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Northern Dynasty Enters Into Framework Agreement With First Quantum Minerals Option to Acquire 50% Ownership of Pebble Limited Partnership for US $1.5 Billion with Initial Staged Option Payments Totalling U$150 Million over Four Years

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Northern Dynasty Enters Into Framework Agreement With First Quantum Minerals

Option to Acquire 50% Ownership of Pebble Limited Partnership for US $1.5 Billion with

Initial Staged Option Payments Totalling U$150 Million over Four Years

December 18, 2017 Vancouver – Northern Dynasty Minerals Ltd. (TSX: NDM; NYSE MKT: NAK) ("Northern

Dynasty" or the "Company") announced today that it has entered into a framework agreemen t with First

Quantum Minerals Ltd. (“First Quantum”) (TSX: FM) which contemplates that an affiliate of First Quantum

will subsequently execute an option agreement with Northern Dynasty. The option agreement contemplates

an option payment of US$150 million staged over four years which option will entitle First Quantum to

acquire the right to earn a 50% interest in the Pebble Limited Partnership (the “Pebble Partnership”) for

US$1.35 billion. The option period may be extended for up to 2 years by First Quantum making payments to

be agreed upon which amounts will be offset against the $1.35 billion additional investment amount. Within

five business days of the execution of the framework agreement, First Quantum will make an early option

payment of US$37.5 million (“Early Option Price Installment”) to Northern Dynasty. The Early Option Price

Installment will be applied solely for the purpose of progressing the permitting of the Pebble Project.

The entry by First Quantum into the option agreement is contingent upon the completion of due diligence,

necessary regulatory approvals being obtained and the successful negotiation of the final form of the option

agreement and associated commercial agreements. Finalization and execution of the option agreement and

associated commercial agreements is expected early in the second quarter of 2018. Investors are cautioned

there is no assurance that a transaction will be entered into at the end of the process.

“We have made good progress in the partnering process and are ver y pleased to be in advanced -stage

discussions with First Quantum, an industry leader in mine development and management,” Northern

Dynasty President & CEO Ron Thiessen confirmed. “Just as importantly, the immediate capital contribution

from First Quantum will allow Northern Dynasty to execute on its plan to move the Pebble Project forward

to initiate federal and state permitting in the very near-term.”

About First Quantum Minerals Ltd.

First Quantum is a well-established and growing metals and mining company with an industry-leading project

development track record. First Quantum operates seven mines and one copper smelter across six countries

producing mainly copper, gold, nickel and zinc. With a geographically diversified portfolio of tier -one

operations expected to produce approximately 570,000 tonnes of copper in 2017 and the large -scale,

advanced-stage Cobre Panama development project, First Quantum is poised to become one of the largest

widely-held, pure-play copper producers in the world.

About Northern Dynasty Minerals Ltd.

Northern Dynasty is a mineral exploration and development company based in Vancouver, Canada. Northern

Dynasty's principal asset, owned through its wholly -owned Alaska -based US subsidiary P ebble Limited

Partnership and other wholly-owned subsidiaries, is a 100% interest in a contiguous block of 2,402 mineral

claims in southwest Alaska, including the Pebble deposit. The Pebble Partnership is the proponent of the

Pebble Project, an initiative to develop one of the world's most important mineral resources.

For further details on Northern Dynasty and the Pebble Project, please visit the Company's website at

www.northerndynastyminerals.com or contact Investor services at (604) 684-6365 or within North America

at 1-800-667-2114. Review Canadian public filings at www.sedar.com and US public filings at www.sec.gov.

Ronald W. Thiessen

President & CEO

Canadian Media Contact:

Ian Hamilton

DFH Public Affairs

(416) 206-0118 x.222

US Media Contact:

Dan Gagnier

Gagnier Communications

(646) 569-5897

Forward Looking Information and other Cautionary Factors

This release includes certain statements that may be deemed "forward-looking statements". All statements in this release, other than

statements of historical facts, that address exploration drilling, exploitation activities and events or developments that the Company

expects are forward -looking statements. Althoug h the Company believes the expectations expressed in its forward -looking

statements are based on reasonable assumptions, such statements should not be in any way construed as guarantees of the ultimate

size, quality or commercial feasibility of the Pebble Project or of the Company's future performance or the outcome of litigation.

Assumptions used by the Company to develop forward -looking statements include the following: the Pebble Project will obtain all

required environmental and other permits and all la nd use and other licenses, studies and development of the Pebble Project will

continue to be positive, and no geological or technical problems will occur. The likelihood of a partnering transaction is su bject to

risks related to the satisfactory completion of due diligence and negotiations, including finalization of definitive agreements and

fulfilment of conditions precedent therein, including receipt of all necessary approvals. Such process may not be successful ly

completed or completed on terms satisfactory to the Company. The likelihood of future mining at the Pebble Project is subject to a

large number of risks and will require achievement of a number of technical, economic and legal objectives, including obtaini ng

necessary mining and construction per mits, approvals, licenses and title on a timely basis and delays due to third party opposition,

changes in government policies regarding mining and natural resource exploration and exploitation, the final outcome of any

litigation, completion of pre -feasibility and final feasibility studies, preparation of all necessary engineering for surface or

underground mining and processing facilities as well as receipt of significant additional financing to fund these objectives as well as

funding mine construction. Such funding may not be available to the Company on acceptable terms or on any terms at all. There is

no known ore at the Pebble Project and there is no assurance that the mineralization at the Pebble Project will ever be class ified as

ore. The need for co mpliance with extensive environmental and socio -economic rules and practices and the requirement for the

Company to obtain government permitting can cause a delay or even abandonment of a mineral project. The Company is also subject

to the specific risks i nherent in the mining business as well as general economic and business conditions. For more information on

the Company, Investors should review the Company's filings with the United States Securities and Exchange Commission and its home

jurisdiction filings that are available at www.sedar.com