicable.

**Item 6 Reliance on subsection 7.1(2) of National Instrument 51-102**

Not applicable.

**Item 7 Omitted Information**

Not applicable.

**Item 8 Executive Officer**

Ronald W. Thiessen<br>President & CEO<br>Tel: 604-684-6365

**Item 9 Date of Report**

July 21, 2025

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